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9 Cards in this Set
- Front
- Back
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Define Peripheral Nervous System |
Nerves that originate within the brain and spinal cord, but end peripherally. It consists of 12 pairs of cranial nerves and 31 spinal nerves. These nerves all have afferent and efferent fibers for communication between the body and the CNS.
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Name the 12 Cranial Nerves |
Olfactory Nerve - (A) smell; noes Optic - (A) sight; eyes Oculomotor - (E) levator of eyelid, smooth muscle of eyeball, inferior oblique muscle of eyeball. Trochlear - (E) superior oblique muscle of eyeball Trigeminal - (A) touch, pain: skin to face, mucous membranes of nose, sinuses, mouth, anterior tongue. (A) Muscles of mastication. Abducens - (E) Lateral rectus muscle of eyeball Facial - (A) taste, anterior tongue. (E)Facial muscles Vestibulocochlear - (A) hearing and balance, Glossopharyngeal - (A) taste, touch pain; posterior tongue. (E) select muscles of pharynx. Vagus - (A) touch/pain: pharynx, larynx, bronchi, taste: tongue, epiglottis. Accessory - (E) SCM and trapezius Hypoglossal - (E) muscles of tongue.
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How many spinal nerves are there? |
31 pairs: 8 Cervical 12 Thoracic 5 Lumbar 5 Sacral 1 Coccygeal |
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Define Myelinated |
Nerve has a myelin sheath to increase conductivity. A fibers and B fibers.
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Define Unmyelinated |
Does not have myelin sheath and has slower conduction rate. C fibers. |
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Define Afferent |
Ascending sensory nerves
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Define Efferent |
Descending motor nerves |
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Define somatic |
Pertaining to the body |
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Define Visceral |
Pertaining to the internal organs. |
