Laboratory Manual For Human Anatomy & Physiology
4th Edition
ISBN: 9781260159363
Author: Martin, Terry R., Prentice-craver, Cynthia
Publisher: McGraw-Hill Publishing Co.
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Textbook Question
Chapter 23, Problem 5.2CT
Tendons of the rotator cuff muscles hold the head of the humerus to the glenoid cavity of the scapula. What agonist (prime mover) of arm abduction are these muscles assisting?
Why is their synergistic action important, particularly in sports where there is repetitive throwing or rotation of the arm (e.g., pitching, cricket, swimming)?
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* These muscles (and subscapularis) form the rotator cuff which is a critical stabilizing element
for the glenohumeral joint (shoulder joint). Thus, one action for each of these muscles is to
stabilize the shoulder joint. Examine the rotator cuff muscles in the cadaver and see if you can
determine where the tendons incompletely surround the head of the humerus. What clinical
significance does this have?
During shoulder abduction what movement occurs at the scapulothoracic joint and what muscles contribute to this?
Chapter 23 Solutions
Laboratory Manual For Human Anatomy & Physiology
Ch. 23 - Chest and shoulder muscles that move the arm at...Ch. 23 - Muscles located in the arm that move the forearm...Ch. 23 - Rotator cuff muscles all have origins on the a....Ch. 23 - Which of the following is not a rotator cuff...Ch. 23 - The belly of the muscle is usually ________ the...Ch. 23 - The belly of the flexor digitorumprofundus muscle...Ch. 23 - There are more muscles that move the forearm than...Ch. 23 - The action of the brachialis muscle is flexion of...Ch. 23 - FIGURE 23.7 Label the deep anterior muscles of the...Ch. 23 - Label the muscle of respiration of the posterior...
Ch. 23 - FIGURE 23.9 Identify the posterior muscles of the...Ch. 23 - FIGURE 23.10 Label the anterior muscles of the...Ch. 23 - FIGURE 23.11 Identify the anterior muscles of the...Ch. 23 - Match the muscles in column A with the actions in...Ch. 23 - Name the muscle indicated by the following...Ch. 23 - Name the muscle indicated by the following...Ch. 23 - Name the muscle indicated by the following...Ch. 23 - Name the muscle indicated by the following...Ch. 23 - Name the muscle indicated by the following...Ch. 23 - Name the muscle indicated by the following...Ch. 23 - Name the muscle indicated by the following...Ch. 23 - Name the muscle indicated by the following...Ch. 23 - Identify the muscles indicated in figure 23.12....Ch. 23 - Tendons of the rotator cuff muscles hold the head...
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- The right levator scapula is contracted with the intent to only elevate the scapula, no other actions at the scapula are desired. Please complete the following two part question What are all of the muscles that could act as a synergist/neutralizer during this motion? What muscle would be the best option for a synergist/neutralizer and justify your answer?arrow_forwarddescribe scapulohumeral movement, or synergy, that takes place with the shoulder joint and girdle. What muscles are acting to create these motions? What could happen if this synergy did not occur?arrow_forwardMost of the muscles attached to the scapula are fixators, but a few do contribute to arm movement. Compare and contrast two fixators of the scapula with two muscles attached to the scapula that contribute to arm movement?arrow_forward
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