The pontine flexure is located between these two flexures. Isthmic organizer at the midbrain-hindbrain boundary.
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Reticular pigmented anomaly of the flexures (also known as "dark dot disease", and "Dowling–Degos' disease") is a fibrous anomaly of the flexures or bending parts of the axillae, neck and inframammary/sternal areas.James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. .
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Wende–Bauckus syndrome is a cutaneous condition characterized by tiny white macules on the trunk with confluence within flexures.
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Flexures are a design feature utilized by design engineers (usually mechanical engineers) for providing adjustment or compliance in a design.
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It also bends dorsally into the pontine flexure. These flexures have formed by the time that the primary brain vesicles have developed into five secondary brain vesicles in the fifth week.
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Three flexures form in the part of the embryonic neural tube that develops into the brain. At four weeks gestational age in the human embryo the neural tube has developed at the cranial end into three swellings – the primary brain vesicles. The space into which the cranial part of the neural tube is developing is limited. This limitation causes the neural tube to bend, or flex, at two ventral flexures – the rostral cephalic flexure, and the caudal cervical flexure.
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This makes flexures a critical design feature used in optical instrumentation such as interferometers. Due to their mode of action, flexures are used for limited range motions and cannot replace long-travel or continuous-rotation adjustments. Additionally, special care must be taken to design the flexure to avoid material yielding or fatigue, both of which are potential failure modes in a flexure design. A leaf spring suspension is an example of a flexure design in automotive engineering.
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Drive wheel from the Mars Exploration Rovers, with integral suspension flexures. Each rover has six wheels mounted on a rocker- bogie suspension system that ensures wheels remain on the ground while driving over rough terrain. The design reduces the range of motion of the rover body by half, and allows the rover to go over obstacles or through holes that are more than a wheel diameter () in size. The rover wheels are designed with integral compliant flexures which provide shock absorption during movement.
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In the field of precision engineering (especially high- precision motion control), flexures have several key advantages. High precision alignment tasks might not be possible when friction or stiction are present. Additionally, conventional bearings or linear slides often exhibit positioning hysteresis due to backlash and friction. Flexures are able to achieve much lower resolution limits (in some cases measured in the nanometer scale), because they depend on bending and/or torsion of flexible elements, rather than surface interaction of many parts (as with a ball bearing).
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This causes the neural tube to bend ventrally at two flexures – the first at the cephalic flexure and the second at the cervical flexure. A third flexure is oriented in the opposite dorsal direction as the pontine flexure. By the fifth week further flexion has taken place and the five secondary brain vesicles have formed. The angle formed by the two ventral flexures, the cephalic flexure and the cervical flexure together, is a right angle in the ventral direction between the axis of the body and the axis of the brain.
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There are two colic flexures, or curvatures in the transverse colon. The one on the right, the right colic flexure is known as the hepatic flexure. The one on the left, the left colic flexure is known as the splenic flexure.
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The thickest mineralized zones invariably occur at depressions or flexures in the granitic contact. Shallow ore is mainly autunite. Deeper ore is pitchblende and coffinite with abundant pyrite and marcasite. Uranium minerals occur disseminated along foliation, as replacements and stockwork fracture-fillings.
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Elastomeric bearings are constructed from a rubber type material and provide limited movement that is perfectly suited for helicopter applications. Flexures and elastomeric bearings require no lubrication and, therefore, require less maintenance. They also absorb vibration, which means less fatigue and longer service life for the helicopter components.
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Many of the boundaries are thrust or reverse faults. Although other boundaries appear to be monoclinal flexures, faulting is suspected at depth. Most bounding faults show evidence of at least two episodes of Laramide (Late Cretaceous and Eocene) movement, suggesting both thrust and strike-slip types of displacement.
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The initial prototypes of the MFI weighed 100 milligrams and had wingspans of 2 centimeters. They were structured with stainless steel beams and polymer flexures as joints. This created a weight-to-lift ratio that led to an issue with achieving flight. The beams and joints were then changed to lighter materials that perform better.
