[Muscles] Thenar muscles

Question 1

Abductor Pollicis Brevis

Answer 1

O: Flexor retinaculum, tubercle of scaphoid and trapezium bones
Ins: Lateral side of base of proximal phalanx of thumb and extensor hood of the thumb
Inn: Median Nerve
Bs: Superficial palmar branch of radial artery
Action: abducts thumb at MCP jt

Question 2

Flexor Pollicis Brevis

Answer 2

O: Superficial head: flexor retinaculum, trapezium
Deep head: floor of carpal canal
Ins: Proximal phalanx of thumb
Inn: Median nerve
Bs: Superficial palmar branch of radial artery
Action: Flexes thumb at MCP jt

Question 3

Opponens Pollicis

Answer 3

O: Flexor retinaculum, trapezium
Ins: lateral side of first metacarpal bone
Inn: Median nerve
Bs: superficial palmar branch of radial artery
Action: Opposes thumb