PEDS100 Chapter Notes -Dorsal Root Ganglion, Anterior Ramus Of Spinal Nerve, Peripheral Nervous System

• School: University of Alberta
• Department: Physical Education and Sport
• Course: PEDS100
• Professor: Gail Amort- Larson

Document Summary

Nervous system: central nervous system: controls everything encased by bone. Spinal cord: peripheral nervous system: everything outside of bone. Cranial nerves(12 pairs) (has both sensory and motor neurons) Peripheral nerves (31 pairs) (has both sensory and motor neurons) P: posterior horn, dorsal rootlets connect here, sensory neurons travel through here. Segmental spinal nerves: only innervate certain areas (trunk, upper abdominal) Anterior rami: t2-t12, only looks after ribs (nipple is t4, umbilical t10) Plexuses: complex interwoven network of nerve fibers, cervical(neck), brachial(upper back/lower neck), lumbar(lower back), sacral(sacrum) Brachial plexus: larger, more complex than cervical plexus, formed by ventral rami of spinal nerves c5-t1. Ventral rami converge to form superior(c5,c6), middle(c7), and inferior trunks(c8,t1). Each is then divided into anterior and posterior divisions: posterior cord: formed by posterior divisions. Forms axillary nerve and radial nerve: lateral cord: formed by anterior divisions of superior and middle trunks. Forms musculocutaneous nerve: medial cord: formed by continuation of anterior division of inferior trunk.