chapter 13

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chapter 13
2011-04-27 23:12:56

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  1. Peripheral Nervous System
    • * The peripheral nervous system (PNS) consists of nerves that branch from the CNS (brain and spinal cord)
    • * Two major sets of nerves: cranial and spinal
    • * PNS can be subdivided into somatic (control) and autonomic (no control) nervous system
    • * Somatic nervous system consists of cranial nerves and spinal nerves that connect to the skin and skeletal system
    • * Autonomic nervous system connect to visceral organs (heart, stomach, glands...)
  2. Spinal nerves
    • * 31 pares of cranial nerves originate from the spinal cord
    • * Mixed nerves that allow communication between the spinal cord and various parts of the body
    • * 5 groups of nerves: cervical (8), thoracic (12), lumbar (5), sacral (5), coccygeal (1)
    • * Spinal nerves form complex network called plexus
  3. Cervical plexuses [NECK]
    • * Lie deep within the neck
    • * Supply muscles and skin of the neck
    • * Includes the phrenic [central respiration] nerve which innervates the diagram
  4. Cranial nerves
    • * Olfactory nerve (I): sense of smell
    • * Optic nerve (II): sense of vision
    • * Oculomotor (III): movement of eye muscles
    • * Trochlear (IV): movemetn of eye muscles
    • * Trigeminal (V):
    • o Sensory to face at the anterior scalp and the lacrimal glands, upper teeth, upper lip, behind the ear, and the lower lip
    • o Motor to muscles for mastication and the floor of the mouth
    • * Abducens (IV): motor fibers to the eye muscle
    • * Facial nerve (V):
    • o Sensory to taste
    • o Motor to muscles of facial expression
    • * Vestibulocochlear nerve(VI): sensory for balance and hearing
    • * Glossopharaneal (IX):
    • o Sensory to tongue and pharynx
    • o Motor to pharynx and swallowing
    • * Vagus nerve (X): sensory and motor to larynx, heart, and viscera
    • * Accessory nerve(XI): motor to neck and upper muscles
    • * Hypoglossal nerve(XII): motor fibers to tongue during chewing, speaking, and swallowing
  5.  Brachial plexuses [ARM]
    • * Located deep within the shoulder
    • * Supply the skin and muscles of the arm, forearm, and the hand
  6. Lumbosacral plexuses [LEG]
    • * Extend from the lumbar region of the back into the pelvic cavity
    • * Supply the muscle and skin of the lower abdominal wall external genitalia, thighs, legs, and feet