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The fibers originate from the ipsilateral abducens nucleus which is located in the caudal pons beneath the floor of the fourth ventricle fig.
Cranial nerve nuclei in floor of 4th ventricle. Medial to this nucleus are two bundles of fibers. The 4th ventricle is a tent like cavity of the hindbrain lined with ependyma and filled up with cerebrospinal fluid csf it s situated in the posterior cranial fossa in front of the cerebellum and behind the pons and the upper part of medulla oblongata the cavity of the ventricle seems rhomboidal lozenge shaped in the horizontal section and presents a triangular outline in the sagittal. The only naturally occurring openings between the ventricles of the brain and the subarachnoid space surrounding the brain are the foramina of luschka and magendie in the fourth ventricle. On the model this is the fourth ventricle this is the floor.
The floor of the fourth ventricle the rhomboid fossa see fig. Surgical treatment of brainstem lesions carries a substantial risk of postoperative morbidity because of the risk of injuring the tightly packed cranial nerve nuclei cnn and neural tracts within the rhomboid fossa and brainstem lang et al 1991 historically neurosurgeons considered this area to be a no man s land with most lesions being inoperable baker 1965. Cranial nerve vi the abducens nerve supplies the lateral rectus which abducts the eye hence the name of the nerve. Learn everything about the cranial nerve nuclei and brainstem topography with our videos quizzes articles and labeled diagrams.
The back of the upper part of the medulla forms the floor of the fourth ventricle. The fourth ventricle has a roof at its upper posterior surface and a floor at its lower anterior surface and side walls formed by the cerebellar peduncles nerve bundles joining the structure on the posterior side of the ventricle to the structures on the anterior side. Most of the cranial nerve nuclei that migrated from their original position in relation to the floor of fourth ventricle during embryonic development are situated in this grey matter region central grey matter. The dorsal aspect of the medulla faces almost directly backwards.
The medulla the pons and the midbrain are located just behind the basilar part of the occipital bone and the dorsum sellae. 10 3 is formed by the pons and medulla fig. A cranial nerve nucleus is a collection of neurons gray matter in the brain stem that is associated with one or more cranial nerves. View chapter purchase book.
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