MICRO 20 Lecture Notes - Lecture 5: Sacral Plexus, Anterior Ramus Of Spinal Nerve, Lumbar Plexus
Document Summary
Serves as an important intermediate between brain and the body. Carries information into and out of cns via spinal nerves for everything below the neck. Provides integration site for reflex arcs to produce rapid responses to certain stimuli. From foramen magnum to area between l1 and l2. Tapers off to a point called conus medullaris. Each segment has two branches off dorsal side and two branches off ventral side of segment called spinal roots a. b. c. Each dorsal root has a bulb unit called dorsal root ganglion. Dorsal and ventral roots merge to form spinal nerve. Each spinal cord segment ha a pair of spinal nerves that branch off of it through intervertebral foramen. Spinal cord segments and spinal nerve pairs are named for vertebrae around them a. b. c. d. e. f. g. 8 cervical spinal cord segments and nerve pairs (c1 - c8) 12 thoracic spinal cord segments and nerve pairs (t1 - t12)
