Lab 3

Question 1

Supraspinatus

Answer 1

O: Supraspinous fossa of Scapula
I: Superior facet of the greater tubercle of the humerus, joint capsule
A: Abduction (esp. first 30deg), and stabilization of GH joint in motion
N: Suprascapular nerve

Question 2

Infraspinatus

Answer 2

O: Infraspinous fossa of scapula
I: Middle facet of the greater tubercle of the humerus, joint capsule
A: ER, stabilization
N: Suprascapular nerve

Question 3

Teres Minor

Answer 3

O: Superior lateral border of scapula
I: Inferior facet of the greater tubercle of the humerus
A: ER, stabilization
N: Axillary nerve

Question 4

Subscapularis

Answer 4

O: Subscapular fossa of the scapula
I: Lesser tubercle of the humerus
A: IR, stabilization
N: Upper and lower subscapular nerve

Question 5

Deltoids

Answer 5

Anterior:
O: Lateral 1/3 of clavicle
Middle:
O: Acromion process
Posterior:
O: Posterior border of the scapula

I: deltoid tuberosity of the humerus

Anterior:
A: Horizontal adduction, flexion, IR
Middle:
A: Abduction (with anterior and posteriors fibers firing together)
Posterior:
A: Horizontal abduction, extension, ER

N: Axillary nerve

Question 6

Pectoralis Major

Answer 6

O: Medial 1/3 of the clavicle, sternum, costal cartilages of ribs 1-7 (and aponeurosis of external obliques)
I: Lateral lip of the intertubercular groove of the humerus
A: Flex/Ex, horizontal adduction, IR, adduction
N: Medial and lateral pectoral nerve

Question 7

Latissimus Dorsi

Answer 7

O: Spinous processes of T7-L5 via the thoracolumbar fascia, sacral and iliac crests, posterior iliac crest, Ribs 8-12, inferior angle of the scapula
I: Floor of the intertubercular groove of the humerus
A: IR, Extension, Adduction
N: Thoracodorsal nerve

Reverse OI: Anterior pelvic tilt

Question 8

Teres Major

Answer 8

O: Lateral border of the scapula, inferior angle of scapula
I: Medial lip of intertubercular groove of humerus
A: IR, Extension, Adduction
N: Lower subscapular nerve