Arm & Forearm Overview

Question 1

Pronator Teres

Answer 1

O: humeral head- medial epicondyle, and Supra-epicondylar ridge
Ulnar side- medial side of coronoid process
I: lateral surface midshaft of radius
N: median nerve (C6-C7)
A: Pronation

Question 2

Flexor Carpi Radialis

Answer 2

O: medial epicondyle of humerus
I: base of metacarpal 2 and 3
N: Median Nerve (C6, C7)
A: Flexion and radial deviation of wrist

Question 3

Palmaris Longus

Answer 3

O: medial epicondyle of humerus
I: palmar aponeurosis of hand
N: median nerve (C7, C8)
A: Wrist Flexion

Question 4

Flexor carpi ulnaris

Answer 4

O: humeral head- medial epicondyle of humerus
Ulnar head- olecranon and posterior border of ulna
I: pisiform and hook of hamate
N: ulnar nerve (c7, c8, T1)
A: wrist Flexion and ulnar deviation

Question 5

Flexor digitorum superficialis

Answer 5

O: humeral head- medial epicondyle and coranoid process
Radial head- oblique line of radius
I: via 4 tendons palmar surface middle phalanges 2-5
N: median nerve (c8, t1)
A: PIP Flexion fingers 2-5, MCP Flexion fingers 2-5, wrist Flexion

Question 6

Flexor digitorum profundus

Answer 6

O: anterior & medial surface of ulna & anterior medial half of interosseous membrane
I: via 4 tendons palmar surface distal phalanges 2-5
N: lateral portion median nerve, medial half by ulnar nerve (c8, t1)
A: DIP Flexion 2-5, wrist flexion

Question 7

Flexor pollicis longus

Answer 7

O: anterior surface of radius & anterior medial 1/2 of interosseous membrane
I: palmar surface of base of distal phalanx of thumb
N: anterior interosseous branch of median nerve (c7, c8)
A: flexes interphalangeal joint of thumb & MCP of thumb

Question 8

Pronator Quadratus

Answer 8

O: distal anterior surface of ulna
I: distal anterior surface of radius
N: anterior interosseous branch of median nerve (c7, c8)
A: pronation

Question 9

Brachioradialis

Answer 9

O: Proximal part lateral supra-epicondylar ridge of humerus and adjacent inter muscular septum
I: lateral surface distal end of radius
N: Radial Nerve (C5, C6)
A: Elbow flexion with forearm in mid pronation

Question 10

Extensor Carpi Radialis Longus

Answer 10

O: Distal part lateral supra-epicondylar ridge of humerus and adjacent inter muscular septum
I: Dorsal surface base of metacarpal 2
N: Radial Nerve (C6, C7)
A: Extension & radial deviation of wrist

Question 11

Extensor Carp Radialis Brevis

Answer 11

O: lateral epicondyle
I: dorsal surface base of metacarpal 2 & 3
N: Deep branch radial nerve (C7,C8)
A: Extension & radial deviation of wrist

Question 12

Extensor Digitorum

Answer 12

O: lateral epicondyle
I: four tendons inserting via extensor hoods not dorsal aspects of middle & distal phalanges 2-5
N: Posterior interosseous branch radial nerve (C7,C8)
A: extension of fingers 2-5 & wrist extension

Question 13

Extensor Digiti Minimi

Answer 13

O: lateral epicondyle
I: extensor hood of little finger
N: posterior interosseous branch radial nerve (C7,C8)
A: extension of little finger

Question 14

Extensor Carpis Ulnaris

Answer 14

O: lateral epicondyle & posterior boarder of ulna
I: base of 5th metacarpal
N: posterior interosseous branch radial nerve (C7, C8)
A: extension & ulnar deviation of wrist

Question 15

Anconeus

Answer 15

O: lateral epicondyle & posterior boarder of ulna
I: olecranon & posterior surface of ulna
N: radial nerve (C6, C7, C8)
A: abduction of ulna with pronation & accessory elbow extensor

Question 16

Supinator

Answer 16

O: Superficial part- lateral epicondyle, radial collateral and angular ligaments
Deep part- supinator crest of ulna
I: lateral surface of radius superior to anterior oblique line
N: posterior interosseous branch of radial nerve (C6, C7)
A: supination

Question 17

Abductor Pollicis Longus

Answer 17

O: Posterior surface of ulna, radius, & interosseous membrane
I: base of 1st metacarpal
N: posterior interosseous branch of radial nerve (C7, C8)
A: abduction of thumb CMC joint

Question 18

Extensor Pollicis Brevis

Answer 18

O: posterior surface of radius & interosseous membrane
I: dorsal surface base of proximal phalanx of thumb
N: posterior interosseous branch of radial nerve (C7, C8)
A: extends MCP & CMC of thumb

Question 19

Extensor Pollicis Brevis

Answer 19

O: posterior surface of radius & interosseous membrane
I: dorsal surface base of proximal phalanx of thumb
N: posterior interosseous branch of radial nerve (C7, C8)
A: extends MCP & CMC of thumb

Question 20

Extensor Pollicis Longus

Answer 20

O: Posterior surface of ulna & interosseous membrane
I: dorsal surface base of distal phalanx of thumb
N: posterior interosseous branch of radial nerve (C7, C8)
A: interphalangeal extension of thumb, CMC & MCP extension

Question 21

Extensor Indicis

Answer 21

O: posterior surface of ulna & interosseous membrane
I: extensor hood of
N: posterior interosseous branch of radial nerve (C7, C8)
A: extends index finger

Question 22

Biceps Brachii

Answer 22

O: long head- supraglenoid tubercle
short head- tip of coracoid process
I: radial tuberosity & fascia of forearm via bicipital aponeurosis
N: Musculocutaneous nerve (C5, C6)
A: flex/sup forearm, flex shoulder when elbow is fixed, stabilizes head of abducted humerus

Question 23

Coracobrachialis

Answer 23

O: tip of coracoid process
I: middle 3rd medial surface of humerus
N: musculocutanous nerve (C5, C6, C7)
A: flexion of arm at glenohumeral joint

Question 24

Brachialis

Answer 24

O: distal 1/2 anterior surface of humerus
I: tuberosity of ulna
N: Musculocutaneous nerve (C5, C6)
A: Flexes forearm

Question 25

Triceps Brachii

Answer 25

O: long head- interior glenoid tubercle
lateral head- upper 1/2 posterior humerus
medial head- distal 2/3 medial & posterior humerus
I: olecranon of ulna
N: radial nerve (C6, C7, C8)
A: extends forearm, GH extension, stabilizes head of abducted humerus