The axillary nerve in the shoulder region is susceptible to damage For example

The axillary nerve in the shoulder region is

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The axillary nerve in the shoulder region is susceptible to damage. For example, a person using crutches should be taught to bear the weight of the body on the hands and not on the armpit, or axillary region. The weight of the body can damage the axillary nerve, causing crutch palsy The radial and ulnar nerves, which serve the forearm, wrist, and hand, also emerge from the brachial plexus. Damage to the radial nerve can cause a wristdrop, and injury to the ulnar nerve causes the hand to appear clawlike; the person is unable to spread the fingers apart. Lumbosacral plexus (T12, L1 to L5, S1 to S4) The lumbosacral plexus gives rise to nerves that supply the muscles and skin of the lower abdominal wall, external genitalia, buttocks, and lower extremities. The sciatic nerve, the longest nerve in the body, arises from this plexus. The sciatic nerve supplies musculature of the thigh, leg, and foot. The sciatic nerve can become inflamed and cause intense pain in the buttock and posterior thigh region. A common cause of sciatica is a ruptured or herniated vertebral disc What a Dermatome Is A dermatome is a sensory thing. Each dorsal root of a spinal nerve innervates a particular area of the skin; this distribution of nerves is called a dermatome Each dermatome is named for the particular nerve that serves it. - For example, the C4 dermatome is innervated by the C4 spinal nerve. Dermatomes are useful clinically; - For example, if the skin of the shoulder region is stimulated with the tip of a pin and the
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person cannot feel it, the clinician has reason to believe that the C4 nerve is impaired. Functional Classification of the Peripheral Nervous System The functional classification explains where the nerves go and what they do. The functional classification of the peripheral nervous system includes the following: The somatic afferent nerves , which bring sensory information from the different parts of the body, particularly the skin and muscles, to the CNS The somatic efferent nerves , which bring motor information from the CNS to the skeletal muscles throughout the body The autonomic nervous system (ANS) is composed of nerves that supply the organs (viscera), smooth muscle, and glands.
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  • Fall '19
  • Spinal nerve, Brachial plexus

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