PHTY209 Lecture Notes - Lecture 3: Central Nervous System, Medial Lemniscus, Dura Mater
Document Summary
Distinguish between the central nervous system and the peripheral nervous system; Central nervous system (cns) encased in the skull and vertebral column (brain, spinal cord) Peripheral nervous system (pns) emerges from numerous foramina composed of 31 pairs of spinal nerves that attach to the spinal cord and the cranial nerves (10 at brainstem; 12 in total) The spinal cord occupies the upper 2/3 of the vertebral canal. It extends from the foramen magnum to lumbar vertebral column, ends level with the. Cord is divided into segments (n=31), named and numbered as the vertebral column was named and numbered. From each segment emerge groups of dorsal and ventral root(let)s, which then combine to form the spinal nerve at each level name and briefly describe the membranous structures around the spinal cord. The spinal cord consists of 3 layers (meningeal layers): outer to inner. Create spaces epidural (external to dura) and subarachnoid (between arachnoid and pia) filled with.