Arm and Forearm Muscles

Question 1

Triceps Brachii

Answer 1

Origin: infraglenoid tubercle (long head); posterior humerus (medial and lateral heads)
Insertion: Olecranon process of ulna
Innervation: Radial nerve

Question 2

Anconeus

Answer 2

Origin: lateral epicondyle of humerus
Insertion: lateral aspect of the olecranon and superior aspect of the shaft of the ulna
Innervation: radial nerve

Question 3

Biceps Brachii

Answer 3

Origin: supraglenoid tubercle (long head), coracoid process (short head) of scapula
Insertion: Tuberosity of radius
Innervation: musculocutaneous nerve

Question 4

Brachialis

Answer 4

Origin: mid to distal humerus on either side of deltoid tuberosity
Insertion: Coronoid process of ulna (just distal to trochlear notch)
Innervation: musculocutaneous nerve

Question 5

Brachioradialis

Answer 5

Origin: lateral supracondylar ridge of distal humerus
Insertion: Lateral aspect of distal radius, just superior to radial styloid process
Innervation: radial nerve

Question 6

Pronator Teres

Answer 6

Origin: medial epicondlye of humerus and coronoid process of ulna
Insertion: antero-lateral aspect of radial shaft (mid-shaft)
Innervation: median nerve

Question 7

Supinator

Answer 7

Origin: lateral epicondyle of humerus and ridge near radial notch of ulna
Insertion: proximal antero-lateral radius
Innervation: radial nerve

Question 8

Flexor carpi radialis

Answer 8

Origin: medial epicondyle of humerus
Insertion: base of the 2nd and 3rd metacarpals
Innervation: medial nerve

Question 9

Palmaris Longus

Answer 9

Origin: medial epicondyle of humerus
Insertion: flexor retinaculum and palmar aponeurosis
Innervation: median nerve

Question 10

Flexor Carpi Ulnaris

Answer 10

Origin: medial epicondyle of humerus
Insertion: pisiform; hamate; base of 5th metacarpal
Innervation: ulnar nerve

Question 11

Extensor carpi radialis longus

Answer 11

origin: lateral supracondylar ridge of humerus
Insertion: base of 2nd metacarpal
Innervation: radial nerve

Question 12

Extensor Carpi Radialis Brevis

Answer 12

Origin: Lateral epicondyle of humerus
Insertion: base of 3rd metacarpal
Innervation: radial nerve

Question 13

Extensor Carpi Ulnaris

Answer 13

Origin: Lateral epicondyle of humerus and posterior border of ulna
Insertion: base of 5th metacarpal (dorsal aspect)
Innervation: radial nerve

Question 14

Elbow Extensors Muscles

Answer 14

Triceps Brachii
Anconeus

Question 15

Elbow Flexors

Answer 15

Biceps Brachii
Brachialis
Brachioradialis (Pronator/supinator as well)

Question 16

Forearm Action

Answer 16

Pronator teres
Supinator

Question 17

Wrist flexors

Answer 17

Pronator Teres
Flexor carpi radialis
Palmaris longus
Flexor carpi ulnaris
Flexor Digitorum Superficialis
Flexor Digitorum Profundus

Question 18

Wrist Extensors

Answer 18

Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris

Question 19

Flexor digitorum superficialis

Answer 19

Origin: medial epicondyle of humerus
Insertion: anterior margins of the bases of intermediate phalanges of digits 2-4
Innervation: median nerve

Question 20

Flexor digitorum profundus

Answer 20

Origin: upper 3/4 of anterior/medial surfaces of body of the ulna; interosseous membrane
Insertion: base of distal phalanges of digits 2-4
Innervation: median nerve