Medial Rotators

Question 1

Pectoralis Major

Answer 1

Origin- med 1/2 ant border of clavicle, ant surface of sternum, ant surface of upper 6 costal cartilages and rib6
Insertion- lat lip of intertubercondylar groove via laminated tendon (almost 90deg rotation)

Innervation- Med/Lat Pectoral C5-8

Question 2

Latissimus Dorsi

Answer 2

Origins- via thoracolumbar fascia from spinous recesses T6-12 and all lumbar and sacral vertebrae
- iliac crest
- lower 4 ribs and inf angle of scapula
Insertion- floor of intertubercular groove (rotates 90deg again)

Innervation Thoracodorsal C6-8

Question 3

Teres Major

Answer 3

Origin- inf angle of scapula
Insertion- med lip of intertubercular groove

Innervation- Lower Scapular C5-6

Question 4

Subscapularis

Answer 4

Origin- subscapular fossa
Insertion- lesser tubercle of humerus

Innervation- Upper/Lower Subscapula L5-7

Question 5

Deltoid (ant fibres)

Answer 5

Origin- lat 1/2 of clavicle
Insertion- mid shaft of humerus; deltoid tubercle

Innervation- Axillary C5-6