Forearm muscles

Question 1

Brachioradialis

Answer 1

PA: Superior 2/3 of lat supracondylar ridge of humerus, lat inter muscular Setpum

DA: Distal aspect of lat surface of radius, proximal to styloid process

INN: Radial (C5,6)

ACTIONS: Flexes the elbow

Question 2

Extensor Carpi Radialis Longus

Answer 2

PA: Inf 1/3 of supracondylar ridge, inter muscular septum, lat epicondyle of humerus by CET

DA: Base of 2nd MC on dorsal lat aspect

INN: Radial C6,7

ACTIONS: Extends the wrist, abducts the hand (radial)

Question 3

Extensor Carpi Radialis Brevis

Answer 3

PA: Lat epicondyle of humerus by CET, radial collateral ligament, adjacent inter muscular septum

DA: base of 3rd MC on dorsal aspect

INN: Radial C7,8

ACTIONS: Extends the wrist, abducts the hand (radial dev)

Question 4

Extensor Digitorum

Answer 4

PA: Lat epicondyle by CET, adjacent inter muscular septum & ante brachial fascia

DA: Dorsal digital expansions of lesser 4 digits

INN: Deep branch of radial C7, 8

ACTIONS: Extends the IP’s & MCP’s of the lesser 4 digits through dorsal expansion, wrist extension

Question 5

Extensor Digiti Minimi

Answer 5

PA: Lat epicondyle by CET & adjacent ante brachial fascia

DA: dorsal digital expansion of 5th digit

INN: Deep branch of the radial nerve C 7, 8

ACTIONS: Extends 5th digit & wrist

Question 6

Extensor Carpi Ulnaris

Answer 6

PA: Lat epicondyle by CET, post border of ulna, overlying ante brachial fascia

DA: Base of 5th MC at medially located tubercle

INN: Deep branch of the radial N. C7, 8

ACTIONS: Extends wrist, adducts the hand (ulnar dev)

Question 7

Anconeus

Answer 7

PA: post aspect of lat epicondyle

DA: annular ligament lat aspect of olecranon, proximal 1/4 of post surface of radial shaft

INN: Radial C6,7,8

ACTIONS: Assists in extending the elbow

Question 8

Supinator

Answer 8

PA: Lat epicondyle of humerus, radial collateral ligament, annular ligament, supinator crest of ulna

DA: Proximal 1/3 of radius along post & lat surfaces

INN: Deep branch of radial N. C6,7

ACTIONS: Supinates the FA

Question 9

Abductor Pollicis Longus

Answer 9

PA: Middle post shaft of ulna (distal to attach. of anconeus), interosseous membrane, middle 1/3 of post surface of radius (distal to supinator)

DA: base of 1st MC on radial side & trapezium

INN: Posterior interosseous N. C7, 8

ACTIONS: Abducts the thumb at 1st CMC joint

Question 10

Extensor Pollicis Brevis

Answer 10

PA

Question 11

Extensor Pollicis Longus

Answer 11

PA

Question 12

Extensor Indices

Answer 12

PA

Question 13

Abductor pollicis brevis

Answer 13

PA

Question 14

Opponens Pollicis

Answer 14

PA

Question 15

Flexor pollicis brevis

Answer 15

PA

Question 16

Palmaris Brevis

Answer 16

PA