Scapular Muscles

Question 1

Deltoid

Answer 1

O: lat 1/3 of clavicle, acromion, and spine of scapula

I: deltoid tuberosity of humerus

A: anterior= flexes, int rot; middle= A24
lateral= extends, ext rot

N: axillary n. (C5, C6)

Question 2

Supraspinatus

Answer 2

O: supraspinous fossa

I: greater tubercle of humerus

A: A24 of arm

N: suprascapular n. (C4, C5, C6)

Question 3

Infraspinatus

Answer 3

O: infraspinous fossa

I: greater tubercle of humerus

A: ext rotates arm; holds humerus in glenoid

N: suprascapular n. (C4, C5, C6)

Question 4

Teres Minor

Answer 4

O: sup. lateral border of scapula

I: greater tubercle of humerus

A: ext. rotates arm; holds arm in glenoid

N: axillary n (C5, C6)

Question 5

Teres Major

Answer 5

O: inf. angle of scapula

I: intertubercular groove of arm

A: int. rotates arm; A44 arm;

N: lower subscapular n. (C5, C6)

Question 6

Subscapularis

Answer 6

O: subscapular fossa

I: lesser tubercle of humerus

A: int. rotates and A44 arm; holds head of humerus in glenoid

N: upper/lower sub scapular n. (C5, C6, C7)