OIA upper limb and facial muscles

Question 1

masseter

Answer 1

Origin: zygomatic arch and maxilla
Insertion: coronoid process and ramus of mandible
Action: elevates and protracts mandible

Question 2

sternocleidomastoid

Answer 2

Origin: sternum and clavicle
Insertion: mastoid process
Action: rotates head; flexes neck

Question 3

trapezius

Answer 3

Origin: external occipital protuberance; superior nuchal line; spinous processes of C7-T12
Insertion: clavicle, acromion process; spine of scapula
Action: rotates, retracts, elevates, and depresses scapula; extends neck

Question 4

deltoid

Answer 4

Origin: clavicle, acromion process, and spine of scapula
Insertion: deltoid tuberosity
Action: flexes, extends, and abducts shoulder joint

Question 5

biceps brachii

Answer 5

Origin: supraglenoid tubercle and coracoid process
Insertion: radial tuberosity
Action: flexes elbow and shoulder; supinates forearm

Question 6

triceps brachii

Answer 6

Origin: infraglenoid tubercle and posterior shaft of humerus
Insertion: olecranon process
Action: extends elbow and shoulder

Question 7

extensor digitorum

Answer 7

Origin: lateral epicondyle of humerus
Insertion: digits 2-5
Action: extends digits 2-5

Question 8

flexor digitorum superficialis

Answer 8

Origin: medial epicondyle of the humerus
Insertion: 2-5
Action: flexes digits 2-5

Question 9

opponens pollicis

Answer 9

Origin: trapezium
Insertion: first metacarpal
Action: opposition of the thumb

Question 10

Brachial plexus

Answer 10

Upper limb

Question 11

Musculocutaneous nerve

Answer 11

Anterior upper arm

Question 12

Median Nerve

Answer 12

Anterior forearm and thenar region

Question 13

Ulnar Nerve

Answer 13

Hand, except thenar region

Question 14

Radial Nerve

Answer 14

Posterior upper arm and posterior forearm

Question 15

Axillary Nerve

Answer 15

Shoulder (deltoid and teres major)