Anatomy-Lesson 19: Muscles of the Forearm and Hand
Abductor digiti minimi
A: Abducts 5th digit; In: Ulnar n.
Abductor pollicis longus
A: Abducts and extends thumb; In: Radial n.
Dorsal Interossei (4)
A: Abducts fingers; In: Ulnar n.
Palmar interossei (3 or 4)
A: Abducts fingers; In: Ulnar n.
Abductor pollicis brevis
A: Abducts thumb; In: Median n.
Opponens digiti minimi
A: Abducts, flexes, rotates 5th metacarpal; In: Ulnar n.
Opponens pollicis
A: Abducts, flexes, rotates first metacarpal; In: Median n.
Adductor pollicis
A: Adducts the thumb; In: Ulnar n.
Anconeus
A: Assists in forearm extension; In: Radial n.
Extensor carpi radialis brevis
A: Extends and abducts hand; In: Radial n.
Extensor carpi radialis longus
A: Extends and abducts hand; In: Radial n.
Extensor carpi ulnaris
A: Extends and adducts hand; In: Radial n.
Extensor digiti minimi
A: Extends digiti mini and wrist; In: Radial n.
Extensor digitorum
A: Extends fingers, extends wrist; In: Radial n.
Extensor pollicis brevis
A: Extends thumb; In: Radial n.
Extensor pollicis longus
A: Extends thumb; In: Radial n.
Flexor digiti minimi brevis
A: Flexes 5th digit; In: Ulnar n.
Flexor digitorum superficialis
A: Flexes digit 2-5 and flexes wrist; In: Median n.
Flexor digitorum profundus
A: Flexes digit 2-5 and flexes wrist; In: Ulnar 1/2 by ulnar n.; rest by median n.
Flexor pollicis longus
A: Flexes first digit and flexes wrist; In: Median n.
Brachioradialis
A: Flexes forearm (elbow); In: Radial n.
Flexor pollicis brevis
A: Flexes thumb; In Median n.
Flexor carpi ulnaris
A: Flexes wrist and adducts hand; In: Ulnar n.
Flexor carpi radialis
A: Flexes wrist; In: Median n.
Palmaris longus
A: Flexes wrist; In: Median n.
Extensor indicis
A: Helps extend index finger; In: Radial n.
Pronator teres
A: Pronates forearm and flexes elbow; In: Median n.
Pronator quadratus
A: Pronates forearm; In: Median n.
Supinator
A: Supinates forearm; In: Radial n.
Palmaris brevis
A: Wrinkles skin, may help protect ulnar n. and a; In: Ulnar n.
Muscles of hand:
Abd pol b, Opp pol, Flex pol b, Add pol, Abd dig min, Flex dig min b, Opp dig min, 1st lumbrical m. , flex ret
Function of dorsal interossei
Abduct digits
Function of palmar interossei
Adducts digits
Muscles of posterior forearm: superficial group
Brachioradialis, Ext. carpi radialis l, Ext. carpi radialis br, Ext. digitorum, Ext. dig min Ext. carpi ulnaris, Ext. ret
Lumbricals (4)
Flex MP joints 2-5; extend IP 2-5;In: Median n. 1 & 2; Ulnar n.=3&4
Deep muscles of the anterior forearm
Flexor digitorum profundus, Flexor pollicis longus, Pronator quadratus, Supinator
Fleshy mound at the base of little finger?
Hypothenar eminence
What muscles are found between the metacarpal bones?
Interossei bellies
Anterior Forearm: Superficial muscles
Pronator teres, Flexor carpi radialis, Palmaris longus, Flexor carpi ulnaris, Flexor digitorum superficialis, Flexor retinaculum, Palmar aponeurosis
Muscles of posterior forearm:
Supinator, Abd pol b, Ext. pol l, Extensor indicis.
Fleshy mound at the base of the thumb?
Thenar eminence
