Posterior Compartment of Forearm Muscles Flashcards
what are the 6 superficial muscles of the posterior compartment of the forearm
- brachioradialis
- extensor carpi radialis longus
- extensor carpi radialis brevis
- extensor digitorum
- extensor carpi ulnaris
- extensor digiti minimi
what are the 5 deep muscles of the posterior compartment of the forearm
- supinator
- abductor pollicis longus
- extensor pollicis brevis
- extensor pollicis longus
- extensor indicis
what are the attachments of the brachioradialis
proximal: lateral 2/3 of supracondylar ridge of humerus
distal: distal end of radius
what is the torque of the brachioradialis
flexor torque on the forearm (no wrist)
what is the innervation and blood supply of the brachioradialis
radial nerve (C5, C6, C7)
radial recurrent artery
what are the attachments of the extensor carpi radialis longus
proximal: lateral supracondylar ridge of humerus
distal: base of 2nd metacarpal
what is the torque of the extensor carpi radialis longus
extensor & abductor on hand at wrist
maintains neutral wrist when making a fist
what are the innervations and blood supply of extensor carpi radialis longus
radial nerve (C6 & C7)
radial recurrent artery
what are the attachments of the extensor carpi radialis brevis
proximal: lateral epicondyle of humerus
distal: base of 3rd metacarpal
what is the torque of the extensor carpi radialis brevis
extensor & abductor on hand at wrist
what is the innervation and blood supply of the extensor carpi radialis brevis
deep branch radial nerve (C7 & C8)
radial artery
what are the attachments of the extensor digitorum
proximal: lateral epicondyle of humerus
distal: extensor expansions digits 2,3,4
what is the torque of the extensor digitorum
extensor digits 2,3,4 on MP & IP joints
extensor on manus at wrist
what is the innervation and blood supply of the extensor digitorum
posterior interosseus nerve (C7 & C8)
interosseous recurrent & posterior interosseous artery
what are the attachments of the extensor carpi ulnaris
proximal: lateral epicondyle of humerus & posterior boarder of ulna
distal: base of 5th metacarpal
what is the torque of the extensor carpi ulnaris
extensor & adductor on hand at wrist
what is the innervation and blood supply of the extensor carpi ulnaris
posterior interosseus nerve (C7 & C8)
ulnar artery
what are the attachments of the extensor digiti minimi
proximal: lateral epicondyle of humerus
distal: extensor explansion of 5th digit
what is the torque of the extensor digiti minimi
extensor 5th digit at MP joint and IP joints
what is the innervation and blood supply to the extensor digiti minimi
posterior interosseus nerve (C7 & C8)
interosseous recurrent artery
what are the attachments of the supinator
proximal: lateral epicondyle of humerus, radial collateral & annular ligaments, supinator fossa & proximal crest of ulna
distal: lateral, posterior & anterior surfaces of proximal 1/3 of radius
what is the torque of the supinator
supinates the forearm
what are the innervations and blood supply to the supinator
deep branch of radial nerve (C7 & C8)
recurrent interosseous artery
what are the attachments of the abductor pollicis longus
proximal: posterior surface of ulna, interosseous membrane & radius
distal: base of 1st metacarpal
what is the torque of the abductor pollicis longus
abductor & extensor thumb at carpometacarpal (CM) joint
what innervates and provides blood supply to the abductor pollicis longus
posterior interosseous nerve (C7 & C8)
posterior interosseous artery
what are the attachments of the extensor pollicis brevis
proximal: posterior surfaces of radius & interosseous membrane
distal: base of proximal phalanx of thumb
what is the torque of the extensor pollicis brevis
extensor on proximal phalanx of thumb at CM & MCP joints
extensor and abductor at hand
what is the innervation and blood supply to the extensor pollicis brevis
posterior interosseous nerve (C7 & C8)
posterior interosseous artery
what are the attachments of the extensor pollicis longus
proximal: posterior surface of middle 1/3 of ulnar & interosseous membrane
distal: base of distal phalanx of thumb
what is the torque of the extensor pollicis longus
extensor on distal phalanx thumb at CM, MCP, & IP joints
what innervates and supplies blood to the extensor pollicis longus
posterior interosseous nerve (C7 & C8)
posterior interosseous artery
what makes up the anatomical snuff box
extensor pollicis longus
extensor pollicis brevis
what are the attachments of the extensor indicis
proximal: posterior surface of ulna & interosseous membrane
distal: extensor expansion of 2nd digit
what is the torque of the extensor indicis
extensor on the 2nd digit
what is the innervation and blood supply to the extensor indicis
posterior interosseous nerve (C7 & C8)
posterior interosseous artery
