Shoulder and upper arm muscles flashcards

TERES MAJOR Posterior extensor of upper arm

Origin:
• Inferior angle of scapula

Insertion:
• Intertubercular sulcus of humerus

Innervation:
• Inferior and middle subscapular
nerves

Action:
• Medial rotation and extension

SUPRASPINATUS Rotator cuff muscle

Origin:
• Supraspinous fossa

Insertion:
• Superior portion of greater
tubercle of humerus

Innervation:
• Suprascapular nerve

Action:
• Initiates abduction stabilizes
shoulder by preventing downward
dislocation

, INFRASPINATUS Rotator cuff muscle

Origin:
• Infraspinous fossa

Insertion:
• Greater tubercle under insertion of
supraspinatus

Innervation:
• Suprascapular nerve

Action:
• Lateral rotation of humerus

TERES MINOR Rotator cuff muscle

Origin:
• Lateral border of scapula

Insertion:
• Greater tubercle below
infraspinatous insertion

Innervation:
• Axillary nerve

Action:
• Lateral rotation of humerus

SUBSCAPULARIS Rotator cuff muscle

Origin:
• Subscapular fossa

Insertion:
• Lesser tubercle of humerus

Innervation:
• Subscapular nerve

Action:
• Main medial rotator of humerus