Explanation The glenohumeral joint is the most freely movable joint in the human body and the muscles associated with it help in the movement of the shoulder. It contributes in flexion, extension, abduction, adduction, medial and lateral rotation of the humerus. It consists of rotator cuff muscles that surround the joint and they stabilize the shoulder along with tendons. The subscapularis, supraspinatus, infraspinatus, and teres minor muscles are the four muscles that are grouped as rotator cuff muscles. These muscles create a balanced force and act as dynamic stabilizers of the head of the humerus during range of motion (ROM). In a normal positioned shoulder, the rotator cuff muscles stabilize the anterior-posterior translation of humeral head. This is due to the antagonistic forces of subscapularis and infraspinatus or teres minor muscles that compress the glenoid...

7th Edition

ISBN: 9780073522760

Author: Susan J Hall

Publisher: McGraw-Hill Education

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Question

Chapter 7, Problem 6AP

Summary Introduction

To discuss: The importance of rotator cuff muscles as stabilizers of the glenohumeral joint and movers of the humerus.

Concept introduction: The glenohumeral joint is the major shoulder joint. It is a ball-and-socket joint that is formed by the articulation of humerus head with the glenoid fossa of the scapula.

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Chapter 7, Problem 5AP

Chapter 7, Problem 8AP

Chapter 7 Solutions

Basic Biomechanics

Ch. 7 - Construct a chart listing all muscles crossing the...Ch. 7 - Prob. 2IP Ch. 7 - Prob. 3IP Ch. 7 - INTRODUCTORY PROBLEMS 4. List the muscles that...Ch. 7 - INTRODUCTORY PROBLEMS 5. List the muscles used as...Ch. 7 - INTRODUCTORY PROBLEMS 6. Explain how the use of an...Ch. 7 - INTRODUCTORY PROBLEMS 7. Select a familiar...Ch. 7 - 8. Using the diagram in Sample Problem 7.1 as a...Ch. 7 - 10. Solve Sample Problem 7.2 with the addition of...Ch. 7 - Identify the sequence of movements that occur at...

Ch. 7 - Which muscles are most likely to serve as agonists...Ch. 7 - Prob. 3AP Ch. 7 - ADDITIONAL PROBLEMS 4. Which muscles are most...Ch. 7 - Prob. 5AP Ch. 7 - Prob. 6AP Ch. 7 - 8. How much tension (Fm) must be supplied by the...Ch. 7 - 9. What is the length of the moment arm between...Ch. 7 - Prob. 10AP

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