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Alotza meadows and Aizkorri in the background The range is mountainous with large limestone massifs (formations resulting from movement of the earth's crust into faults and flexures). This is typical of the Basque region. The range has a karstic lithological appearance, i.e. parts of the calcareous (calcium carbonate, limestone) rock outcrops have been dissolved away in water.
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In the Mesozoic, the Anatolian and Iranian plates fully separated and the Neo-Tethys Ocean opened. The Mesopotamian Zone (also known as the Mesopotamian Foredeep) and central Iraq had particularly thick sedimentary sequences. North-south axes are common in flexures in these rocks. In the Zone of Foreland Folding, rocks show signs of turbdiite and submarine fan deposits.
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The name Tamu is taken from the initials of Texas A&M; University, where William Sager, a geology professor at the University of Houston and one of the lead scientists studying the volcano, previously taught. Massif, which means "massive" in French, is a large mountain or a section of the planet's crust that is demarcated by faults and flexures.
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A flexure bearing is a category of flexure which is engineered to be compliant in one or more angular degrees of freedom. Flexure bearings are often part of compliant mechanisms. Flexure bearings serve much of the same function as conventional bearings or hinges in applications which require angular compliance. However, flexures require no lubrication and exhibit very low or no friction.
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Modern rotor systems may use the combined principles of the rotor systems mentioned above. Some rotor hubs incorporate a flexible hub, which allows for blade bending (flexing) without the need for bearings or hinges. These systems, called "flexures",FAA Flight Standards Service 2001 are usually constructed from composite material. Elastomeric bearings may also be used in place of conventional roller bearings.
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The transverse mesocolon is that section of the mesocolon attached to the transverse colon that lies between the colic flexures. The sigmoid mesocolon is that region of the mesentery to which the sigmoid colon is attached at the gastrointestinal mesenteric margin. The mesoappendix is the portion of the mesocolon connecting the ileum to the appendix. It may extend to the tip of the appendix.
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There is a very close spatial association with the granite, the skarn occurs only within marble which is known to be a very reactive rock type, and the skarn has a chemical composition that is unlike any known igneous or sedimentary rock type. Furthermore, various structures such as flexures in the contact or impermeable hornfels beds affected the distribution and ore grade of the skarn zones.
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In the Cenozoic, the marine transgression continued, extending to the Tibesti area by the Early Eocene. The subsidence remained irregular, creating different blocks of rock. This process became more complicated, as fault troughs formed in the Oligocene due to tectonic stretching of the African block and continued into Miocene, Pliocene and Quaternary. The current boundaries of the Gulf of Sirte are the result of Pliocene and Quaternary flexures in the rock.
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The mesocolic lymph nodes are numerous, and lie between the layers of the transverse mesocolon, in close relation to the transverse colon; they are best developed in the neighborhood of the right and left colic flexures. One or two small glands are occasionally seen along the trunk of the right colic artery and others are found in relation to the trunk and branches of the middle colic artery.
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The neuraxis or sometimes neuroaxis is the axis of the central nervous system. It denotes the direction in which the central nervous system lies. During embryological development, the neuraxis is bent by various flexures, contributing to the mature structure of the brain and spinal cord. Embryonic development can help in understanding the structure of the adult brain because it establishes a framework on which more complex structures can be built.
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Beyond this region of intense Petermann-aged activity, deformation related to the Petermann Orogen is less pervasive and ductile. Sedimentation associated with the Petermann Orogeny is responsible for the deposition of the Georgina Basin, Officer Basin, Ngalia Basin and Amadeus Basin sediments in the Cambrian. Sediments are a mixture of fluvial conglomerates, sandstones, and siltstones. Several pull-apart structural grabens formed at flexures in the orogenic belt, forming the Levenger and Moorilyanna Grabens.
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This has proven to be difficult for quasi-static scanners, although there are promising approaches in the literature using long meandering flexures for deflection amplification. For resonant rotational scanners, on the other hand, scanners using piezo-electric actuation combined with an indirect drive are the highest performer in terms of scan angle and working frequency. However, the technology is newer than electro-static and electro-magnetic drives and remains to be implemented in commercial products.
