MSK Session 4- Anterior And Posterior Forearm Flashcards
Name the four superficial anterior muscles of the forearm. (Lateral to medial)
- pronator teres
- flexor carpi radialis
- palmaris longus
- flexor carpi ulnaris
What is the action and innervation of pronator teres?
Action- pronates and flexes the forearm
Innervation- median nerve
What is action and innervation of flexor carpi radialis?
Action- flexion and abduction of the wrist
Innervation- median nerve
What is the action and innervation of palmaris longus?
Action- flexion of the wrist
Innervation- median nerve
What is the action and innervation of flexor carpi ulnaris?
Action- flexion and Adduction of the wrist
Innervation- ulnar nerve
What is the intermediate muscle of the anterior forearm?
What is its action and innervation?
Flexor digitorum superficialis
Action- flexion of the medial 4 digits at the proximal interphalangeal joint.
Innervation- median nerve
What are the 3 deep muscles of the anterior forearm?
Flexor digitorum profundus
Pronator quadratus
Flexor pollicis longus
What is the action and innervation of flexor digitorum profundus?
Action- flexion of the distal interphalangeal joints of the medial 4 digits.
Innervation- medial 1/2- ulnar nerve, rest- anterior interosseous nerve
What is the action and innervation of pronator quadratus?
Action- pronation
Innervation- anterior interosseous nerve
What is the action and innervation of flexor pollicis longus?
Action- flexion of the thumb
Innervation- anterior interosseous nerve
How many muscle layers are there in the posterior forearm?
3
What are the 6 superficial posterior forearm muscles? (Lateral to medial)
Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris
What is the action and innervation of extensor carpi radialis longus?
Action- extension and abduction of the wrist
Innervation- radial nerve
What is the action and innervation of extensor carpi radialis brevis?
Action- extension and abduction of the wrist
Innervation- deep branch of radial nerve
What is the action and innervation of the extensor digitorum?
Action- extension of the 4 medial digits at the metacarpophalangeal joints.
Innervation- deep branch of radial nerve
What is the action and innervation of extensor digit minimi?
Action- extension of the 5th digit at the metacarpophalangeal joint
Innervation- deep branch of radial
What is the action and innervation of extensor carpi ulnaris?
Action- extension and adduction of the wrist.
Innervation- deep radial
What are the two deep muscles of the posterior forearm? What are their actions and innervations?
Supinator -action - supinates the forearm -innervation- deep radial nerve Extensor indicis -action - extension of the index finger -innervation- posterior interosseous nerve
What are the 3 outcropping muscles of the deep layer of the posterior forearm? (Lateral to medial)
- adductor pollicis longus
- extensor pollicis brevis
- extensor pollicis longus
What is the action and innervation of abductor pollicis longus?
Action- abducts and extends thumb at carpometacarpal joint
Innervation- posterior interosseous nerve
What is the action and innervation of extensor pollicis brevis?
Action- extends distal phalanx of thumb at interphalangeal joint
Innervation- posterior interosseous nerve
What is the action and innervation of extensor pollicis longus?
Action- extends the proximal phalanx of the thumb at the metacarpophalangeal joint.
Innervation- posterior interosseous nerve
What is the floor of the anatomical snuffbox? (2)
Scaphoid and trapezium
What is the medial border of the anatomical snuffbox?
Extensor pollicis longus
What is the lateral border of the anatomical snuffbox? (2)
Abductor pollicis longus and extensor pollicis brevis
What runs through the anatomical snuffbox? (2)
Radial artery and nerve
How many layers of muscles are there in the anterior forearm?
3
