Antebrachial Muscles Flashcards
What is the common proximal attachment of the superficial muscles in the anterior compartment of the antebrachium?
Medial epicondyle of the humerus
What is the common innervation of the superficial muscles in the anterior compartment of the antebrachium?
Median and ulnar nerve
What is the common action of the superficial muscles in the anterior compartment of the antebrachium?
Flexion of the wrist and digits
What is the proximal attachment of the flexor digitorum superficialis?
- humero-ulnar head
- radial head
What is the distal attachment of the flexor digitorum superficialis?
Shafts of middle phalanges of digits II-V
What innervates the flexor digitorum superficialis?
Median nerve
What are the actions of the flexor digitorum superficialis?
Independent flexion of the middle phalanges of digits II-V
Flexion of proximal phalanges by continued action
What is the proximal attachment of the flexor digitorum profundus?
Proximal two thirds of anterior ulna
Interosseous membrane
What is the distal attachment of the flexor digitorum profundus?
Distal phalanges of digits 2-5
What innervates the flexor digitorum profundus?
Median nerve via anterior interosseous nerve
Ulnar nerve
What are the actions of the flexor digitorum profundus?
Flexion of the DIP joints of digits 2-5
What is the blood supply of the flexor digitorum profundus?
Anterior interosseous artery
What is the proximal attachment of the flexor pollicus longus?
- mid-anterior surface of the radius
- interosseous membrane
What is the distal attachment of the flexor pollicus longus?
-distal phalanx of thumb
What innervates the flexor pollicus longus?
-median nerve
What are the actions of the flexor pollicis longus?
-flexion of distal phalanx of thumb
What is the common proximal origin of the superficial muscles in the posterior compartment of the antebrachium?
-lateral epicondyle of the humerus
What is the common action of the superficial muscles in the posterior compartment of the antebrachium?
-wrist and/or hand extension
What is the common innervation of the superficial muscles in the posterior compartment of the antebrachium?
-radial nerve via deep branch of radial nerve or posterior interosseous nerve
What is the proximal attachment of the brachioradialis?
-proximal two thirds of the supraepicondylar ridge of humerus
What is the distal attachment of the brachioradialis?
-distal radius proximal to styloid process
What innervates the brachioradialis?
-radial nerve
What is the blood supply of the brachioradialis?
-radial artery and branches
What are the actions of the brachioradialis?
-flexion of the forearm when pronated
What is the proximal attachment of the extensor carpi radialis longus?
-lateral supracondylar ridge of the humerus
What is the distal attachment of the extensor carpi radialis longus?
-dorsal base of second metacarpal
What innervates the extensor carpi radialis longus?
-radial nerve
What is the blood supply of extensor carpi radialis longus?
- radial artery and branches
- interosseous artery branches
What are the actions of the extensor carpi radialis longus?
-extension and abduction of the hand at the wrist
What is the proximal attachment of the extensor carpi radialis brevis?
-lateral epicondyle of humerus
What is the distal attachement of the extensor carpi radialis brevis?
-dorsal base of third metacarpal
What innervates the extensor carpi radialis brevis?
-deep branch of radial nerve
What is the blood supply of the extensor carpi radialis brevis?
- branches of the radial artery
- branches of the interosseous artery
What are the actions of the extensor carpi radialis brevis?
-extension and abduction of the hand at the wrist
What is the proximal attachment of the extensor digitorum?
-lateral epicondyle of the humerus
What is the distal attachment of the extensor digitorum?
-extensor expansions of digits 2-5
What innervates the extensor digitorum?
-posterior interosseous nerve
What is the blood supply of the extensor digitorum?
-branches of the interosseous artery
What are the actions of the extensor digitorum?
- extends digits 2-5 at MCP
- somewhat extends digits 2-5 interphalageal joints
What is the proximal attachment of the extensor digiti minimi?
-lateral epicondyle of the humerus
What is the distal attachment of the extensor digiti minimi?
-extensor expansion of fifth digit
What innervates the extensor digiti minimi?
-posterior interosseous nerve
What is the blood supply of the extensor digiti minimi?
-branches of the interosseous artery
What are the actions of the extensor digiti minimi?
- extension of the fifth digit at the MCP joint
- somewhat extends the the fifth digit at the interphalangeal joint
What is the proximal attachment of the extensor carpi ulnaris?
-lateral epicondyle of the humerus
What is the distal attachment of the extensor carpi ulnaris?
-dorsal base of the fifth metacarpal
What innervates the extensor carpi ulnaris?
-posterior interosseous nerve
What is the blood supply of the extensor carpi ulnaris?
- branches of the radial artery
- branches of the interosseous artery
What are the actions of the extensor carpi ulnaris?
-extension and adduction of the hand at the wrist
What is the proximal attachment of the pronator teres?
- coronoid process of ulna (ulnar head)
- medial epicondyle and supracondylar ridge of humerus (humeral head)
What is the distal attachment of the pronator teres?
-lateral middle third off the radius
What innervates the pronator teres?
-median nerve
What are the actions of the pronator teres?
- pronates the forearm
- flexes the elbow
What is the proximal attachment of the pronator quadratus?
-distal third of ulna
What is the distal insertion of the pronator quadratus?
-distal third of the radius
What innervates the pronator quadratus?
-anterior interosseous branch of median nerve
What are the actions of the pronator quadratus?
- pronation of the forearm
- assists interosseous in holding radius and ulna together
What is the proximal attachment of the supinator?
- lateral epicondyle of humerus
- radial collateral and annular ligaments
- ulnar crest
What is the distal attachment of the supinator?
-proximal third of radius
What innervates the supinator?
-deep branch of radial nerve
What is the proximal attachment of the abductor pollicis longus?
-posterior proximal ulna, radius, and interosseous membrane
What is the distal attachment of the abductor pollicis longus?
-base of first metacarpal
What innervates the abductor pollicis longus?
-posterior interosseous nerve
What is the blood supply of the abductor pollicis longus?
-posterior interosseous artery
What are the actions of the abductor pollicis longus?
- abduction of the thumb
- extension of the thumb at carpometacapal joint
What is the proximal attachment of the extensor pollicis brevis?
- posterior surface of distal third of radius
- interosseous membrane
What is the distal attachment of the extensor pollicis brevis?
-dorsum of the proximal phalanx of thumb
What innervates the extensor pollicis brevis?
-posterior interosseous nerve
What is the blood supply the extensor pollicis brevis?
-posterior interosseous artery
What are the actions of the extensor pollicis brevis?
- extension of proximal phalanx of the thumb at metacarpophalangeal joint
- extension of thumb at carpometacarpal joint
What is the proximal attachment of the extensor pollicis longus?
- posterior middle third of ulna
- interosseous membrane
What is the distal attachment of the extensor pollicis longus?
-dorsal base of distal phalanx of thumb
What innervates the extensor pollicis longus?
-posterior interosseous nerve
What is the blood supply of the extensor pollicis longus?
- posterior interosseous artery
- perforating branch of anterior interosseous artery
What are the actions of the extensor pollicis longus?
- extension of distal phalanx of the thumb at interphalangeal joint
- extension of wrist at metacarpophalangeal and carpometacarpal joints