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Economically important coal seams in the Mist Mountain Formation reach a maximum thickness of . Seams occur throughout the formation, and some of the seams near the base for the formation are regionally extensive. The formation was strongly folded and faulted during the Laramide Orogeny, which brought the coal to surface in many places. This also produced localized thickening and thinning of the coal in some areas due to shearing and fault-repetition of the seams, especially in the cores of folds and flexures.
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It was also shown that a mesenteric confluence occurs at the ileocaecal and rectosigmoid junctions, as well as at the hepatic and splenic flexures and that each confluence involves peritoneal and omental attachments. The proximal rectum was shown to originate at the confluence of the mesorectum and mesosigmoid. A plane occupied by perinephric fascia was shown to separate the entire apposed small intestinal mesentery and the mesocolon from the retroperitoneum. Deep in the pelvis, this fascia coalesces to give rise to presacral fascia.
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Coghill studied Ambystoma tigrinum (the tiger salamander), to investigate the relationship between the development of behavior and the development of the nervous system. When observing the development of movement in Ambystoma tigrinum, Coghill noticed that the first observable movements were in the trunk of the Ambystoma embryos. These movements developed over time from unspecific, sometimes spontaneous, myogenic motions to unilateral flexures to concerted motions that resembled swimming. Coghill hypothesized that this movement was the precursor to later feeding behavior or walking behavior.
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A six-DOF NSM isolator typically uses three isolators stacked in series: a tilt-motion isolator on top of a horizontal-motion isolator on top of a vertical-motion isolator. Figure 3 shows a schematic of a vibration isolation system consisting of a weighted platform supported by a single six-DOF isolator incorporating the isolators of Figures 1 and 2. Flexures are used in place of the hinged bars shown in Figure 1. A tilt flexure serves as the tilt-motion isolator.
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It implies that the planes of the brain are not necessarily the same as those of the body. However, the situation is more complex, since comparative embryology shows that the length axis of the neural tube (the primordium of the brain) has three internal bending points, namely two ventral bendings at the cervical and cephalic flexures (cervical flexure roughly between the medulla oblongata and the spinal cord, and cephalic flexure between the diencephalon and the midbrain), and a dorsal (pontine or rhombic flexure) at the midst of the hindbrain, behind the cerebellum. The latter flexure mainly appears in mammals and sauropsids (reptiles and birds), whereas the other two, and principally the cephalic flexure, appear in all vertebrates (the sum of the cervical and cephalic ventral flexures is the cause of the 90 degree angle mentioned above in humans between body axis and brain axis). This more realistic concept of the longitudinal structure of vertebrate brains implies that any section plane, except the sagittal plane, will intersect variably different parts of the same brain as the section series proceeds across it (relativity of actual sections with regard to topological morphological status in the ideal unbent neural tube).
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Galli–Galli disease is a rare inherited condition that has close resemblance clinically to Dowling-Degos' disease, but is histologically distinct, characterized by skin lesions that are 1- to 2-mm slightly keratotic red to dark brown papules which are focally confluent in a reticulate pattern.James, William; Berger, Timothy; Elston, Dirk Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. . The disease is also characterized by slowly progressive and disfiguring reticulate hyperpigmentation of the flexures, clinically and histopathologically diagnostic for Dowling-Degos disease but also associated with suprabasal, nondyskeratotic acantholysis.
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The large colon, small colon, and rectum make up the remainder of the large intestine. The large colon is long and holds up to of semi-liquid matter. It is made up of the right ventral (lower) colon, the left ventral colon, the left dorsal (upper) colon, the right dorsal colon, and the transverse colon, in that order. Three flexures are also named; the sternal flexure, between right and left ventral colon; the pelvic flexure, between left ventral and left dorsal colon; the diaphragmatic flexure, between left dorsal and right dorsal colon.
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This fold is divided during lateral to medial mobilization, permitting the surgeon to serially lift the right colon and associated mesentery off the underlying fascia and retroperitoneum. At the hepatic flexure, the right lateral peritoneal fold turns and continues medially as the hepatocolic peritoneal fold. Division of the fold in this location permits separation of the colonic component of the hepatic flexure and mesocolon off the retroperitoneum. Interposed between the hepatic and splenic flexures, the greater omentum adheres to the transverse colon along a further band or fold of peritoneum.
