Hand and Wrist Muscles Flashcards
What is the proximal attachment of the extensor indicis?
-posterior distal thrid of ulna
What is the distal attachment of the extensor indicis?
-extensor expansion of second digit
What innervates the extensor indicis?
-posterior interosseous nerve
What is the blood supply of the extensor indicis?
-branches of the interosseous artery
What are the actions of the extensor indicis?
-extension of second digit
What is the proximal attachment of the opponens pollicis?
- flexor retinaculum
- tubercles of scaphoid and trapezium
What is the distal attachment of the opponens pollicis?
-lateral first metacarpal
What innervates the opponens pollicis?
-recurrent branch of median nerve
What is the blood supply of the opponens pollicis?
-radial artery
What are the actions of the opponens pollicis?
- opposition of thumb
- medial rotation of thumb
What is the proximal attachment of the abductor pollicis brevis?
- flexor retinaculum
- tubercles of scaphoid and trapezium
What is the distal attachment of the abductor pollicis brevis?
-lateral base of proximal first phalanx
What innervates the abductor pollicis brevis?
-recurrent branch of median nerve
What is the blood supply of the abductor pollicis brevis?
-radial artery
What are the actions of the abductor pollicis brevis?
- abduction of thumb
- aids in opposition of thumb
What is the proximal attachment of the flexor pollicis brevis?
- flexor retinaculum
- tubercles of scaphoid and trapezium
What is the distal attachment of the flexor pollicis brevis?
-lateral base of proximal first phalanx
What innervates the flexor pollicis brevis?
- recurrent branch of median nerve
- deep branch of ulnar nerve
What is the blood supply of the flexor pollicis brevis?
-radial artery
What are the actions of the flexor pollicis brevis?
-flexion of thumb
What is the proximal attachment of the adductor pollicis?
- base of second and third metacarpals (oblique head)
- capitate and adjacent carpals (transverse head
What is the distal attachment of the adductor pollicis?
-medial base of proximal phalanx
What innervates the adductor pollicis?
-deep branch of ulnar nerve
What is the blood supply of the adductor pollicis?
-radial artery
What are the actions of the adductor pollicis?
-adducts thumb
What is the proximal attachment of the abductor digiti minimi?
-pisiform
What is the distal attachment of the abductor digiti minimi?
-medial base of proximal fifth phalanx
What is the innervation of the abductor digiti minimi?
-deep branch of ulnar nerve
What is the blood supply of the abductor digiti minimi?
-ulnar artery
What are the actions of the abductor digiti minimi?
- abducts fifth digit
- assists in flexion of 5 proximal phalanx
What is the proximal attachment of the flexor digiti minimi (brevis)?
- hook of hamate
- flexor retinaculum
What is the distal attachment of the flexor digiti minimi?
-medial base of proximal fifth phalanx
What innervates the flexor digiti minimi?
-deep branch of ulnar nerve
What is the blood supply of the flexor digiti minimi?
-ulnar artery
What are the actions of the flexor digiti minimi?
-flexion of the fifth metacarpal
What is the proximal attachment of the opponens digiti minimi?
- hook of hamate
- flexor retinaculum
What is the distal attachment of the opponens digiti minimi?
-medial border of fifth metacarpal
What innervates the opponens digiti minimi?
-deep branch of ulnar nerve
What is the blood supply of the opponens digiti minimi?
-ulnar artery
What are the actions of the opponens digiti minimi?
-brings fifth metacarpal into opposition with the thumb
What are the proximal attachments of the dorsal interossei?
-adjacent sides of metacarpals (first and second; second and third; third and fourth; fourth and fifth)
What is the distal attachment of the dorsal interossei?
-extensor expansions of digits 2-4 (medial second proximal phalanx; medial and lateral thrid proximal phalanx; lateral fourth proximal phalanx)
What innervates the dorsal interossei?
-ulnar nerve
What are the actions of the dorsal interossei?
-abduction of digits 2-4
What are the proximal attachments of the palmar interossei?
-sides of first, second, fourth, and fifth metacarpals (medial; medial; lateral; lateral)
What are the distal attachments of the palmar interossei?
-sides of proximal first, second, fourth, and fifth proximal phalanges (lateral; lateral; medial; medial)
What innervates the palmar interossei?
-ulnar nerve (all)
What is the action of the palmar interossei?
-adduction of first, second, fourth and fifth digits
What are the proximal attachments of the lumbricals?
-lateral sides of the flexor digitorum profundus tendons (digits 2-5)
What are the distal attachments of the lumbricals?
-lateral extensor expansion (digits 2-5)
What innervates the lumbircals?
- median nerve (lateral two lumbircals)
- ulnar nerve (medial two lumbircals)
What is the blood supply of the lumricals?
-branches of the radial and ulnar arteries
What is the action of the lumbricals?
- flexion of MCP 2-5
- extension of IP joints 2-5