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Muscles of the Wrist & Hand

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jekezabu's version from 2016-10-18 15:39

muscles acting on the wrist

Question Answer
extensor carpi radialis longus - innervationradial nerve
extensor carpi radialis longus - actionextends & aBducts (radial deviation) wrist
extensor carpi radialis longus - originlateral supracondyle of humerus
extensor carpi radialis longus - insertionbase of 2nd metacarpal
extensor carpi radialis brevis - innervationdeep branch of radial nerve
extensor carpi radialis brevis - actionextends wrist
extensor carpi radialis brevis - originlateral epicondyle of humerus
extensor carpi radialis brevis - insertionbase of 3rd metacarpal
extensor carpi ulnaris - innervationposterior interosseous nerve
extensor carpi ulnaris - actionextends & aDducts (ulnar deviation) wrist
extensor carpi ulnaris - originlateral epicondyle of humerus
extensor carpi ulnaris - insertionbase of 5th metacarpal
flexor carpi radialis - innervationmedian nerve
flexor carpi radialis - actionflexes hand & aBducts wrist
flexor carpi radialis - originmedial epicondyle of humerus
flexor carpi radialis - insertionbase of 2nd metacarpal
flexor carpi ulnaris - innervationulnar nerve
flexor carpi ulnaris - actionflexes & aDducts wrist
flexor carpi ulnaris - originmedial epicondyle of humerus
flexor carpi ulnaris - insertionpisiform, hook of hamate, 5th metacarpal
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muscles acting on the digits & thumb (Extrinsic)

Question Answer
flexor digitorum superficiais (FDS) - innervationmedian nerve
flexor digitorum superficiais (FDS) - actionflexes posterior interphalangeal (PIP) joint, assists in metacarpophalangeal (MP) flexion
flexor digitorum superficiais (FDS) - originmedial epicondyle of humerus
flexor digitorum superficiais (FDS) - insertionbase of middle phalanges of digits 2-5
flexor digitorum profundus (FDP) - innervation (medial part)ulnar nerve
flexor digitorum profundus (FDP) - innervation (lateral part)anterior interosseous nerve
flexor digitorum profundus (FDP) - actionflexes distal interphalangeal (DIP) joints of digits
flexor digitorum profundus (FDP) - originproximal ulna & interosseous membrane
flexor digitorum profundus (FDP) - insertionbases of distal phalanges of digits 2-5
extensor digitorum (ED/EDC) - innervationposterior interosseous nerve
extensor digitorum (ED/EDC) - actionextends metacarpophalangeal (MP) joints of digits, assists in extension of interphalangeal (IP) joints
extensor digitorum (ED/EDC) - originlateral epicondyle of humerus
extensor digitorum (ED/EDC) - insertionextensor expansion of digits
extensor indicis (EI) - innervationposterior interosseous nerve
extensor indicis (EI) - actionextends 2nd digit at metacarpophalangeal (MP) joint
extensor indicis (EI) - attachmentsposterior ulna & interosseous membrane --> extensor expansion of 2nd digit
extensor digiti minimi (EDM) - innervationposterior interosseous nerve
extensor digiti minimi (EDM) - actionextends metacarpophalangeal (MP) joint of 5th digit, assists in extension of interphalangeal (IP) joints
extensor digiti minimi (EDM) - attachmentslateral epicondyle of humerus --> extensor expansion of 5th digit
extensor pollicis longus (EPL) - innervationposterior interosseous nerve
extensor pollicis longus (EPL) - actionextends interphalangeal (IP) joint of thumb
extensor pollicis longus (EPL) - attachmentsposterior ulna & interosseous membrane --> base of distal phalanx of thumb
extensor pollicis brevis (EPB) - innervationposterior interosseous nerve
extensor pollicis brevis (EPB) - actionextends metacarpophalangeal (MP) and carpometacarpal (CMC) joints of thumb
extensor pollicis brevis (EPB) - attachmentsposterior distal radius --> base of proximal phalanx of thumb
abductor pollicis longus (APL) - innervationposterior interosseous nerve
abductor pollicis longus (APL) - actionaBducts thumb at carpometacarpal (CMC) joint
abductor pollicis longus (APL) - attachmentsposterior proximal radius --> base of 1st metacarpal
flexor pollicis longus - innervationanterior interosseous nerve
flexor pollicis longus - actionflexes interphalangeal (IP) joint of thumb
flexor pollicis longus - attachmentsanterior radius --> base of distal phalanx of thumb
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Muscles acting on the Digits & Thumb (Intrinsic)

