Pons

 

The pons is found only mammals and it seems to be responsible for learned coordination and balance as opposed to unlearned coordination which are basically instinctual.  The coordination which the pons helps to integrate are from the learned areas of the cerebral cortex. The tract runs from the cerebral cortex down to the cerebellum with synapses in the pons. The tract begins as the corticopontine tracts which then proceeds to the deep cerebellar nuclei. All the lobes of the cerebral cortex contribute to this. They include

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Frontopontine

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Temporopontine

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Occipitopontine

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Parietopontine

The whole tract beginning from the cortex and ending in the cerebellum after relaying in the pons may then be called corticopontocerebellar tract and they relay in the ventral aspect of the pons in the basis pontis.

Pons is therefore divided into the following parts

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Basis pontis ( most ventral)

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Pontine tegmentum which contains nuclear groups of cranial nerves V, VI, VII . It also contains the reticular formation of the pons.

 The most dorsal part of the pons is the fourth ventricle. The floor, which is part of the so-called rhomboid fossa because it is pyramidal in shape, contains the following structures

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Facial colliculus, this is the swelling which has the abducent nucleus and also the internal genu of the facial nerve.

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It also has the rostral extreme of the tuberculum acousticum. It is separated from the back of the medulla by striae medullaris.


Rhomboid fossa (Posterior)

 

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Ventral brainstem

 

 
Brainstem Medulla Pons Midbrain Thalamus Epithalamus
Basal ganglia Forebrain Temporal lobe Cerebral operculum Remove operculum Wall of lateral ventricle 1
Wall of lateral ventricle 2 Wall of lateral ventricle 3 lateral ventricle 1 lateral ventricle 2 Base of brain Rhomboid fossa

 

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