Pons

The pons is the middle of the three parts of the brainstem, sitting above the medulla and below the midbrain. It acts as a relay between the cerebellum and cerebral hemispheres. 

Gross anatomy

The pons has a bulbous shape and has two main components - the ventral pons and the dorsal tegmentum.

The ventral (or anterior) pons consists of white matter tracts (e.g. anterior and lateral corticospinal, corticobulbar and corticopontine tracts) with transverse fibres contributing to the bulk of the pons.

The dorsal tegmentum is continuous with the tegmentum of the medulla and the midbrain. It contains multiple white matter tracts (e.g. medial longitudinal fasciculus, medial lemniscus, lateral lemniscus, etc) and gray matter nuclei (e.g. cranial nerves). Within the dorsal tegmentum lie four cranial nerve nuclei:

Posteriorly, the pons is connected to the cerebellum by the middle cerebellar peduncle. 

Relations

Blood supply

Primarily by vertebrobasilar circulation:

Neuroanatomy
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Article Information

rID: 5801
Section: Anatomy
Synonyms or Alternate Spellings:
  • The pons

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Cases and Figures

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    Case 1: the pons with a left sided infarct
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    Case 2: the pons with a right sided infarct
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