Muscle Insertions and Origins

Question 1

Superficial pectoralis

Answer 1

Origin: first 2 sternebrae

insertion: greater tubercle of humerus
action: adduct the limb, prevent abduction when weight bearing

Question 2

Deep pectoralis

Answer 2

origin: ventral sternum
insertion: greater and lesser tubercles of the humerus
action: adduction of the limb

Question 3

Brachiocephalicus

Answer 3

origin: distal humerus
insertion: mastoid process of temporal bone
action: extend the shoulder, draw neck to side

Question 4

Omotransversarius

Answer 4

origin: distal scapular spine
insertion: wing of the atlas
action: extend shoulder, flex neck laterally

Question 5

Trapezius

Answer 5

origin: median raphe of the neck
insertions: scapular spine
action: elevate and abduct the limb

Question 6

rhomboideus

Answer 6

origin: nuchal crest of occipital bone
insertion: dorsal border of scapula
action: elevate the limb and keep the scapula against the trunk

Question 7

Latissimus Dorsi

Answer 7

origin: lumbar and last thoracic vertebrae
insertion: teres major tuberosity
action: flex the shoulder, retract the limb

Question 8

Serratus ventralis

Answer 8

origin: transverse processes o cervical vertebrae
insertion: dorsal medical scapula
action: support trunk

Question 9

Deltoideus

Answer 9

origin: spine and acromion of scapular spine
insertion: deltoid tuberosity of the humerus
action: flex the shoulder

Question 10

Supraspinatus

Answer 10

origin: supraspinous fossa
insertion: greater tubercle of humerus
action: sted the shoulder

Question 11

Infraspinatous

Answer 11

origin: infraspinous fossa
insertion: greater tubercle of the humerus
action: rotate the arm and adducts the arm

Question 12

Subscapularis

Answer 12

origin: subscapular fossa
insertion: lesser tubercle of humerus
action: adduct and extend the shoulder

Question 13

Teres major

Answer 13

origin: caudal border of scapula
insertion: teres major tuberosity of humerus
action: flex the shoulder

Question 14

teres minor

Answer 14

origin: distal third of caudal border of scapula
insertion: ters minor tuberosity of humerus
action: flex the shoulder

Question 15

coracobrachilais

Answer 15

origin: coracoid process of the scapula
insertion: lesser tubercle of humerus

Question 16

tenso fascia antebrachii

Answer 16

origin: fasica on lateral side of latissimus dorsi
insertion: olecranon
action: extend the elbow

Question 17

triceps brachii

Answer 17

origin: long head is caudal scapula, lateral and accessory are humerus, and medial is from lesser tubercle of humerus
insertion: olecranon
action: extend elbow

Question 18

Anconeus

Answer 18

origin: epichondyles of huemerus
insertion: lateral proximal ulna

Question 19

biceps brachii

Answer 19

origin: supraglenoid tubercle
insertion: ulnar and radial tuberosities
action: flex the elbow, extend shoulder

Question 20

brachialis

Answer 20

origin: proximal third of lateral surface of the humerus
insertion: ulnar and radial tuberosities
action: flex the elbow

Question 21

extensor carpi raidalis

Answer 21

origin: lateral humerus
insertion: dorsal surface of metacarpals 2 and 3
action: extend carpus

Question 22

common digital extensor:

Answer 22

origin: lateral epichondlyle of humerus
insertion: distal phalanges 1-4