Floor Of Fourth Ventricle Contains Which Nucleus

The bounds of the 4th ventricle contain sidelong boundaries a roof and a floor lateral bounds lateral walls.

Floor of fourth ventricle contains which nucleus. In the pontine part of floor of fourth ventricle following features are seen. Thus it is also known as the nucleus pigmentosus pontis meaning heavily pigmented nucleus of the pons. Melanin granules inside the neurons of the lc contribute to its blue colour. 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.

A tumor or other lesion on one side of the floor of the fourth ventricle may induce symptoms related to. Specifically it spans from the obex an area in the medulla. A and b only are correct. It has a diamond shape and is located in the upper portion of the medulla.

The fourth ventricle contains cerebrospinal fluid. It is situated in the grey matter lining the floor of the fourth ventricle near the midline. 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. Contains a nucleus that is part of the limbic system.

The abducent nucleus is a motor nucleus and sends its attached nerve to supply the lateral rectus muscle. 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. These nuclei are present in the floor of the 4th ventricle except.

10 3 is formed by the pons and medulla fig. All of the following are. 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. The floor of the fourth ventricle the rhomboid fossa see fig.

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. The caudal tip of the fourth ventricle where it becomes the central canal is known as the obex. 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. Each half is further subdivided by sulcus limitans into a medial area called medial eminence and lateral vestibular area.

The obex is also a. Facial nucleus in the facial colliculus. Dorsal motor nucleus of the vagus.