MEDRADSC 2H03 Lecture Notes - Lecture 17: Tentorium Cerebelli, Falx Cerebri, Dural Venous Sinuses

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 2H03
• Professor: Alana Trainor

Document Summary

Meninges: 3 protective membranes that surround the brain. Epidural space (aka extradural): between periosteum/dura mater, contains meningeal vessels that supply cranium/meninges. Dura mater: outermost, double layer: dural sinuses live between the layers of the dura mater leave deep grooves in occipital bones provide venous drainage from brain, dural folds separate and support brain structures. Falx cerebri: separates left and right hemispheres of cerebrum attaches posteriorly to tentorium cerebelli. Tentorium cerebelli: separates cerebrum/cerebellum has a notch in it (incisura oval shaped, which surrounds the midbrain, pathologies here tentorial herniation) Subdural space: between dura mater and arachnoid. Arachnoid membrane: continuous flow of csf, excess csf gets picked up by dural sinuses (connected by arachnoid villi, granulations: when villi get large (granulation pitting: too big) Subarachnoid space: separates arachnoid/pia mater, contains csf. Frontal: mediates reason/judgement, emotions, voluntary muscle movement, mechanical/motor speech, broca"s area: If injury: unable to form sounds (mechanical problem-frustration)