Question Answer
lumbricals 1-2 - innervationmedian nerve
lumbricals 1-2 - actionflexes metacarpophalangeal (MP) joints,
extends interphalangeal (IP) joints
lumbricals 1-2 - attachmentslateral aspect of tendons of flexum digitorum profundus (FDP)
--> lateral aspect of extensor expansions of digits 2 & 3
lumbricals 3-4 - innervationulnar nerve
lumbricals 3-4 - actionflexes metacarpophalangeal (MP) joings,
extends interphalangeal (IP) joints
lumbricals 3-4 - attachmentsflexum digitorum profundus (FDP) tendons of digits 3-5
--> flexum digitorum superficialis (FDS) tendons,
extensor expansions of digits 4 & 5
dorsal interossei 1-4 - innervationulnar nerve
dorsal interossei 1-4 - actionaBducts digits from axial line,
assists in flexing metacarpophalangeal (MP) and extending interphalangeal (IP) joints of digits
dorsal interossei 1-4 - attachmentsadjacent sides of metacarpals
--> extensor expansions and bases of digits 2-4
palmar interossei 1-3 - innervationulnar nerve
palmar interossei 1-3 - actionaDducts digits toward axial line,
assists in flexing metacarpophalangeal (MP) and extending interphalangeal (IP) joints
palmar interossei 1-3 - attachmentspalmar side of metacarpals 2,4,5,
--> bases of proximal phalanges, extensor expansions of digits 2,4,5
adductor pollicis - innervationulnar nerve
adductor pollicis - actionaDducts thumb toward middle digit at carpometacarpal (CMC) joint
adductor pollicis - attachments (oblique head)bases of metacarpals 2&3 and adjacent carpals
--> medial aspect of proximal phalanx of thumb
adductor pollicis - attachments (transverse head)shaft of 3rd metacarpal
--> medial aspect of proximal phalanx of thumb
abductor pollicis brevis - innervationrecurrent branch of median nerve
abductor pollicis brevis - actionaBducts thumb at carpometacarpal (CMC),
assists in opposition
abductor pollicis brevis - attachmentsflexor retinaculum, scaphoid & trapezium
--> lateral side of the proximal phalanx of thumb
flexor pollicis brevis - innervationrecurrent branch of median nerve
flexor pollicis brevis - actionflexes thumb at interphalangeal joint
flexor pollicis brevis - attachmentsflexor retinaculum, scaphoid & trapezium
--> lateral side of proximal phalanx of thumb
opponens policis - innervationrecurrent branch of median nerve
opponens policis - actionopposes thumb,
rotates thumb medially
opponens policis - attachmentsflexor retinaculum, scaphoid & trapezium
--> lateral side of 1st metacarpal
abductor digiti minimi - innervationulnar nerve
abductor digiti minimi - actionabducts 5th digit
abductor digiti minimi - attachmentspisiform bone
--> base of proximal phalanx of 5th digits, medial side
flexor digiti minimi brevis - innervationulnar nerve
flexor digiti minimi brevis - actionflexes metacarpophalangeal (MCP) joint of 5th digit
flexor digiti minimi brevis - attachmentsflexor retinaculum, hook of hamate
--> base of proximal phalanx of 5th digit
opponens digiti minimi - innervationulnar nerve
opponens digiti minimi - actionopposes 5th digit to thumb
opponens digiti minimi - attachmentsflexor retinaculum, hook of hamate
--> medial order of 5th metacarpal
memorize