Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Chapter 13, Problem 12RQ

(a) Define plexus, (b) Indicate the ventral rami of origin of the four major nerve plexuses.

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(a) Describe the anatomical relationship of the white and gray rami communicantes to a spinal nerve, and to the dorsal and ventral rami. (b) Why are gray rami communicantes gray?
For each of the following muscles or body regions, identify the plexus and the peripheral nerve (or branch of one) involved. Use one choice from Key A followed by one choice from Key B.                                                              Key A: Plexuses                                                     Key B: Nerves(a) brachial                                             (1) common fibular (6) phrenic(b) cervical                                             (2) femoral (7) radial(c) lumbar                                               (3) median (8) tibial(d) sacral                                               (4) musculocutaneous (9) ulnar                                                               (5) obturatorStructure Innervated__,__ (1) the diaphragm__,__(2) muscles of the posterior compartments of thigh and leg__,__(3) anterior compartment thigh muscles__,__(4) medial compartment thigh muscles__,__(5) anterior arm muscles that flex the forearm__,__(6) muscles that…
Spinal nerves are called mixed nerves because they, (a) are associated with a pair of spinal ganglia. (b) exit at intervertebral foramina. (c) contain sensory and motor fibers. (d) are associated with a pair of dorsal and ventral roots.
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