Deep forearm extensors

Question 0

EXTENSOR INDICIS

Answer 0

ORIGIN: Posterior ulna

INSERTION: Extensor digitorum tendon to index finger

INNERVATION: Radial Nerve (C7-8)

Question 1

ABDUCTOR POLLICIS LONGUS

Answer 1

ORIGIN: Posterior ulna and radius

INSERTION: Base of the 1st metacarpal

INNERVATION: Radial Nerve (C7-8)

Question 2

EXTENSOR POLLICIS BREVIS

Answer 2

ORIGIN: Posterior radius

INSERTION: Proximal phalanx of the thumb

INNERVATION: Radial Nerve (C7-8)

Question 3

EXTENSOR POLLICIS LONGUS

Answer 3

ORIGIN: Posterior middle 1/3 of the ulna

INSERTION: Distal phalanx of the thumb

INNERVATION: Radial Nerve (C7-8)

Question 4

SUPINATOR

Answer 4

ORIGIN: Common extensor tendon, annular ligament

INSERTION: Proximal shaft of radius

INNERVATION: Radial Nerve (C5-6)

Question 5

PALMARIS BREVIS

superficial hand

Answer 5

ORIGIN: Medial border of the palmar aponeurosis

INSERTION: Skin over the ulnar border of the hand

INNERVATION: Ulnar Nerve (C8T1)

ACTION: Stabilize the palmar skin during gripping.