Pectoral Girdle

Question 0

Pectoralis major

Answer 0

origin= ribs 1-6, sternum, clavicle
insertion= intertubercular groove of humerus
action= medial rotation, adduction, flexion
innervation= lateral/medial pectoral nerve

Question 1

Deltoid

Answer 1

origin= lateral 1/2 of clavicle, acromion, scapular spine
insertion= deltoid tuberosity
action= abduction (15-90), everything but adduction
innervation= axillary nerve

Question 2

latissimus dorsi

Answer 2

origin= iliac crest, inferior ribs, spinous processes of T,L,S vertebrae
insertion= intertubercular groove of humerus
action= medial rotation, adduction, extension
innervation= thoracodorsal/medial subscapular

Question 3

teres major

Answer 3

origin= inferior angle of scapula
insertion= medial lip of intertubercular groove of humerus
action= adduction, medial rotation
innervation= lower subscapular

Question 4

coracobrachialis

Answer 4

origin= coracoid process of scap.
insertion= medial side of humeral shaft
action= flexion, adduction
innervation= musculocutaneous

Question 5

supraspinatus

Answer 5

origin= supraspinous fossa
insertion= greater tubercle of humerus
action= abduct (0-90)
innervation= suprascapular nerve

Question 6

infraspinatus

Answer 6

origin= infraspinous fossa
insertion= greater tubercle of humerus
action= laterally rotate, adduct
innervation= suprascapular nerve

Question 7

subscapularis

Answer 7

origin= subscapular fossa
insertion= lesser tubercle of humerus
action= medially rotate, adduct
innervation= upper/lower subscapular nerve

Question 8

teres minor

Answer 8

origin= lateral border of scap.
insertion= greater tubercle of humerus
action= laterally rotate, adduction
innervation= axillary nerve

Question 9

trapezius

Answer 9

origin= occipital bone, C7-T12 vertebral spines
insertion= clavicle, scapular spine, acromion
action= lateral rotation, elevate scapula, medial rotation, retraction, depression, extension of neck
innervation= cranial nerve XI

Question 10

rhomboid minor

Answer 10

origin= C7, T1
insertion= medial scap. border @ base of scapular spine
action= retraction, medial rotation
innervation= dorsal scapular nerve

Question 11

rhomboid major

Answer 11

origin= T2-T5
insertion= medial border of scapula below scap spine
action= retraction, medial rotation
innervation= dorsal scapular

Question 12

levator scapulae

Answer 12

origin= C1-C4
insertion= medial scap. border above scap spine
action= elevate, medially rotate
innervation= dorsal scapular

Question 13

pectoralis minor

Answer 13

origin= ribs 3-5
insertion= coracoid process of scap.
action= protraction, scap. stabilization
innervation= medial pectoral nerve

Question 14

serratus anterior

Answer 14

origin= ribs 1-8
insertion= medial border of scap
action= stabilize scap against thoracic wall, protraction, lateral rotation
innervation= long thoracic nerve