11 19 07 - Nervous System II

11 19 07 - Nervous System II - Chapter 13: Nervous System...

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Chapter 13: Nervous System I: Organization Evolution of Spinal nerves Lampreys: segmental ventral roots innervate muscles of the body wall (somatic motor) - intersegmental dorsal roots contain all other types (SS, VS, VM) - Fish & Amphibians: segmental dorsal and ventral roots combine forming a spinal nerve - dorsal roots contain SS, VS, and some VM - ventral roots contain SM and some VM - the combined spinal nerve (containing all 4 types of neurons) divide into 3 rami : 1) Dorsal rami: SM, SS to the epaxial muscles and nearby structures 3) Visceral rami: VM, VS to the visceral structures (heart, lungs, gut, etc) Mammals: just like fish and amphibs, except: Only Sensory neurons leave the spinal cord at the dorsal root: SS, VS. All VM carried by the ventral root Embryology of the spinal cord and spinal nerves The CNS forms from the process of neurulation
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This note was uploaded on 08/16/2008 for the course BIOL 276 taught by Professor Johnson during the Spring '07 term at UNC.

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11 19 07 - Nervous System II - Chapter 13: Nervous System...

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