(FOREARM) Forearm Muscles Exam: attachments, movements, nerve innervation Flashcards
(43 cards)
SUPERFICIAL (FIRST LAYER) ANTERIOR COMPARTMENT OF FOREARM
- FLEXORS-
Pronator Teres M.
Flexor Carpi Radialis M. (FCR)
Palmaris Longus M.
Flexor Carpi Ulnaris M.(FCU)
Pronator Teres M.
(Superficial)
A: (CFT) Coronoid process, medial epicondyle of humerus to middle convexity of lateral radius
Mvmnt: Pronates and flexes forearm
Nerve: Median Nerve
Flexor Carpi Radialis M. (FCR) (Superficial)
A:(CFT)Medial epicondyle of humerus, base of 2nd metacarpal
Mvmnt: Flexes and abducts hand
Nerve: Median Nerve
Palmaris Longus M. (Superficial)
A: (CFT)Medial epicondyle of humerus, distal half of flexor retinaculum and apex of palmar aponeurosis
Mvmnt: Flexes hand at wrist and tenses aponeurosis
Nerve: Median Nerve
Flexor Carpi Ulnaris M. (FCU)(Superficial)
A:(CFT)Medial epicondyle of humerus to pisiform, hook of hamate, 5th metacarpal
Mvmnt: Flexes and adducts hand at wrist
Nerve: Ulnar Nerve
INTERMEDIATE (SECOND LAYER) ANTERIOR COMPARTMENT OF FOREARM
-FLEXORS-
Flexor Digitorum Superficialis M. (FDS)
Flexor Digitorum Superficialis M. (Intermediate)
A: (CFT)Medial epicondyle of humerus and superior half of anterior border to shaft of middle phalanges of medial four digits.
Mvmnt: Flexes middle phalanges of proximal interphalangeal joints of middle four digits AND flexes proximal phalanges at metacarpophalangeal joints
Nerve: Median Nerve
DEEP (THIRD LAYER) ANTERIOR COMPARTMENT OF FOREARM
-FLEXORS-
Flexor Digitorum Profundus M. (FDP)
Flexor Pollicis Longus M. (FPL)
Pronator Quadratus M.
Flexor Digitorum Profundus M. (Deep)
A:Proximal three quarters of medial and anterior surfaces of ulna and interosseous membrane
MEDIAL:Base of distal phalanges 4th and 5th digits
LATERAL: Base of distal phalanges 2nd and 3rd digits
Mvmnt:
MEDIAL:Flexes distal phalanges 4+5 at distal interphalangeal joints
LATERAL: Flexes distal phalanges 2+3 at distal interphalangeal joints
nerve
Nerve:
MEDIAL: Ulnar Nerve
LATERAL: Anterior Interosseous Nerve from Median Nerve
Flexor Pollicis Longus M. (Deep)
A: Anterior Surface of radius and adjacent interosseous membrane to base of distal phalanx of thumb
Mvmnt: Flexes phalanges of 1st digit (thumb)
at !!!!!
-interphalangeal jt
metacarpophalangeal jt
carpometacarpal jt
Nerve: Anterior Interosseous Nerve from Median Nerve
Pronator Quadratus M. (Deep)
A: Distal quarter of anterior surface of ulna, to distal quarter of anterior surface of radius
Mvmnt: Pronates forearm , deep fibers bind radius and ulna together
Nerve: Anterior Interosseous Nerve from Median Nerve
SUPERFICIAL POSTERIOR COMPARTMENT OF FOREARM
-EXTENSORS-
Brachioradialis M.
Extensor Carpi Radialis Longus M. (ECRL)
Extensor Carpi Radialis Brevis M. (ECRB)
Extensor Digitorum M.
Extensor Digiti Minimi M. (EDM)
Extensor Carpi Ulnaris M. (ECU)
Brachioradialis M. (Superficial)
A:Proximal two-thirds of supra-epicondylar ridge of humerus to lateral surface of distal end radius proximal to styloid process
Mvmnt: Weak flexion of forearm maximal when mid-pronated position
Nerve: Radial Nerve
Extensor Carpi Radialis Longus M. (ECRL) (Superficial)
A: Lateral supra-epicondylar ridge of humerus to dorsal aspect of base 2nd metacarpal
Mvmnt: Extend and abduct hand at wrist joint ERCL active during wrist extension
Nerve: Radial Nerve
Extensor Carpi Radialis Brevis M. (ECRB) (Superficial)
A:(CET) Lateral epicondyle ridge of humerus to dorsal aspect of base 3rd metacarpal
Mvmnt: Extend and abduct hand
Nerve: Deep Branch of Radial Nerve
Extensor Digitorum M. (Superficial)
A:(CET)Lateral epicondyle of humerus to extensor expansions of medial four digits
Mvmnt: Extends medial four digits primarily at metacarpophalangeal joints secondarily at interphalangeal joints
Nerve: Deep Branch of Radial Nerve
Extensor Digiti Minimi M. (EDM)(Superficial)
A:(CET) Lateral epicondyle of humerus to extensor expansion of 5th digit
Mvmnt: Extends 5th digit primarily at metacarpophalangeal joints secondarily at interphalangeal joints
Nerve: Deep Branch of Radial Nerve
Extensor Carpi Ulnaris M. (ECU) (Superficial)
A: (CET)Lateral epicondyle of humerus, posterior boarder of ulna via shared aponeurosis to dorsal aspect of base of 5th metacarpal
Mvmnt: Extends and adducts hand at wrist joint (also active during fist clenching)
Nerve: Deep Branch of Radial Nerve
DEEP POSTERIOR COMPARTMENT OF FOREARM
-EXTENSORS-
Supinator M.
Extensor Indicis M.
Supinator M. (Deep)
A: Lateral epicondyle of humerus , radial collateral and anular ligaments supinator fossa, crest of ulna to the proximal third of radius (tendon wraps around radial bone, anteriorly)
Mvmnt: supinates forearm, rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)
Nerve:Deep branch of radial Nerve
Extensor Indicis M. (Deep)
A: Posterior surface of distal third of ulna and interosseous membrane to extensor expansion of 2nd digit
Mvmnt: Extends 2nd digit (enabling its independent extension) helps extends hand at wrist
Nerve: Posterior Interosseous Nerve (continuation of deep branch of radial nerve)
OUTCROPPING MUSCLES OF POSTERIOR COMPARTMENT OF FOREARM
Abductor Pollicis Longus M. (APL)
Extensor Pollicis Brevis M. (EPB)
Extensor Pollicis Longus M. (EPL)
Abductor Pollicis Longus M. (Outcropping)
A: Posterior Surface of proximal halves of ulna , radius , and interosseous membrane to base of 1st metacarpal
Mvmnt: Abducts thumb and extends it at carpometacarpal joint
Nerve: Posterior Interosseous Nerve (continuation of deep branch radial of nerve)
Extensor Pollicis Brevis M. (EPB) (Outcropping)
A: Posterior Surface of distal third of radius and interosseous membrane to dorsal aspect of base proximal phalanx of thumb
Mvmnt: Extends proximal phalanx of thumb at metacarpophalangeal joint, extends carpometacarpal joint
Nerve:Posterior Interosseous Nerve (continuation of deep branch radial of nerve)
