Anatomy and Cell Biology 3319 Midterm: Test 2 Complete Exam Notes - Oct 24-Dec 3.docx
12 Dec 2013
School
Department
Professor
Document Summary
Describe the location and function of the 3 meningeal layers: Dura mater: periosteal layer: adheres to bone, meningeal layer: associated with meninges beneath it, layers separate at dural venous sinuses. Pia mater: denticulate ligament: extensions of pia mater to anchor spinal cord to dura mater, dural sac: from l2/l3 to s2 contains cauda equina and filum terminale (pia mater extension) Meningeal spaces: epidural space (potential) developed if hemorrhage, subdural space (potential) developed if hemorrhage, subarachnoid space (true) Lumbar puncture/spinal tap in this space (between l3/l4 or l4/l5 because no spinal cord here, just cauda equina) Cerebral veins drain into dural venous sinuses. Apply knowledge of the meninges to clinical cases involving hemorrhage: Middle meningeal artery travels through dura, in grooves on lateral aspect of calvaria: vulnerable to damage at pterion, brief loss of consciousness, followed by lucid interval, drowsiness and coma due to compression of brain.
