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Cheatography

Hand Muscles Cheat Sheet (DRAFT) by

Hand muscles and stuff and sheeet

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Anatomical Snuffbox

Abductor Pollicis Longus

Orig­in: Posterior surface of the shaft of the ulna + middle 1/3rd of posterior surface of the radius
Inse­rti­on: Radial side of the 1st metacarpal base + trapezium
Nerve: Posterior intero­sseous Nerve (radial) - (C7-8)
Acti­on: Abducts the wrist joint and assists in abducting the thumb - extends the thumb with pollicis extensors at the carpom­eta­carpal joint

TrPs

- Can mimic deQuer­vain's tenosy­novitis and superf­icial radial nerve irritation

Abductor Pollicis Brevis

Orig­in: Proxim­ola­teral part of the thenar eminence + flexor retina­culum, scaphoid bone and trapezium
Inse­rti­on:
Medial fibres: Radial side of the base of the proximal phalanx of the thumb
Lateral Fibres: Dorsal digital expansion of the thumb
Nerve: Lateral Terminal branches of the median nerve (C8-T1)
Acti­on: Draws thumb in

TrPs

Flexor Pollicis Brevis

Orig­in: Supe­rfi­cial: Distal border of the flexor retina­culum & distal tubercle of the trapezium Deep: Trapezoid & capitate & palmar ligaments of the distal row of carpal bones
Inse­rti­on: Supe­rfi­cial: Radial sides of the base of the proximal phalanx of the thumb Deep: Sesamoid bone and base of the 1st phalanx
Nerve: Supe­rfi­cial: Lateral terminal branch of the median nerve Deep: Deep branch of the ulnar nerve (C8-T1)
Acti­on: Flexes the MCP Joint

Opponens Pollicis

Orig­in: Tubercle of the trapezium and flexor retina­culum
Inse­rti­on: Lateral border and adjoining lateral half of the palmar surface of the metacarpal bone of the thumb
Nerve: Lateral Terminal Branch of the median nerve C8-T1 + Branch of the deep terminal branch of the ulnar nerve
Acti­on: Flexes the metacarpal joint of the thumb and assists in opposition

TrPs

Adductor Pollicis

Orig­in:
Obli­que: Capitate, bases of 2nd and 3rd metaca­rpal, palmar ligaments of the carpus and sheath of the tendon of FCR
Transverse: Anterior body of the 3rd metacarpal
Inse­rti­on: Medial side of the base of the proximal phalanx of the thumb + ulnar sesamoid
Nerve: Deep branch of the ulnar nerve (T1)
Acti­on: Adduct thumb at CMC Joint

TrPs

- Weeders are suscep­tible - TrPs in APB, FPB + OP
- Deep tenderness in the web of the thumb could be from scalenes, brachi­alis, ECRB or Brachi­ora­dialis

Abductor Digiti Minimi

Orig­in: Pisiform, tendon of FCU + pisohamate ligament
Inse­rti­on: Ulnar side of the base of the proximal phalanx of the little finger, ulnar border of dorsal digital expansion of EDM
Nerve: Deep branch of ulnar nerve (C8-T1)
Acti­on: Abduction of the 5th digit from the 4th

TrPs

Flexor Digiti Minimi Brevis

Orig­in: Convex surface of the hook of the hamate + palmar surface of the flexor retina­culum
Inse­rti­on: Ulnar side of the base of the proximal phalanx of the little finger
Nerve: Deep branch of ulnar nerve (C8-T1)
Acti­on: Flexion of the little finger at the MCP Joint

Opponens Digiti Minimi

Orig­in: Convexity of the hook of the hamate + flexor retina­culum
Inse­rti­on: Whole length of ulnar margin of the 5th metacarpal bone and adjacent palmar surface
Nerve: Deep branch of the ulnar nerve (C8-T1)
Acti­on: Flexion of the 5th metacarpal + assists in opposition

TrPs

Palmar Interossei

Orig­in: Palmar surfaces of metacarpal bones
Inse­rti­on: Bases of proximal phalanges
Nerve: Deep branch of the ulnar nerve (C8-T1)
Acti­on: Adduction of the fingers - grip

Dorsal Interossei

Orig­in: Metaca­rpals
Inse­rti­on: Proximal phalanges + extensor expansion
Nerve: Deep branch of ulnar nerve C8-T1
Acti­on: Abduction of the fingers - grip

Lumbricals

Orig­in: Flexor digitorum profundus (radial side)
Inse­rti­on: Extensor expansion
Nerve: 1st and 2nd - median nerve (C8-T1), 3rd and 4th - Deep terminal branch of the ulnar nerve (C8-T1)
Acti­on: Flexion of MCP joints while extending both interp­hal­angeal joints of the digit - upstroke in writing

Hypothenar and Interr­ossei palpation

Finger muscle Relaxation Exercise

- Good for patient's having problems with overac­tivated finger flexors by prolonged gripping
- Advice: Relax grip frequently
Pronate hand rather than hold in supination
Frequently stretch the flexor muscles
- TrPs can be treated by exercises:
Artisan's stretch and finger flutter
Passive finger extension exercise
Intero­sseous muscle stretch

Exercises

       

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