Intrinsic mm of hand

Question 1

Opponens Pollicis

Answer 1

Thenar Muscle
O: Flexor retinaculum and tubercles of scaphoid process and Trapezium
I: Lateral side of first MC
INNE: Recurrent branch of Median n. (C8, T1)
Action: To oppose thumb, it draws 1st MC medially to center of palm and rotates it medially

Question 2

Abductor Pollicis Brevis

Answer 2

Thenar m
O: Flexor retinaculum and tubercles of scaphoid process and Trapezium
I: Lateral side of base of proximal phalanx of thumb
INNE: Recurrent branch of Median n. (C8, T1)
Abducts thumb; helps oppose

Question 3

Adductor Pollicis

Answer 3

Thenar m
Thenar Muscle
O: Oblique head: base of second and third MC, capitate, and adjacent carpals
Transverse head: anterior surface of shaft of 3rd MC
I: Medial side of base of proximal phalanx of thumb
INNE: Deep branch of ulnar n. (C8, T1)
Action; ADD thumb

Question 4

Adductor Pollicis

Answer 4

Thenar muscle
O: Olblique Head = Bases of 2nd and 3rd MC, capitate, and adjacent carpals
Transverse Head = Anterior surface of shaft of 3rd MC
I: Medial side of base of proximal phalanx of thumb
INNE; Deep branch of ulnar n. (C8, T1)
Action; ADD thumb and lateral border of palm

Question 5

Abductor Digiti Minimi

Answer 5

thenar m
O: pisiform
I:Medial side of base of proximal phalanx
INNE: deep branch of ulnar nerve (C8, T1)
Actions; Abducts 5th digit; assists in FLX of its proximal phalanx

Question 6

Flexor Digiti Minimi Brevis

Answer 6

hypothenar m.
O: Hook of Hamate and Flexor retinaculum
I: Medial side of base of proximal phalanx of 5th digit.
INNE: Deep branch of ulnar n. (C8, T1)
Action: FLX proximal phalanx

Question 7

Opponens Digiti

Answer 7

hypothenar m.
O: Hook of Hamate and Flexor retinaculum
I: Medial border of 5th MC
INNE: Deep Branch of ulnar n. (C8, T1)
Action: draws 5th finger anteriorly and rotates it, to do opposition with the thumb

Question 8

Lumbricals 1st and 2nd

Answer 8

Short Muscle
O: lateral two tendons of FDP (unipennate)
I: lateral sides of extensor expansions of 2nd-5th digits
INNE: Median n. (C8, T1)
Action: FLX MCp joints, and EXT IP joints of 2-5 digits

Question 9

Lumbricals 3rd and 4th

Answer 9

Short m.
O: Medial three tendons of FDP
I: lateral sides of extensor expansions of I: 2nd-5th digits
INNE: Deep branch of Ulnar n (C8, T1)
Action: FLX MCp joints, and EXT IP joints of 2-5 digits