ZOO 3733C Lecture Notes - Lecture 6: Spina Bifida, Subarachnoid Cisterns, Lumbar Puncture
Document Summary
Spinal cord, meninges, nerve roots, spinal vessels, csf and fat tissue. Dura matter (outer layer), arachnoid matter (middle layer), pia matter (inner layer) Denticulate ligaments: extensions of pia matter that support the spinal cord. & separate the ventral and dorsal roosts of the spinal nerves. Describe the intermeningeal spaces and their contents. o. Epidural space: (between bone & dura matter) contains fat, vertebral veins, & nerve roots o o. Subarachnoid space: between arachnoid & pia matter, contains csf. Lies below the termination of the spinal cord as the medullary cone. It contains the cauda equina, which contains nerve roots & the filum terminale floating in the csf. Adults: lower level of l1, newborns: level of l3. Dura matter continues downward to s2, where a dural sac or lumbar cistern is formed for lumbar puncture. Lumbar puncture is done at the l3-l5 region by piercing through the dura & arachnoid maters. Sacralization: the fusion of the l5 vertebra to the sacrum.
