HTHSCI 1H06 Lecture Notes - Lecture 13: Posterior Grey Column, Spinal Nerve, Grey Matter
20 Dec 2018
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Document Summary
Pns are neurons that have exited spinal cord. Spinal nerve, dorsal ramus supplying back, ventral ramus supplying anterior side. A spinal nerve is composed of axons covered in epineurium. Processes sensory input from pns into cns and motor output. Relays sensory info to brain and relays motor info to pns. Sensory nerves come in through dorsal and ventral branches, Sensory nerves come in through dorsal and ventral branches, goes into dorsal root. Motor nerves arrive in ventral root of spinal cord, join peripheral nerve by going out ventral root and then distributed to rest of body through dorsal and ventral rami. Ascending tracts carry sensory info up, more associated with back of spinal cord. Spinal cord is shorter than the bony vertebral column and canal. Spinal cord ends at vertebral bone level l2. Dermatome - a region of skin innervated by a spinal segment. A region of muscle innervated by a spinal segment.
