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Anterior external arcuate fibers
Identifiers
NeuroLex ID
birnlex_1628
Anatomical terms of neuroanatomy
[edit on Wikidata]
Anterior external arcuate fibers
Diagram showing the course of the arcuate fibers. (Testut.) 1. Medulla oblongata anterior surface. 2. Anterior median fissure. 3. Fourth ventricle. 4. Inferior olivary nucleus, with the accessory olivary nuclei. 5. Gracile nucleus. 6. Cuneate nucleus. 7. Trigeminal. 8. Inferior peduncles, seen from in front. 9. Posterior external arcuate fibers. 10. Anterior external arcuate fibers. 11. Internal arcuate fibers. 12. Peduncle of inferior olivary nucleus. 13. Nucleus arcuatus. 14. Vagus. 15. Hypoglossal.
Section of the medulla oblongata at about the middle of the olive. (Arcuate fibers labeled at center right.)
Details
Identifiers
Latin
fibrae arcuatae externae anteriores
NeuroLex ID
birnlex_1628
Anatomical terminology
[edit on Wikidata]
The anterior external arcuate fibers (ventral external arcuate fibers) vary as to their prominence: in some cases they form an almost continuous layer covering the medullary pyramids and olivary body, while in other cases they are barely visible on the surface.
Most of them reach the surface by way of the anterior median fissure, and arch backward over the pyramid.
Reinforced by others which emerge between the pyramid and olive, they pass backward over the olive and lateral district of the medulla oblongata, and enter the inferior peduncle.
As the fibers arch across the pyramid, they enclose a small nucleus which lies in front of and medial to the pyramid.
This is named the arcuate nucleus, and is serially continuous above with the pontine nuclei in the pons; it contains small fusiform (spindle-shaped) cells, around which some of the arcuate fibers end, and from which others arise.
and 29 Related for: Anterior external arcuate fibers information
Externalarcuatefibers may refer to: Anteriorexternalarcuatefibers Posterior externalarcuatefibers This disambiguation page lists articles associated...
the superior cerebellar peduncle. The posterior externalarcuatefibers (dorsal externalarcuatefibers or cuneocerebellar tract) take origin in the accessory...
In neuroanatomy, the internal arcuatefibers or internal arcuate tract are the axons of second-order sensory neurons that compose the gracile and cuneate...
laterally across the surface of the pons are known as the anteriorexternalarcuatefibers. The region between the anterolateral and posterolateral sulcus...
fibers that cross obliquely from one side to the other, and constitute the pyramidal decussation. Some fibers, termed the anteriorexternalarcuate fibers...
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comprises both sensory and motor fibers. The sensory fibers originate from neurons of the nodose ganglion, whereas the motor fibers come from neurons of the dorsal...
attached: External anal sphincter Bulbospongiosus muscle Superficial transverse perineal muscle Anteriorfibers of the levator ani Fibers from male or...
examination two surfaces—an external and an internal—a crest, and two borders—an anterior and a posterior. The external surface, known as the dorsum...
depression to which the roots of the facial nerve are attached. The externalarcuatefibers wind across the lower part of the pyramid and olive and enter the...
principally to the cartilage of the fifth rib, usually has some fibers of insertion into the anterior extremity of the rib itself. It is typically around 10 mm...
disrupt the arcuate fasciculus. Functional imaging studies on the cerebral correlates of language production also suggest that the anterior insula forms...
solid organs. Abdominal external oblique muscle – The largest, and outermost, of the three flat muscles of the lateral anterior abdominal wall. Abdominal...
collagen fibers containing cartilage-like cells. Strong fibers run along the menisci from one attachment to the other, while weaker radial fibers are interlaced...
fascia, which surround the psoas major muscle as it passes under the medial arcuate ligament. Together with the iliac fascia, it continues down to the inguinal...
The lateral arcuate ligament arises from the transverse process of L1 vertebrae and is attached laterally to the 12th rib. The lateral arcuate ligament also...
further dysfunction and prolapse later in life. The urethra is part of the anterior wall of the vagina and damage to the support structures there can lead...
enters the pelvis between the transverse ligament of the pelvis and the arcuate pubic ligament; on either side near its termination are the bulbourethral...
the external and internal medullary laminae. The external lamina covers the lateral surface and the internal lamina divides the nuclei into anterior, medial...
and minimus arise on the external surface of the ilium and are both inserted into the greater trochanter. Their anteriorfibers are medial rotators and...
the restiform body and anterior spinocerebellar tract. It receives input from the ipsilateral posterior externalarcuatefibers (cuneocerebellar tract)...
with de-inhibition of the pulse generator in the arcuate nucleus. This inhibition of the arcuate nucleus is an ongoing active suppression by other areas...
that surrounds and protects the glans of the clitoris; it also covers the external clitoral shaft, develops as part of the labia minora and is homologous...
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