infratentorial
Pronunciation: in-fruh-ten-TORE-ee-ul
Located below the tentorium cerebelli, referring to the posterior fossa containing the brainstem and cerebellum.
Full Definition
Anatomical term describing structures located below the tentorium cerebelli, a fold of dura mater that separates the cerebrum from the cerebellum and brainstem. The infratentorial compartment, also known as the posterior fossa, contains critical structures including the brainstem (midbrain, pons, medulla), cerebellum, and fourth ventricle. Tumors and lesions in this region often present unique surgical challenges due to the proximity of vital structures controlling breathing, heart rate, and consciousness. This anatomical distinction is fundamental in neurosurgical planning and risk assessment.
Usage
Usage note: Do not hyphenate unless used as a compound modifier before a noun.
In Context
- "The infratentorial meningioma required careful dissection to avoid injury to the brainstem." — Operative report
- "Postoperative monitoring protocols differ for infratentorial versus supratentorial procedures." — Clinical guidelines