Hand Muscles, Movement And Function

Question 1

Name the muscles of the thenar eminence

Answer 1

Flexor pollicis brevis
Abductor pollicis brevis
Opponents Pollicis
Adductor pollicis

Question 2

Which is the most medial of the thenar muscles?

Answer 2

Flexor Pollicis Brevis

Question 3

What are the origins of Flexor Pollicis Brevis?

Answer 3

Flexor retinaculum
Tubercle of trapezium

Question 4

Where does Flexor Pollicis Brevis insert?

Answer 4

Radial side of the base of the proximal phalanx of thumb

Question 5

What is the nerve supply of Flexor Pollicis Brevis?

Answer 5

Median T1

Question 6

What are the actions of Flexor Pollicis Brevis?

Answer 6

Flexion MCP, CMC, medial rotation of thumb

Question 7

Which is the most lateral and superficial of the thenar muscles?

Answer 7

Abductor Pollicis Brevis

Question 8

What are the origins of Abductor Pollicis Brevis?

Answer 8

Flexor retinaculum
Tubercles of scaphoid and trapezium

Question 9

Where are the insertions of Abductor Pollicis Brevis?

Answer 9

Radial side of the base of the proximal phalanx of the thumb
Extensor hood of the thumb

Question 10

What is the nerve supply of Abductor Pollicis brevis?

Answer 10

Median T1

Question 11

What action does Abductor Pollicis brevis produce?

Answer 11

Abduction of the CMC/MCP joints of the thumb

Question 12

Where does Opponens Pollicis originate?

Answer 12

Flexor retinaculum
Tubercle of trapezium

Question 13

Where does Opponens Pollicis insert?

Answer 13

Whole length anterior-lateral surface of first metacarpal

Question 14

What is the nerve supply of Opponens Pollicis?

Answer 14

Median T1

Question 15

What action does Opponens Pollicis produce?

Answer 15

Opposition

Question 16

Which thenar muscle is found in the web space of the thumb?

Answer 16

Adductor Pollicis

Question 17

Where does adductor Pollicis originate?

Answer 17

Capitate
Base of metacarpal 2 and 3
Anterior surface shaft of the third metacarpal

Question 18

Where does adductor Pollicis insert?

Answer 18

Medial side base proximal phalanx of the thumb
Extensor hood of the thumb

Question 19

What is the nerve supply of adductor Pollicis?

Answer 19

Ulnar nerve C8, T1

Question 20

What action does adductor Pollicis produce?

Answer 20

Adduction of the thumb

Question 21

Which muscles are in the hypothenar eminence?

Answer 21

Abductor Digiti Minimi
Flexor Digiti Minimi
Opponens Digiti Minimi
Palmaris brevis

Question 22

Which is the most superficial hypothenar muscle?

Answer 22

Abductor Digit Minimi

Question 23

Where does Adductor Digiti Minimi originate?

Answer 23

Pisiform
Pisohammate ligament
FCU tendon

Question 24

Where does Abductor Digiti Minimi insert?

Answer 24

Ulnar side proximal phalanx of little finger
Extensor hood

Question 25

What actions are produces by Abductor Digiti Minimi?

Answer 25

Abduction 5th MCP Flexion 5th MCP

Question 26

What is the nerve supply of Abductor Digit Minimi?

Answer 26

Ulnar T1

Question 27

Where does Flexor Digiti Minimi originate?

Answer 27

Hook of Hamate Flexor retinaculum

Question 28

Where does Flexor Digiti Minimi insert?

Answer 28

Ulnar side base proximal phalanx little finger

Question 29

What action does Flexor Digiti Minimi produce?

Answer 29

Flexes 5th MCP

Question 30

What is the nerve supply of Flexor Digiti Minimi?

Answer 30

Ulnar nerve T1

Question 31

Where does Opponens Digiti Minimi originate?

Answer 31

Hook of Hamate Flexor retinaculum

Question 32

Where does Opponens Digiti Minimi insert?

Answer 32

Antero-medial aspect of shaft of 5th MC

Question 33

What is the action of Opponens Digiti Minimi?

Answer 33

Opposition 5th digit

Question 34

What is the nerve supply of Opponens Digiti Minimi?

Answer 34

Ulnar T1

Question 35

Where does Palmaris Brevis originate?

Answer 35

Flexor retinaculum Palmar aponeurosis

Question 36

Where does Palmaris brevis insert?

Answer 36

Skin of palm into dermis

Question 37

What action is produced by palmaris Brevis?

Answer 37

Steadies and corrugates skin of palm to help with grip

Question 38

What is the nerve supply of Palmaris Brevis?

Answer 38

Ulnar nerve C8,T1

Question 39

What action do dorsal interossei muscles produce?

Answer 39

Abduction of fingers 2,3,4

Question 40

What is the nerve supply for all the dorsal interossei muscles?

Answer 40

Ulnar nerve C8 and T1

Question 41

What action do palmar interossei produce?

Answer 41

Adduction of digits 1,2,4,5

Question 42

What is the nerve supply of all the palmar interossei muscles?

Answer 42

Ulna nerve C8 and T1

Question 43

What do the interossei muscles contribute to via the extensor hood?

Answer 43

Extension of the IP joints Flexion of the MCP joints Prevention of hyper extension of the MCP Important in pretension activities

Question 44

What do lumbricals attach into?

Answer 44

Extensor hood

Question 45

What actions are produced by the lumbricals?

Answer 45

Strong extensors of the IP joints Weak flexors of the MCP joints Important in pretension activities

Question 46

What are the 4 Palamar arches?

Answer 46

Proximal transverse arch Distal transverse arch Longitudinal arch Oblique arch