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Sudan experienced extensive pediplanation, a form of sheet flow erosion that scours away overlying sediments, leaving a gently inclined bedrock surface. Because of this, the country has hardly any unmetamorphosed rocks from the Paleozoic or early Mesozoic, with the exception of a few 530 million year old Early Cambrian rocks at Sabaloka. Structural geologists believe that the Red Sea depression is not bounded by faults. Rather, it formed beginning in the Carboniferous as a subsidence zone and continued to develop in the Mesozoic as a depression between monocline flexures approximately marking the present African and Arabian coasts of the sea.
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By the second half of the 20th century, the accurate measurement of star positions from the ground was running into essentially insurmountable barriers to improvements in accuracy, especially for large-angle measurements and systematic terms. Problems were dominated by the effects of the Earth's atmosphere, but were compounded by complex optical terms, thermal and gravitational instrument flexures, and the absence of all- sky visibility. A formal proposal to make these exacting observations from space was first put forward in 1967. Although originally proposed to the French space agency CNES, it was considered too complex and expensive for a single national programme.
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This relative thickness may be why compressional forces from the orogeny were mostly transmitted through the province instead of deforming it. Pre-existing weaknesses in Precambrian rocks were exploited and reactivated by the compression. It was along these ancient faults and other deeply buried structures that much of the province's relatively small and gently inclined flexures (such as anticlines, synclines, and monoclines) formed. Some of the prominent isolated mountain ranges of the Plateau, such as Ute Mountain and the Carrizo Mountains, both near the Four Corners, are cored by igneous rocks that were emplaced about 70 million years ago.
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Joint valley landscape seen in wintertime Stockholm archipelago. The reason on how the lowlands reached its sunken position relative to other parts of Sweden is not clear. Possibly its boundaries are flexures in Earth's crust rather, the possibility of geological faults forming its boundaries is ruled out as none of them have been found.. Much of the Sub-Cambrian peneplain, that is otherways common in eastern Sweden, is preserved on the Central Swedish lowland. The relief of the region is contain various areas of joint valley terrain (), this means that the landscape is dissected by valleys following joints, faults and other weakness zones in the Precambrian shield rocks.
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Volvulus of the large colon usually occurs where the mesentery attaches to the body wall, but may also occur at the diaphragmatic or sternal flexures, with rotations up to 720 degrees reported. It is most commonly seen in postpartum mares, usually presents with severe signs of colic that are refractory to analgesic administration, and horses often lie in dorsal recumbency. Abdominal distention is common due to strangulation and rapid engorgement of the intestine with gas, which then can lead to dyspnea as the growing bowel pushes against the diaphragm and prevents normal ventilation. Additionally, compression can place pressure on the caudal vena cava, leading to pooling of blood and hypovolemia.
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Brain and the central nervous system are the two most important components of the fetus. Further analysis by this same group involved the CNS up to the medulla at 2nd cervical vertebral level. The process of analyzing the fetal brain and the CNS involved dissecting out the whole brain tissue followed by decantation of an 8.5 weeks old fetal brain weighing 15 grams. The brain at this time had already assumed the appearance of primary divisions and flexures, and the prosen, messen and rhombocephalon already gave rise to the different brain- derived constituents like rhinocephalon, corporastriata, cerebral cortex, hypo and epithalamus and pons medulla to a less differentiation extent.
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The layers of a rigid flex are also normally electrically interconnected by means of plated through holes. Over the years, rigid-flex circuits have enjoyed tremendous popularity among military product designer, however the technology has found increased use in commercial products. While often considered a specialty product for low volume applications because of the challenges, an impressive effort to use the technology was made by Compaq computer in the production of boards for a laptop computer in the 1990s. While the computer's main rigid- flex PCBA did not flex during use, subsequent designs by Compaq utilized rigid-flex circuits for the hinged display cable, passing tens of thousands of flexures during testing.
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