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The pons has been arbitrarily divided into the dorsal or posterior tegmentum and a basal or anterior part sometimes referred to as the pons proper.
Pons transverse section. The transverse section of pons is studied at two levels. Transverse section of pons. The pons is also called the pons varolii bridge of varolius after the italian anatomist and surgeon costanzo varolio 1543 75.
The grey matter at this level consists of. The subdivision of the pons into dorsal and ventral parts and its relationship to the superior middle and inferior cerebellar peduncles has been noted. The pons metencephalon lies beneath anterior to the cerebellum and is around 2 6 cm in length.
Transverse section via the upper part of the pons goes through the trigeminal nuclei. Similary we will use the analogy of an inverted face of a human to draw the cross section of pons. The motor nucleus of trigeminal nerve situated in the dorsolateral part underneath the lateral part of the 4th ventricle.
Some features common to both these levels have been already considered fig. The pons latin for bridge is part of the brainstem and in humans and other bipeds lies inferior to the midbrain superior to the medulla oblongata and anterior to the cerebellum. The cavity of pons is formed by the fourth ventricle present in the posterior part.
Cerebral aqueduct lies in midbrain and 4th ventricle lies in pons. Earlier we imagined transverse section of the midbrain as an inverted striped face of red eyed demon. The pons transverse sections through the lower and upper parts of the pons are illustrated in figs.
It is sharply demarcated from the medulla caudally and the midbrain rostrally figure 1 left. The tegmentum at this level presents these features. It appears as a pear shaped structure with pontine fibers running transversely in the anterior part.
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