Floor Of Fourth Ventricle Contains Which Nucleus

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. 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. Medial eminence show an elevation called facial colliculus produced by the fibers of facial nerve which form a loop around the dorsal aspect of abducent nucleus.

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The obex is also a.

Floor of fourth ventricle contains which nucleus.

A and b only are correct. The fourth ventricle has an anterior ventral floor with a characteristic diamond shape named the rhomboid fossa and a posterior dorsal tent shaped roof. This nucleus lies in the lower part of the pons deep to the facial colliculus in the floor of the fourth ventricle. Melanin granules inside the neurons of the lc contribute to its blue colour.

The locus coeruleus lc is located in the posterior area of the rostral pons in the lateral floor of the fourth ventricle it is composed of mostly medium size neurons. All of the above are correct. These nuclei are present in the floor of the 4th ventricle except. Specifically it spans from the obex an area in the medulla.

It has a diamond shape and is located in the upper portion of the medulla. In the pontine part of floor of fourth ventricle following features are seen. The caudal tip of the fourth ventricle where it becomes the central canal is known as the obex. The abducent nucleus is a motor nucleus and sends its attached nerve to supply the lateral rectus muscle.

Facial nucleus in the facial colliculus. Each half is further subdivided by sulcus limitans into a medial area called medial eminence and lateral vestibular area. 10 3 is formed by the pons and medulla fig. All of the following are.

Thus it is also known as the nucleus pigmentosus pontis meaning heavily pigmented nucleus of the pons. A tumor or other lesion on one side of the floor of the fourth ventricle may induce symptoms related to. Contains a nucleus that is part of the limbic system. Csf produced and or flowing into the fourth ventricle can exit to the subarachnoid space through lateral apertures and a single median aperture located in the inferiorportion of the roof.

On every side the 4th ventricle is limted inferiolaterally by the inferior cerebellar peduncle sup plemented by gracile and cuneate tubercles and superolaterally by the superior cerebellar peduncle. It is situated in the grey matter lining the floor of the fourth ventricle near the midline. Dorsal motor nucleus of the vagus. The facial colliculus is an elevation on the floor of the fourth ventricle in the pons under which is located the abducens nucleus cranial nerve vi and the axons of the facial nerve nucleus vii which arc around the abducens nucleus.

The bounds of the 4th ventricle contain sidelong boundaries a roof and a floor lateral bounds lateral walls. The floor of the fourth ventricle the rhomboid fossa see fig. The fourth ventricle contains cerebrospinal fluid.