Week Two Muscles

Question 1

Pronator Teres (Origin, insertion, action, innervation)

Answer 1

(O) - Humeral Head: Common Flexor Tendon
Ulnar Head: Coronoid Process of the Ulna
(I) - The middle of the lateral aspect of the Radius
(A) - Pronation of the forearm, Humeral Head: Flexion of the elbow
(N) - Median

Question 2

Flexor Carpi Radialis O, I, N, A

Answer 2

(O) - Common Flexor Tendon
(I) - base of the second metacarpal
(A) - Flexion and radial deviation of the wrist
(N) - Median

Question 3

Palmaris Longus (O, I, N, A)

Answer 3

(O) Common Flexor Tendon
(I) Palmar aponeurosis 
(N) Median
(A) Flexion of the wrist
Superficial layer of the anterior forearm

Question 4

Flexor Carpi Ulnaris (OINA)

Answer 4

(O) Common Flexor Tendon (Humeral Head)
Ulnar Head - Proximal posterior of the Ulna
(I) Pisiform
(A) Wrist flexion and ulnar deviation

Question 5

Flexor Digitorum Superficialis

Answer 5

(O) Common flexor tendon, coronoid fossa of the ulna, proximal 1/2 of the anterior radius
(I) Both sides of the middle phalanx of the four fingers
(N) Median
(A) PIP, MP, and wrist flexion
Intermediate layer of the forearm

Question 6

Flexor Digitorum Profundus

Answer 6

(O) Anterior and Medial proximal surfaces of the ulna and the interosseous membrane
(I) Base of the distal phalanx of the four fingers
(A) Flexion of the DIP, PIP, MP, and wrist
(N) Median fibers (ulnar n.) lateral fibers (median n.)

Question 7

Flexor Pollicis Longus

Answer 7

(O) Middle third of the anterior radius
(I) Distal phalanx of the thumb
(A) Flexion of IP, MP, CMC, and wrist joints
N. Median

Question 8

Pronator Quadratus

Answer 8

(O) Distal 1/4 of the anterior ulna
(I) Distal 1/4 of the anterolateral radius
(N) Median
(A) pronation of the forearm

Question 9

Abductor pollicis brevis

Answer 9

Origin - scaphoid, trapezium, flexor retinaculum
Insertion- base of the radial side of the first phalanx
Action- abduction of the thumb
Innervation- Recurrent branch median

Question 10

Palmar interossei

Answer 10

Origin- palmar surface of the 2nd, +4th and fifth metacarpals
Insertion- extensor expansions and base of the proximal phalanges
Actions- Adduction of fingers 2, 4, and 5 Metacarpal phalangeal joints flexion, extension of the distal and proximal phalangeal joints
Ennervation- Ulnar

Question 11

Abductor digiti minimi

Answer 11

Origin- pisiform
Insertion- Ulnar side of the base of the fifth proximal phalanx
Action- abduction of the little finger
Innervation- ulnar nerve

Question 12

Palmeris brevis

Answer 12

Origin- flexor retinaculum, and palmar aponeurosis
Insertion- skin of the medial palm
Action- wrinkles the medial skin of the palm
Innervation- ulnar nerve

Question 13

Flexor pollicis brevis

Answer 13

Origin- flexor retinaculam, trapezium and scaphoid
Insertion- radial side of the base of the proximal first phalanx
Action- flexion of the metacarpal phalangeal and carpal metacarpal joints
Innervation- median nerve recurrent branch

Question 14

Dorsal interossei

Answer 14

Origin- adjoining surfaces of the metacarpals
Insertion- extensor expansions, bases of the proximal phalanx of fingers 2,3, and 4
Actions- flexion of the metacarpal joints, abduction of fingers 2,3, and 4, extension of the distal and proximal interphalangeel joints
Innervation- ulnar

Question 15

Flexor digiti minimi brevis

Answer 15

Origin- hook of the hamate and flexor retinaculum
Insertion- ulnar side of the base of the proximal 5th phalanx
Action- flexion 5th metacarpal phalangeal joint
Innervation- velar nerve

Question 16

Lumbricales

Answer 16

Origin- radial side of the tendon of the flexor digiti profundus
Insertion- extensor expansions on the radial side
Actions- flexion of the mp joints of fingers 1-4 and extension of proximal and distal inter phalange al joints
Innervation- clar nerve for the medial two lumbricales and median nerve for the lateral two

Question 17

Opponens pollicis

Answer 17

Origin- scaphoid, trapezium and flexor retinaculam
Insertion- radial side shaft of the 1st metatarsal
Action- opposition of the thumb
Innervation- median nerve, recurrent branch

Question 18

Adductor policis

Answer 18

Origin- The oblique head originates at the capitate and the base of the second and third metacarpals. The transverse origin is at the shaft of the third metacarpal
Insertion- ulnar side of the base of the proximal phalanx
Innervation- Ulnar

Question 19

Opponens Digiti minimi

Answer 19

Origin- hook of the hamate and flexor retinaculum
Insertion- ulnar side shaft of the fifth metacarpal
Action-opposition of the little finger
Innervation-ulnar