Muscles of the Hand Review

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What are the intrinsic muscles of the hand?

"All For One And One For All": Abductor pollicis brevis (APB), Flexor pollicis brevis (FPB), Opponens pollicis (OP), Adductor pollicis (AP), Opponens digiti minimi (ODM), Flexor digiti minimi, (FDM) Abductor digiti minimi (ADM) (& lumbricals)

Which intrinsic muscles of the hand are innervated by the median n.?

2-LOAF: Lumbricals 1 & 2, Opponens pollicis, Abductor pollicis brevis and Flexor pollicis brevis

Dorsal interossei - function

Abduction and assists w/MCP flexion and extension of IP joints of digits II through V.

Abductor pollicis longus - function

Abduction and extension of CMC joint

Abductor Digiti Minimi - function

Abduction of digit V

Palmar interossei - function

Adduction, assistance w/MCP flexion and extension of IP joints of digits II through V

Adductor Pollicis - function

Adducts CMC joint of thumb

Extensor pollicis longus - function

Extension of IP joint of thumb

Extensor pollicis brevis - function

Extension of MCP and CMC joints of thumb

Extensor indicis proprius - function

Extension of MCP joint of the 2nd digit, contributes to extension of the IP joint

Extensor digiti minimi - function

Extension of MCP joint of the 5th digit, contributes to extension of the IP joints

Extensor digitorum communis - function

Extension of MCP joints, contributes to extension of IP joints

Flexor digitorum profundus - function

Flexion of DIP joint

Flexor Pollicis Longus - function

Flexion of IP joint of thumb

Flexor digiti minimi

Flexion of MCP joint and opposition of digit V

Flexor digitorum superficialis - function

Flexion of PIP joint

Lumbricals (1&2) - function

MCP flexion and extension of IP's

Lumbricals (3&4) - function

MCp flexion and extension of IP joints at digit IV and V

Lumbricals (1&2) - innervation

Median N.

Abductor Pollicis Brevis - innervation

Median n.

Flexor Pollicis Brevis - innervation

Median n.

Flexor Pollicis Longus - innervation

Median n.

Flexor digitorum superficialis - innervation

Median n.

Opponens Pollicis - innervation

Median n.

Flexor digitorum profundus - innervation

Median n. (II, III), ulnar n. (IV, V)

Which muscles make up the thenar eminence?

Opponens pollicis, Abductor pollicis brevis and Flexor pollicis brevis

Opponens Pollicis - function

Opposition

You have damaged your opponens pollicis. What will you not be able to do?

Opposition

Opponens digiti minimi - function

Opposition of digit V

Mnemonic for interossei functions

PADs = Palmar interossei ADDUCT DABs = Dorsal interossei ABDUCT

Abductor Pollicis Brevis - function

Palmar abduction

Abductor pollicis longus - innervation

Radial n.

Extensor digiti minimi - innervation

Radial n.

Extensor digitorum communis - innervation

Radial n.

Extensor indicis proprius - innervation

Radial n.

Extensor pollicis brevis - innervation

Radial n.

Extensor pollicis longus - innervation

Radial n.

Flexor Pollicis Brevis - function

Thumb MCP flexion, deep head innervated by ulnar n.

Abductor Digiti Minimi - innervation

Ulnar n.

Adductor Pollicis - innervation

Ulnar n.

Dorsal interossei - innervation

Ulnar n.

Flexor digiti minimi - innervation

Ulnar n.

Lumbricals (3&4) - innervation

Ulnar n.

Opponens digiti minimi - innervation

Ulnar n.

Palmar interossei - innervation

Ulnar n.


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