Hand Muscles

Question 1

Thenar muscle group

Answer 1

Abductor policis brevis
Proximal: flexor retinaculum, scaphoid and trapezium tubercle
Distal: lateral base of distal phalanx of thumb
Median nerve recurrent branch
Abducts 1st MCPJ

Flexor policis brevis:
Proximal: flexor retinaculum, scaphoid and trapezium tubercle
Distal: lateral base of proximal phalanx of thumb
Median nerve recurrent branch
FLEXES 1st MCPJ

Opponens policis
Proximal: flexor retinaculum, scaphoid and trapezium tubercle
Distal: lateral base of first met
Median nerve recurrent branch
?

Question 2

Hypothenar muscle group

Answer 2

Abductor digiti minimi
Proximal: pisiform
Distal: middle base of proximal phalanx of 5th digit
ulnar nerve deep branch
Abducts 5th MCPJ

FLEXOR DIGITINI MINIMI
proximal: hook of hamate and flexor retinaculum
Distal: middle base of proximal phalanx of 5th digit
Ulnar nerve deep branch
Flex 5th MCPJ

Opponens digiti minimi
Proximal: hook of hamate and flexor retinaculum
Distal: medial border of 5th met
Ulnar nerve deep branch
Opposes 5th MCPJ

Question 3

Central Group

Answer 3

Lumbricals (1st and 2nd ) lateral 2 tendons of FDP
(3 and 4) medial 3 tendons of FDP
DISTAL: lateral extensor expansion of digits 2-5

Median nerve
Flexes mcpj and extends IPJS OF 2-5

Abductor policis
Base of 2nd and 3rd met, capitate
Distal: middle base of proximal phalanx of thumb
Ulnar nerve deep branch
Abducts 1st MCPJ

Dorsal interossi
Proximal: adjacent sides of metacarpals
Distal: base of proximal phalanx &extsnskr hood of digits 2-4
Ulnar nerve deep branch
Abducts MCPJ of digits 2-4

Palmar interossi
Proximal: side of metacarpals
Distal: base of proximal phalanx and extensor hood of digits 2,3,4,5
Ulnar nerve deep branch
Adduct 2,,4,5th MCPJ