BIOL 2110K Lecture Notes - Lecture 17: Conus Medullaris, Meninges, Medial Lemniscus
Document Summary
Has rootlets that form spinal nerves; some form nerve plexus. Large diameter of spinal cord in cervical region; due to neurons that innervate the upper limbs. Large diameter of spinal cord in mid-lumbar region due to neurons that innervate the lower limbs. Conus medullaris: tapering end marking end of spinal cord prope; Cauda equine is the nerve roots projecting inferiorly from spinal cord, contains filum terminale: thin strand of pia mater, helps anchor conus medullaris to coccyx. Between dura mater and inner walls of the vertebra. Potential space between dura mater and arachnoid mater. Innermost meningeal layer of elastic and collagen fibers. Triangular extensions of spinal pia mater that attach to dura mater. Has areolar ct, blood vessels, adipose tissue; epidural anesthetics introduced here. Adheres to spinal cord and supports blood vessels. Found in t1-l2; contains cell bodies of autonomic motor neurons. Axons of sensory neurons and cell bodies of interneurons.
