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Ch 7 PNS and Cranial nerves
peripheral nervous system
the section of the nervous system lying outside the brain and spinal cord AKA PNS
any bundle of nerve fibers running to various organs and tissues of the body
delicate connective tissue around individual nerve fibers in nerve
connective tissue that covers a bundle of nerve fibers
Bundle of nerve or muscle fibers bound together by connective tissue.
outermost layer of connective tissue on the spinal nerve; a dense network of collagen fibers
nerves composed of both sensory and motor fibers
AKA afferent nerves, carry messages to the brain & spinal cord from a receptor; afferent nerves
12 pairs of nerves arising from the brain
CN I the nerve that carries impulses from olfactory receptors in the nose to the brain
CN II the cranial nerve that serves the retina
CN III supplies extrinsic muscles of the eye
CNIV either of the two cranial nerves on either side that control the superior oblique muscles of the eyes
CN V the main sensory nerve of the face and motor nerve for the muscles of mastication
CN VI a small motor nerve supplying the lateral rectus muscle of the eye
CNVII; mixed nerve that controls muscles of the scalp and face. provides sensations over the face and receives taste information from the tongue.
CN VIII hearing and balance
CN IX; swallowing, salication, gag reflex, sensation from tongue and ear
CN X a mixed nerve that supplies the pharynx and larynx and lungs and heart and esophagus and stomach and most of the abdominal viscera
CNXI; has an internal branch which innervates voluntary swallowing muscles of the soft palate and pharynx, and an external branch, which controls muscles associated with the pectoral girdle
CNXII supplies intrinsic muscles of the tongue and other tongue muscles
31 pairs of nerves arising from the spinal cord
branch of spinal nerve that supplies nerves to muscle of the back and the skin
spinal nerves T2 - T12 pass anteriorly as the intercostal nerves to supply the muscles of the anterior and lateral trunk
Formed from groups of nerves that join together to do a common function after they have left the spinal cord