Definition

Noun: - A major pathway of the central nervous system, appearing as a large bundle of nerve fibers (myelinated neurons) on the ventral (underside) surface of the midbrain. It connects the cerebral hemispheres to the brainstem and carries motor information from the cerebrum to other parts of the brain and spinal cord.

Usage

The term is used in anatomical, neurological, and medical contexts to describe this specific neural structure. - The surgeon carefully avoided the cerebral peduncle during the procedure to remove the tumor. - Damage to the cerebral peduncle can result in significant motor deficits on the opposite side of the body.

Advanced Usage

• "Crus cerebri": This is a more specific term, often used synonymously with "cerebral peduncle" in a strict anatomical sense to refer specifically to the anterior (front) part of the peduncle, which contains the large descending motor tracts.
  • The corticospinal tracts descend through the crus cerebri.

Variants and Related Words

• Peduncle (n): A stem-like connecting part. In neuroanatomy, it refers to any stalk-like bundle of nerve fibers connecting different parts of the brain (e.g., , ).
• Midbrain (n): The part of the brainstem where the cerebral peduncles are prominently located.
• Basis pedunculi: Another term for the ventral portion of the cerebral peduncle.

Synonyms

• Crus cerebri (specific anatomical synonym)
• Pedunculus cerebri (Latin term)

Related Phrases/Compound Terms

• Cerebral peduncle syndrome: A neurological condition resulting from a lesion (e.g., stroke) in the cerebral peduncle, typically characterized by contralateral (opposite-side) weakness or paralysis.
• Weber's syndrome: A specific brainstem stroke syndrome involving damage to the cerebral peduncle and the oculomotor nerve, leading to ipsilateral (same-side) eye movement palsy and contralateral body weakness.

Noun

1. a bundle of myelinated neurons joining different parts of the brain