Gross Anatomy I Lecture - Scapular Muscles
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28 Terms
what is the origin of the anterior portion of the deltoid?
clavicle
what is the origin of the middle portion of the deltoid?
acromion process/scapula
what is the origin of the posterior portion of the deltoid?
spine/scapula
what is the insertion of the deltoid?
deltoid tuberosity/humerus
what actions does the anterior portion of the deltoid carry out?
1. flexes humerus
2. medially rotates humerus
what action does the middle portion of the deltoid carrry out?
abducts humerus
what actions does the posterior portion of the deltoid carry out?
1. extends humerus
2. laterally rotates humerus
what is the innervation of the deltoid?
axillary nerve
what is the origin of the supraspinatus?
supraspinous fossa/scapula
what is the insertion of the supraspinatus?
greater tuberosity/humerus
what actions does the supraspinatus carry out?
1. initiates abduction of humerus
2. laterally rotates humerus
3. stabilizes shoulder joint
what is the innervation of the supraspinatus?
suprascapular nerve
what is the origin of the infraspinatus?
infraspinous fossa/scapula
what is the insertion of the infraspinatus?
greater tuberosity/humerus
what actions does the infraspinatus carry out?
1. laterally rotates humerus
2. stabilizes shoulder joint
what is the innervation of the infraspinatus?
suprascapular nerve
what is the origin of the subscapularis?
subscapular fossa/scapula
what is the insertion of the subscapularis?
lesser tuberosity/humerus
what actions does the subscapularis carry out?
1. medially rotates humerus
2. stabilizes shoulder joint
what is the innervation of the subscapularis?
upper and lower subscapular nerve
what is the origin of the teres major?
inferior angle/scapula
what is the insertion of the teres major?
intertubercular groove/humerus
what actions does the teres major carry out?
1. adducts humerus
2. stabilizes shoulder joint
3. medially rotates humerus
what is the innervation of teres major?
lower subscapular nerve
what is the origin of teres minor?
axillary boarder/scapula
what is the insertion of the teres minor?
greater tuberosity/humerus
what actions does the teres minor carry out?
1. laterally rotates humerus
2. stabilizes shoulder joint
what is the innervation of teres minor?
axillary nerve