Muscles of the Hand Review
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.
