Hand (Thenar) Flashcards by Winna Wijaya | Brainscape

Q

Abductor Pollicis Brevis

A

Origin: Flexor retinaculum, scaphoid, trapezium

Insertion: Proximal phalanx of thumb

Action: Thumb abduction @ MCP

Innervation: Median nerve - recurrent branch (C8, T1)

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Q

Flexor Pollicis Brevis

A

Origin: Flexor retinaculum, trapezium

Insertion: Proximal phalanx of thumb

Action: Thumb flexion @ MCP

Innervation: Median nerve - recurrent branch (C8, T1)

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Q

Opponens Pollicis

A

Origin: Flexor retinaculum, trapezium

Insertion: 1st metacarpal

Action: Oppose 1st MC (draws 1st metacarpal forward and rotates it medially)

Innervation: Median nerve - recurrent branch (C8, T1)

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