Ch 7 PNS and Cranial nerves
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Created by:
eagleswings59 Plus on March 18, 2012
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Marieb
Classes:
Anatomy & Physiology, Anatomy & Physiology Final Exam, malonek ahs anatomy and physiology
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25 terms
Terms | Definitions |
|---|---|
 peripheral nervous system | the section of the nervous system lying outside the brain and spinal cord AKA PNS |
| nerve | any bundle of nerve fibers running to various organs and tissues of the body |
| endoneurium | delicate connective tissue around individual nerve fibers in nerve |
| perineurium | connective tissue that covers a bundle of nerve fibers |
| fasicles | Bundle of nerve or muscle fibers bound together by connective tissue. |
| epineurium | outermost layer of connective tissue on the spinal nerve; a dense network of collagen fibers |
| mixed nerves | nerves composed of both sensory and motor fibers |
| sensory nerves | AKA afferent nerves, carry messages to the brain & spinal cord from a receptor; afferent nerves |
| cranial nerves | 12 pairs of nerves arising from the brain |
| olfactory nerve | CN I the nerve that carries impulses from olfactory receptors in the nose to the brain |
| optic nerve | CN II the cranial nerve that serves the retina |
| oculomotor nerve | CN III supplies extrinsic muscles of the eye |
| trochlear | CNIV either of the two cranial nerves on either side that control the superior oblique muscles of the eyes |
| trigeminal | CN V the main sensory nerve of the face and motor nerve for the muscles of mastication |
| abducens | CN VI a small motor nerve supplying the lateral rectus muscle of the eye |
| facial nerve | CNVII; mixed nerve that controls muscles of the scalp and face. provides sensations over the face and receives taste information from the tongue. |
| vestibulocochlear | CN VIII hearing and balance |
| glossopharangeal | CN IX; swallowing, salication, gag reflex, sensation from tongue and ear |
| vagus | 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 |
| accessory nerve | 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 |
| hypoglossal | CNXII supplies intrinsic muscles of the tongue and other tongue muscles |
| spinal nerves | 31 pairs of nerves arising from the spinal cord |
| dorsal rami | branch of spinal nerve that supplies nerves to muscle of the back and the skin |
| ventral rami | spinal nerves T2 - T12 pass anteriorly as the intercostal nerves to supply the muscles of the anterior and lateral trunk |
| plexuses | Formed from groups of nerves that join together to do a common function after they have left the spinal cord |
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