Muscles (Origin, Insertion, InnerVation, Action) [Pass 1]

Question 1

Deltoid (3O, 6A)

Answer 1

O: Clavice, acromion of scapula, scapular spine
I: Humerus
V: Axillary
A: Flex/ext, int/ext rot, ADduct/ABduct arm @ shoulder

Question 2

Pectoralis major (3O, 2V, 3A)

Answer 2

O: Clavicle, sterum and ribs 1-6, rectus sheath
I: Humerus
V: Medial and lateral pectoral
A: Flex, ADduct, int rot arm @ shoulder

Question 3

Pectoralis minor

Answer 3

O: Ribs 3-5
I: Coracoid process of scapula
V: Medial pectoral
A: Draw scapula downward

Question 4

Latissimus dorsi (4O, 3A)

Answer 4

O: T7-T12 and thoracolumbar fascia, scapula, ribs 9-12, iliac crest
I: Humerus
V: Thoracodorsal
A: Ext, int rot, ADduct upper limb

Question 5

Teres major (3A)

Answer 5

O: Scapula
I: Humerus
V: Lower subscapular
A: Ext, int rot, ADduct arm @ shoulder

Question 6

Subscapularis

Answer 6

O: Scapula
I: Humerus
V: Subscapular
A: Int rot arm @ shoulder

Question 7

Serratus anterior (2A)

Answer 7

O: Ribs 1-9
I: Scapula
V: Long thoracic
A: Lower raised arm, rot scapula lat, others…

Question 8

Teres minor (2A)

Answer 8

O: Scapula
I: Humerus
V: Axillary
A: Ext rot arm, weakly ADduct arm @ shoulder

Question 9

Long head of triceps brachii (3A)

Answer 9

O: Scapula
I: Olecranon of ulna
V: Radial
A: Ext rot forearm @ elbow, ext, ADduct arm @ shoulder

Question 10

Lateral head of triceps brachii (3A)

Answer 10

O: Humerus
I: Olecranon of ulna
V: Radial
A: Ext rot forearm @ elbow, ext, ADduct arm @ shoulder

Question 11

Medial head of triceps brachii (3A)

Answer 11

O: Humerus
I: Olecranon of ulna
V: Radial
A: Ext rot forearm @ elbow, ext, ADduct arm @ shoulder

Question 12

Anconeus (2A)

Answer 12

O: Humerus
I: Ulna
V: Radial
A: Ext forearm @ elbow, stabilize elbow

Question 13

Biceps brachii (2O, 5A)

Answer 13

O: Scapula x2
I: Radius
V: Musculocutaneous
A: Flex elbow, supinate forearm, flex, int rot, ABduct arm @ shoulder

Question 14

Coracobrachialis (3A)

Answer 14

O: Coracoid process of scapula
I: Humerus
V: Musculocutaneous
A: Flex, int rot, ADduct arm @ shoulder

Question 15

Brachialis

Answer 15

O: Humerus
I: Ulna
V: Musculocutaneous
A: Flex at elbow

Question 16

Brachioradialsis

Answer 16

O: Distal humerus
I: Radius
V: Radial nerve
A: Weak flex forearm @ elbow

Question 17

Pronator teres (2O, 2A)

Answer 17

O: Medial epicondyle of humerus, ulna
I: Radius
V: Median
A: Pronate forearm, weakly flex forearm @ elbow

Question 18

Flexor carpi radialis (2A)

Answer 18

O: Medial epicondyle of humerus
I: Carpus
V: Median
A: Flex, ABduct (radial dev) hand @ wrist

Question 19

Palmaris longus

Answer 19

O: Medial epicondyle of humerus
I: Palmar aponeurosis
V: Median
A: Weakly flex arm @ elbow, tighten palmar aponeurosis

Question 20

Flexor carpi ulnaris (2O, 2A)

Answer 20

O: Medial epicondyle of humerus, olecranon of ulna
I: Carpus
V: Ulnar
A: Flex, ADduct (ulnar dev) hand @ wrist

Question 21

Flexor digitorum superficialis (2O, 2A)

Answer 21

O: Medial epicondyle of humerus, ulna
I: Middle phalanges
V: Median
A: Flex hand @ wrist, flex digits @ MCP and PIP, weakly flex forearm @ elbow

Question 22

Flexor pollicis longus (5A)

Answer 22

O: Middle of radius
I: Phalanx of thumb
V: Median
A: Flex hand, ABduct (radial dev) hand @ wrist, flex thumb @ MCP, IP, CMC

Question 23

Flexor digitorum profundus (2O, 2V, 4A)

Answer 23

O: Middle of ulna, interosseous membrane (IOM)
I: Phalanges of digits
V: Ulnar, median
A: Flex hand @ wrist, flex digits @ MCP, PIP, DIP

Question 24

Pronator quadratus (2A)

Answer 24

O: Distal ulna
I: Distal radius
V: Median
A: Pronate hand, stabilize distal radioulnar joint