Anatomy: Posterior Fossa, Hindbrain & Craniocervical Junction
Pons
The pons is the middle part of the brainstem, relaying signals and contributing to functions that can be affected in severe Chiari malformations.
In short: Pons
- It is the middle part of the brainstem, above the medulla.
- It relays signals between brain regions and helps control breathing.
- It can be involved in the displacement of severe Chiari types.
- Its functions include aspects of facial movement, hearing, and balance.
What it is
The pons is the middle portion of the brainstem, located above the medulla and below the midbrain. It serves as a relay between different parts of the brain and contributes to functions including breathing, facial movement and sensation, hearing, and balance. It can be involved in the more severe Chiari malformations.
Understanding Pons
The pons contains pathways connecting the cerebrum, cerebellum, and lower brainstem, and houses centers and cranial nerve nuclei involved in functions such as facial movement, eye movement, hearing, balance, and aspects of breathing. In severe Chiari malformations (such as type II), the brainstem — potentially including the pons — is displaced downward as part of the complex anatomy. Crowding or distortion of the brainstem at this level can contribute to the neurological symptoms seen in these more severe forms. Understanding the pons adds to the picture of the brainstem structures that can be affected in Chiari, particularly the more serious types where more of the brainstem is involved.
Why it matters
Understanding the pons helps families see another brainstem structure that can be involved in severe Chiari, contributing to the range of neurological symptoms in these more serious forms.
Common questions
What is the pons?
The middle part of the brainstem, above the medulla.
What does it do?
It relays signals and contributes to breathing, facial movement, hearing, and balance.
How is it involved in Chiari?
It can be involved in the displacement of severe types.
Bottom line
The pons is the middle brainstem part relaying signals and aiding several functions, and can be involved in severe Chiari malformations.
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