Hand Anatomy: Intrinsic and Extrinsic
What are the Intrinsic Muscles innervated by the median nerve?
(1) Abductor Pollicis brevis (2)Opponens pollicis (3)Flexor Pollocis brevis: superficial head (4) Lumbricals (radial side)
What are the Intrinsic muscles innervated by the ulnar nerve?
(1) Abductor digiti minimi (2) Opponens digiti minimi (3)Flexor Digiti minimi (4) Lumbricals (ulnar side) (5) Palmer interossei (6) Dorsal interossei
What are the extrinsic extensor muscles of the hand innervated by the radial nerve?
(1) Extensor digitorum communis (EDC) (2) Extensor Digiti Minimi (EDM) (3) Extensor indicis proprius (EIP) (4) Extensor Pollicis Longus (EPL) (5) Extensor Pollicis Brevis (EPB) (6) Abductor Pollicis Longus (APL)
What are the extrinsic flexors of the hand innervated by the ulnar nerve?
(1) Flexor digitorum profundus (ONLY ONE!! :) )
What are the extrinsic flexor muscles of the hand innervated by the median nerve?
(1) Flexor digitorum superficialis (sublimis) (FDS) (2)Flexor digitorum profundus (FDP) (3)Flexor Pollicis Longus (FPL)
What is the function of the Dorsal Interossei?
Abduction and assist with MCP flexion and extension of IP joints of digits II through V.
What is the function of the Abductor pollicis longus (APL)?
Abduction and extension of CMC joint.
What is the function of Abductor digiti minimi?
Abduction of the 5th digit
What is the function of the Palmer Interossei?
Adduction and assistance with MCP flexion and extension of IP joints of digits II through V
What is the function of the Extensor pollicis longus (EPL)?
Extension of IP joint of the thumb
What is the function of the Extensor Pollicis brevis (EPB)?
Extension of MCP and CMC joints of the thumb
What is the function of the Extensor indicis proprium (EIP)?
Extension of the MCP joint of the 2nd digit and contributes to extension of the IP joints
What is the function of the Extensor Digiti Minimi (EDM)?
Extension of the MCP joint of the 5th digit and contributes to extension of the IP joints
What is the function of the Extensor Digitorum Communis (EDC)?
Extension of the MCP joints and contributes to extension of the IP joints
What is the function of the flexor digitorum profundus (FDP)?
Flexion of DIP joints to digits II and III (ulnar nerve innervates digits IV and V)
What is the function of Flexor digitorum profundus?
Flexion of DIP joints to digits IV and V.
What is the function of flexor pollicis longus (FPL)?
Flexion of the IP joint of the thumb
What is the function of flexor digiti minimi?
Flexion of the MCP joint and opposition of the 5th digit
What is the function of flexor digitorum superficialis (FDS)?
Flexion of the PIP joints
What is the function of the lumbricals?
MCP flexion and extension of IP Joints
What is the function of the Lumbricals (ulnar side)?
MCP flexion and extension of the IP joints of digits IV and V
What is the function of opponens pollicis?
Opposition
What is the function of Opponens digiti minimi?
Opposition of the 5th digit
What is the function of Abductor pollicis brevis?
Palmer Abduction
What is the function of Flexor Pollicis brevis?
Thumb MCP flexion, deep head innervated by ulnar nerve
