Arm, Elbow, Hand

Question 1

Biceps Brachii

Answer 1

O: Long Head: supraglenoid tubercle of scapula
Short Head: coracoid process

I: Radial Tuberosity

Inn: Musculotaneous n. (C5-C6)

A: Elbow flexion, supination; Shoulder flex, stabilization of humeral head during deltoid contraction; Humerus abduction and internal rotation.
(Elbow Flexed Biceps act as powerful supinator)

Question 2

Coracobrachialis

Answer 2

O: Coracoid Process

I: Inline with crest of lesser tubercle

Inn: Musculocutaneous (C5-C7)

A: flexion, adduction, internal rotation

Question 3

Brachialis

Answer 3

O: Distal anterior half of humerus

I: Ulnar Tuberosity

Inn: Musculocutaneous (C5-C6)

A: flexion at elbow joint

Question 4

Triceps Brachii

Answer 4

O: Long Head: Infraglenoid tubercle of scapula
Medial Head: Posterior Humerus, inferior to radial groove
Lateral Head: Post Humerus, proximal to radial groove

I: Olecranon of Ulna

Inn: Radial n. (C6-C8)

A: Elbow: extension
Shoulder: (Long Head) Extension and adduction

Question 5

Brachioradialis

Answer 5

O: Distal humerus

I: Styloid process of radius

Inn: Radial n. (C5,C6)

A: Elbow Flex., Minor pronation at forearm

Question 6

Extensor Carpi Radialis Longus

Answer 6

O: Lateral supracondylar ridge of distal humerus

I: Base of 2nd Metacarpal

Inn: Radial n. (C6,C7)

A: Weak Elbow Flex. , Wrist Ext and radial deviation

Question 7

Extensor Carpi Radialis Brevis

Answer 7

O: Lateral epicondyle of humerus

I: Base of 3rd metacarpal

Inn: Radial n. (C7,C8)

A: Weak elbow flex., Wrist ext and radial deviation

Question 8

Extensor Digitorum

Answer 8

O: Lateral epicondyle of humerus

I: Dorsal digital expansion of 2nd-5th digits

Inn: Radial n. (C7,C8) Posterior Interosseous

A: Wrist: Ext.
MCP, PIP, DIP 2-5: Extension, Abduction of fingers

Question 9

Extensor Digitorum minimi

Answer 9

O: Lateral Epicondyle of humerus

I: Dorsal digital expansion of 5th digit

Inn: Radial n. (C7,C8)

A: Wrist: Ext., Ulanr deviation
MCP, PIP, DIP 5th digit: Ext/ABD of 5th digit.

Question 10

Extensor Carpi Ulnaris

Answer 10

O: Lateral Epicondyle of humerus, dorsal surface of ulnar

I: Base of the 5th metacarpal

Inn: Radial n. (C7,C8) Posterior Interosseous

A: Wrist Ext., Ulnar Deviation

Question 11

Supinator

Answer 11

O: Olecranon, lateral epicondyle, RCL, anular ligament

I: Radius (between radial tuberosity and insertion of pronator teres

Inn: Radial n. (C6,C7) Posterior Interosseous

A: Supination

Question 12

Abductor Pollicis Longus

Answer 12

O: Dorsal surface of radius and ulnar interosseous

I: Base of 1st metacarpal

Inn: Radial n. (C7,C8) Posterior Interosseous

A: Radial deviation, Abduction of 1st metacarpal

Question 13

Extensor Pollicis Brevis

Answer 13

O: Dorsal surface of radius and IO membrane

I: Base of proximal phalanx of thumb

Inn: Radial n. (C7,C8) Posterior Interosseous

A: Radial deviation, 1st digit extension

Question 14

Extensor Pollicis Longus

Answer 14

O: Dorsal surface of Ulna and IO membrane

I: Base of distal phalanx of thumb

Inn: Radial n. (C7,C8) Posterior Interosseous

A: Wrist Ext., Radial deviation. Adduction/Ext. of thumb

Question 15

Extensor Indicis

Answer 15

O: Dorsal surface of Ulna and IO membrane

I: Posterior digital extension of 2nd digit

Inn: Radial n. (C7,C8) Posterior Interosseous

A: Wrist extension, 2nd digit extension.

Question 16

Pronator Teres

Answer 16

O: Humeral Head: Medial Epicondyle of Humerus
Ulnar Head: Coronoid Process
I: Lateral Radius (Distal to Supinator Insertion)
Inn: Median n. (C6,C7)
A: Weak elbow flexor, Forearm Pronation

Question 17

Flexor Carpi Radialis

Answer 17

O: Medial Epicondyle of Humerus

I: Base of 2nd Metacarpal (Variance: Base of 3rd Metacarpal)

Inn: Median n. (C6,C7)

A: Wrist Flexion, Radial Deviation

Question 18

Palmaris Longus

Answer 18

O: Medial Epicondyle of Humerus

I: Palmar Aponeurosis

Inn: Median n. (C7,C8)

A: Weak Elbow Flexion, Wrist flexion tightens palmar aponeurosis

Question 19

Flexor Carpi Ulnaris

Answer 19

O: Medial Epicondyle of Humerus; Olecranon of Ulna

I: Pisiform; Hook of Hamate; Base of 5th Metacarpal

Inn: Ulnar n. (C7-T1)

A: Wrist Flexion, Ulnar deviation of hand

Question 20

Flexor Digitorum Superficialis

Answer 20

O: Medial Epicondyle of Humerus (Humeral-Ulnar Head); Upper 1/2 of anterior border of radius

I: Sides of middles phalanges 2nd-5th digits

Inn: Median n. (C8, T1)

A: Weak Elbow Flexor, Wrist Flexion, Flexion of MCP, PIP of 2nd-5th digits

Question 21

Flexor Digitorum Profundus

Answer 21

O: Proximal 2/3 of Flexor Surface of Ulna; Interosseous Membrane

I: Distal Phalanges of 2nd to 5th Digits (Palmar Surface)

Inn: 2-3 Anterior Ante Brachial Interosseous n. , 4-5 ulnae n.

A: Flexion of Wrist, MCP, PIP, DIP of 2nd to 5th Digits

Question 22

Flexor Pollicis Longus

Answer 22

O: Mid-anterior surface of radius, adjacent interosseous membrane

I: Distal phalanx of tumb (Palmar Surface)

Inn: Anterior Ante Brachial Interosseous n.

A: Wrist Flexion, Radial Deviation, Flexion Carpometacarpal of Thumb, Flexion MCP, IP of Thumb

Question 23

Pronator Quadratus

Answer 23

O: Distal 1/4 of Anterior Ulnar Surface

I: Distal 1/4 of Anterior Radial Surface

Inn: Anterior Ante Brachial Interosseous n.

A: Pronation; Distal Radioulnar Joint Stablization