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Questions and Answers
Where do the anterior fibers of the deltoid muscle originate?
Where do the anterior fibers of the deltoid muscle originate?
- Lateral border of the acromion
- Lower lip of the spine of the scapula
- Anterior border of lateral 1/3 of clavicle (correct)
- Deltoid tuberosity of the humerus
Which nerve innervates the deltoid muscle?
Which nerve innervates the deltoid muscle?
- Suprascapular nerve (C5&6)
- Radial nerve
- Subscapular nerves (C5&6)
- Axillary nerve (C5&6) (correct)
Where is the supraspinatus muscle located in relation to the greater tuberosity?
Where is the supraspinatus muscle located in relation to the greater tuberosity?
- Lower impression of the greater tuberosity
- Medial 3/4 of supraspinatous fossa
- Middle impression of the greater tuberosity
- Top of the greater tuberosity (correct)
What muscle is part of the rotator cuff group?
What muscle is part of the rotator cuff group?
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Which muscle inserts on the medial 3/4 of the subscapular fossa?
Which muscle inserts on the medial 3/4 of the subscapular fossa?
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Study Notes
Deltoid Muscle
- Anterior fibers originate from the anterior border of the lateral 1/3 of the clavicle
- Middle fibers originate from the lateral border of the acromion
- Posterior fibers originate from the lower lip of the spine of the scapula
- Inserts into the deltoid tuberosity of the humerus
- Innervated by the axillary nerve (C5&6)
Subscapularis Muscle
- Occupies the medial 3/4 of the subscapular fossa
- Inserts into the lesser tuberosity
- Innervated by the subscapular nerves (C5&6)
Supraspinatous Muscle
- Occupies the medial 3/4 of the supraspinatous fossa
- Inserts into the top of the greater tuberosity (double)
- Innervated by the suprascapular nerve (C5&6)
Infraspinatous Muscle
- Occupies the medial 3/4 of the infraspinatous fossa
- Inserts into the middle impression of the greater tuberosity
- Innervated by the suprascapular nerve (C5&6)
Rotator Cuff
- Consists of Supraspinatus, Infraspinatus, Subscapularis, Teres major, and Teres minor muscles
Teres Minor Muscle
- Occupies the upper 2/3 of the dorsal aspect of the lateral border of the scapula
- Inserts into the lower impression of the greater tuberosity
- Innervated by the axillary nerve (C5&6)
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