Laboratory Manual For Human Anatomy & Physiology
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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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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Which of the following muscles resist the actions of the supination of the forearm Bicep brachii Brachialis Corabraschialis Pronator teres    Which of the following muscles causes flexion at the  wrist? Flexor carpi radialis Extensor carpi radialis longus Extensor digitorum    Extensor carpi ulnaris   If a scapula is protracted which of the following muscles is in a shortened position? Pectoralis minor Middle  trapezius Infraspinatus rhomboid   The cyclic pattern of the engagement of the muscle and joints of the body during walking is known as the   Ambulation cycle  Gallop cycle  Gait cycle  Motor cycle
* 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?
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