5 Questions
Where do the anterior fibers of the deltoid muscle originate?
Anterior border of lateral 1/3 of clavicle
Which nerve innervates the deltoid muscle?
Axillary nerve (C5&6)
Where is the supraspinatus muscle located in relation to the greater tuberosity?
Top of the greater tuberosity
What muscle is part of the rotator cuff group?
Teres minor
Which muscle inserts on the medial 3/4 of the subscapular fossa?
Subscapularis
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)
Test your knowledge on the anatomical details of the deltoid muscle, its different fibers, and the surrounding shoulder muscles like Subscapularis, Supraspinatous, and Infraspinatous. Understand the attachment points and nerve supplies related to these muscles.
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