Muscles of the forearm- anterior and posterior compartment Flashcards
Anterior compartment muscles- superficial group (5)
pronator teres, flexor capri radialis, palmares longus, flexor digitorum superficialis, flexor capri ulnaris
anterior compartment muscles- deep group
flexor digitorum profundas, flexor pollicis longus, pronator quadratus
movements of radio ulnar joint
pronation- pronator teres and quadratus, brachioradialis
supination- supinator, bicep brachii, brachioradialis
movements of wrist- radoiocarpal and midcarpal joint- flexion and extension
flexion- flexor capri radialis, FCU
extension- ECRL, EXRB, and ECU
movements of wrist- radoiocarpal and midcarpal joint- radial deviation and ulna deviation
radial deviation- FCR, ECRDL, ECRB
ulna deviation- FCU, ECU
Superficial flexors- lateral to medial
pronator teres, FCR, palmaris longus, FDS, FCU
Flexor capri radialis- origin and insertion
origin- medial epicondyle of humerus (CFT) to palmer surface of base of MC 2 and 3
Flexor capri radialis- nerve supply and action
median nerve C7, 8
Action- flexion and abduction
palmaris longus- origin and insertion
Medial epicondyle of humerus, to flexor retianculum and plantar aponeurosis
palmaris longus- nerve supply and action
median nerve C7, 8 and weak wrist flexion and tighten palmer fascia
flexor capri ulnaris- origin and insertion
origin- medial epicondyle of humerus, insertion pisiform and hook of hamate and base of MC 5
flexor capri ulnaris- nerve supply and action
ulna nerve C7,8
flexion and adduction at wrist joint, synergist action in abduction of digit 5
movement of the digits
flexion of fingers- FDS and FDP
flexion at thumb- flexor pollicis longus
flexor digitorum superficialis- origin and insertions
origin- medial epicondyle of humerus and coronoid process of ulna, and proximal anterior border of radius
insertion- attach by 4 tendons to either side palmer surface of muscle phalanx of each finger
flexor digitorum superficialis- nerve supply and action
median nerve C7,8
flexion at wrist, MTP, PIP
deep flexor- from lateral to medial (3)
flexor pollicis longus, flexor digitorum profundus, pronator quadratus
flexor digitorum profundas- origin and insertion
origin- medial side of coronoid process, anterior and medial surface of ulna and IM
insertion- attach by 4 tendons- base of palmer surface pf distal phalanx of each finger
flexor digitorum profundas- NS and action
NS- anterior interosseous nerve C7,8, T1-2 (radial digits) and ulna nerve C8, T1 (ulna digits)
flexion at DIP, PIP, MCP and wrist joint
flexor pollicis longus origin and insertion
origin- anterior surface of radius and IM, insertion- palmer surface of distal phalanx of thumb
flexor pollicis longus- NS and action
anterior interosseous nerve C8, T1
action- flexion at CMC, MCP and IP joint of thumb
what is the carpal tunnel (and 4 anchor points)
a tough band of fibrous CT- 4 anchor points- high points of proximal (scaphoid and pisiform) and distal carpal bones (tubercle of trapezium and hook of hamate
floor of carpal tunnel
square of tough fibrous tissue which gives roof to carpal tunnel
contents of carpal tunnel
9 tendons- 4 of FDS, 4 of FDP, FPL, median nerve
posterior compartment superficial group (6)
brachioradialis, ECRL, ECRB, ED, EDM, ECU
posterior compartment deep group (5)
supinator, abductor pollicis longus, EPL, EPB, Extensor indices
superficial group posterior compartment- lateral to medial
brachioradialis, ECRL, ECRB, ED, EDM, ECU
ECRL- Origin and insertion
from- lateral supracondylar ridge of humerus
insertion- posterior surface base of MC 2
ECRL- NS and action
NS- median nerve C7,8
Action- extension and abduction
ECRB- origin and insertion
Origin- lateral epicondyle of humerus
insertion- posterior surface base of MC 3
ECRB- NS and action
NS- posterior interosseous nerve C6,7
Action- extension and abduction
Extensor capri ulnaris- origin and insertion
lateral epicondyle of humerus- by shared aponeurosis from posterior border of ulna
to- medial side of base of MC 5
Extensor capri ulnaris- NS and action
NS- posterior interosseous nerve C7,8
action- extension and adduction of hand at wrist
extension of digits
extension of fingers- ED, EDM, EI
Extension of thumb- EPL/B
Abduction- APL
extensor digitorum- origin and insertion
origin- lateral epicondyle of humerus
insertion- attach by 4 tendons- base of middle and distal phalanges of each finger (DDE)
extensor digitorum- NS and action
NS- posterior interosseous nerve C7,8
Action- extension of MCP and IP joint
dorsal digital expansion
tendon of ED divides into 2 lateral slips which terminate in base of distal phalanx, central slip through tunnel to middle phalanx
extensor digiti minimi- origin and insertion
origin- lateral epicondyle of humerus, insertion- dorsal digital expansion of digit 5
extensor digit minimi- NS and action
NS- posterior interosseous nerve C7,8
action- extension at MCP joint of little finger and extension of IP joints
deep extensors- posterior compartment- lateral to medial
supinator, APL, EPL, EPB, EI
extensor indices- origin and insertions
origin- posterior surface of the distal ulna and interosseous membrane
insertion- DDE of index finger
extensor indices- NS and action
NS- posterior interosseous nerve C6,7
action- extension of IP and MCP joints of index finger
Extensor pollicis longus- Origin and insertion
posterior surface of middle third of ulna and interosseous membrane
to dorsal surface of base of distal phalanx of thumb
Extensor pollicis longus- NS and actions
posterior interosseous nerve C6,7
Action- extension at IP joint, assist extension at MCP, CMC and wrist joint
extensor pollicis brevis- origin and insertions
origin- posterior aspect of ulna and IM
to- dorsal surface of base of proximal phalanx of thumb
extensor pollicis brevis- NS and action
NS- posterior interosseous nerve C7,8
Action- extension of MCP and CMC joints of thumb
abductor pollicis longus- origin and insertion
origin- posterior surface of upper ulna and middle radius and IM
to radial side of base of MC 1
abductor pollicis longus- NS and action
NS- posterior interosseous nerve C7,8
Action- assist extension and abduction at 1st CMC joint, assist abduction at wrist
flexion at wrist
FCU, FCR, FDS, PL, FDP, FPL
Extension at wrist
ECRL, ECRB, ECU, extensor digitorum, EDM, EPL, EI, EPB
radial deviation
FCR, ECRL, ECRB, APL, EPB
Ulna deviation
FCU, ECU
Ulna nerve- 2
FCU, medial half of flexor digitorum profundas
median nerve- 4
Pronator teres, FCR, PL, FDS
anterior intreosseous nerve
lateral half of flexor digitorum profundas
radial nerve- 2
brachioradialis, ECRL
posterior interosseous nerve
ECRB, ECU, ED, EDM, EI, EPL, EPB, APL
