Scapulohumeral Muscles Flashcards
Scapulohumeral Muscles
Rotator Cuff:
- Subscapularis
- Supraspinatus
- Infraspinatus
- Teres Minor
Others:
- Teres Major
- Deltoid
- Triceps Brachii
Subscapularis origin
Subscapular Fossa of Scapula
Subscapularis insertion
Lesser tubercle of the humerus
Subscapularis innervation
Upper and Lower Subscapular Nerve
branches of the post. cord of BP
Subscapularis arterial supply
subscapular artery
Supraspinatus origin
supraspinous fossa of scapula
Supraspinatus insertion
greater tubercle of humerus; superior facet
Supraspinatus innervation
Suprascapular nerve
- (upper trunk of BP)
- through suprascapular notch
- deep to supra / infraspinatus
Supraspinatus arterial supply
Suprascapular artery
- “above” suprascapular notch
- deep to supra / infraspinatus
Infraspinatus origin
infraspinous fossa of scapula
Infraspinatus insertion
greater tubercle of humerus; middle facet
Infraspinatus innervation
Suprascapular nerve
- (upper trunk of BP)
- through suprascapular notch
- deep to supra / infraspinatus
Infraspinatus arterial supply
Suprascapular artery
- “above” suprascapular notch
- deep to supra / infraspinatus
Teres minor origin
lateral border of scapula; superior portion
Teres minor insertion
Greater tubercle of humerus; inferior facet
Teres minor innervation
Axiallary nerve
- posterior chord of BP
- travels with posterior humeral artery
- found in quadrangular space
- dumps into deltoid
Teres minor arterial supply
Posterior humeral circumflex artery
- branch of the axillary artery
- travels with axillary nerve
- found in quadrangular space
- dumps into deltoid
Supraspinatus action
abduction
Infraspinatus action
external rotation arm
teres minor action
external rotation and adduction of arm
Deltiod origin
Lateral third of clavicle
acromion of scapula
spine of scapula
Deltoid insertion
deltoid tuberosity of humerus
deltoid innervation
axillary nerve
- also innervates teres minor
- travels with posterior humeral circumflex artery
deltoid arterial supply
posterior circumflex humeral artery
- branch of the axillary artery
- travels with axillary nerve
- found in quadrangular space
Teres major origin
posterior surface of inferior angle of scapula
Teres major insertion
medial lip of intertubercular grove of humerus
Teres major innervation
lower subscapular nerve
- also innervates subscapularis
Teres major action
internal rotation
adduction
extension of arm
