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Questions and Answers
Which muscle assists in stabilizing the head of the humerus within the glenoid cavity?
Which muscle assists in stabilizing the head of the humerus within the glenoid cavity?
- Deltoid
- Infraspinatus
- Subscapularis (correct)
- Supraspinatus
Which nerve supplies the supraspinatus muscle?
Which nerve supplies the supraspinatus muscle?
- Upper subscapular nerve
- Axillary nerve
- Suprascapular nerve (correct)
- Lower subscapular nerve
From which part of the scapula does the deltoid muscle originate?
From which part of the scapula does the deltoid muscle originate?
- Anterior border of the lateral 1/3 of the clavicle
- Lower lip of the crest of the spine of the scapula (correct)
- Subscapular fossa
- Lateral border of the acromion
What action does the middle fibers of deltoid muscle perform?
What action does the middle fibers of deltoid muscle perform?
Which artery is not included in the shoulder region's arterial supply?
Which artery is not included in the shoulder region's arterial supply?
Flashcards
Subscapularis muscle
Subscapularis muscle
A muscle that helps stabilize the head of the humerus (upper arm bone) within the glenoid cavity (shoulder socket).
Suprascapular nerve
Suprascapular nerve
The nerve that supplies the supraspinatus muscle, which helps raise your arm.
Deltoid origin
Deltoid origin
The deltoid muscle starts at the lower lip of the crest of the spine of the scapula (shoulder blade).
Middle deltoid action
Middle deltoid action
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Shoulder artery NOT included
Shoulder artery NOT included
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Study Notes
Muscles of the Shoulder
- The supraspinatus muscle is assisted by the rotator cuff muscles in stabilizing the head of the humerus within the glenoid cavity.
- The supraspinatus muscle is supplied by the suprascapular nerve.
- The deltoid muscle originates from the lateral margin of the acromion process of the scapula.
- The middle fibers of the deltoid muscle perform abduction of the arm.
- The intercostal artery is not included in the shoulder region's arterial supply.
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