Thenar Muscles Flashcards
What is the distal attachment of opponens pollicis?
lateral side of 1st metacarpal
What is the proximal attachment of opponens pollicis?
flexor retinaculum and tubercels of scaphoid and trapezium
What innervates opponens pollicis?
recurrent branch of median nerve (C8, T1)
What is the main action of opponens pollicis?
to oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially
What is the proximal attachment of abductor pollicis brevis?
flexor retinaculum and tubercles of scaphoid and trapezium
What is the distal attachment of abductor pollicis brevis?
lateral side of base of proximal phalanx of thumb
What innervates abductor pollicis brevis?
recurrent branch of median nerve (C8, T1)
What is the main action of abductor pollicis brevis?
abducts thumb; helps oppose it
What is the proximal attachment of flexor pollicis brevis (superficial head/deep head)?
flexor retinaculum and tubercles of scaphoid and trapezium
What is the distal attachment of flexor pollicis brevis?
lateral side of base of proximal phalanx of thumb
What innervates flexor pollicis brevis?
recurrent branch of median nerve (C8, T1)
What is the main action of flexor pollicis brevis?
flexes thumb
What is the proximal attachment of adductor pollicis?
oblique head: bases of 2nd and 3rd metacarpals, capitate, adjacent carpals
transverse head: anterior surface of shaft of 3rd metacarpal
What is the distal attachment of adductor pollicis?
medial side of base of proximal phalanx of thumb
What innervates the adductor pollicis?
deep branch of ulnar nerve (C8, T1)
