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PAS 407 Muscles of the Back (Exam 1) 2024/2025 verified Solution
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PAS 407 Muscles of the Back (Exam 1) 2024/2025 verified Solution
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Passed!!2024/2025
PAS 407 Muscles of the Back
(Exam 1)
extrinsic muscles Answer: - generate movements in upper appendages; no
direct effects on movements of axial skeleton
- innervated by ventral rami of spinal nerves (antero-lateral)
intrinsic muscles Answer: - muscles insert on axial skeleton
- innervated by dorsal (posterior) rami of spinal nerves
superficial group of extrinsic back muscles Answer: aka posterior
axioappendicular muscles
acts on shoulder girdle
- move scapula,
insertion of trapezius Answer: lateral 1/3 of clavicle, acromion and spine of
scapula
action of trapezius Answer: elevates, retracts, depresses and rotates scapula
innervation of trapezius Answer: accessory nerve (CN XI) 11
, Passed!!
2024/2025
* only ext. back muscle that isn't innervated by ventral rami
What is the clinical role of the trapezius? Answer: maintaining proper
alignment of the shoulder girdle
Dropped Shoulder Syndrome Answer: weakness/paralysis of trapezius results
in chronic depression of scapula;
can lead to further strain on cervical vertebrae, cervical nerves
superior fibers of trapezius Answer: scapular elevation and slight upward
rotation of scapular
inferior fibers of trapezius Answer: scapular depression and slight downward
rotation
middle fibers or maximal activation of entire muscle Answer: scapular
retraction towards the vertebral column
action of latissimus dorsi Answer: - extends, adducts, and medially rotates
humerus
- raises body toward arms during climbing
*acts on shoulder joint
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