Damage to the serratus anterior muscle is tested by having a patient push agains
ID: 96731 • Letter: D
Question
Damage to the serratus anterior muscle is tested by having a patient push against a wall with an outstretched upper limb. If there is weakness or paralysis of the muscle, the scapula will do which of the following? (Circle one.) ___ a. adduct excessively ___ b. abduct excessively ___ c. "wing" (medial border moves posterior) ___ d. depress excessively One or more of the rotator cuff muscles cause which of the following movements of the arm? (Check all that apply) ___ a. abduction ___ b. adduction ___ c. extension ___ d. flexion ___ e. lateral rotation ___ f. medial rotationExplanation / Answer
Answer 3:- Option c
Explanation:- Scapular upward rotation is controlled primarily by a force couple between the upper and lower trapezius and the serratus anterior muscles. The lower serratus anterior and lower trapezius is positioned to produce posterior tilting of scapula. Weakness in these muscles is clearly associated with scapular winging. Scapular winging is said to occur when there is excessive anterior tilting and scapular internal rotation.
Answer 4:- Option a, b, e and f
Explanation:- The rotator cuff muscles are responsible for shoulder stability. These muscles impart stability by centering the humeral head in the joint socket (the glenoid cavity). Theses muscles also tighten the joint capsule preventing a pinch during shoulder movements. The rotator cuff plays a major role in the internal and external rotation of the upper arm in the shoulder joint.
The rotator cuff is made up of four muscles:-
Supraspinatus:-It performs abduction of the shoulder, especially abduction over 60 degress.
Infraspinatus:- It is a powerful external rotator. It also assists in abduction and adduction.
Teres minor:- It is responsible primarily for external rotation. It also partly plays role in retroversion and adduction.
Subscapularis:- It is a powerful internal rotator. It also supports upper arm during abduction and adduction.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.