Intrinsic Muscles of the Hand

Question 0

pneumonic for the interossei for the hand

Answer 0

start from lateral side of index finger:
Dogs 
Poop 
Dogs 
Don't 
Poop
Dogs 
Poop

DAB –> Dorsal ABducts
PAD–> Palmar ADducts

D stands for Dorsal Interossei Muscles
P stands for Palmar Interossei Muscles

Question 1

What are the Thenar Muscles?

Answer 1

1) Oppnens Pollicis
2) Abductor Pollicis Brevis
3) Flexor Pollicis Brevis : Superficial Head and Deep Head
4) Adductor Pollicis: Oblique Head and Transverse Head

Question 2

Origin of Opponens Pollicis

Answer 2

1) Flexor Retinaculum

2) Tubercles of Scaphoid and Trapezium

Question 3

Insertion for Oppenens Pollicis

Answer 3

Lateral Side of 1st Metacarpal

Question 4

Innervation of Opponens Pollicis

Answer 4

Recurrent Branch of Medial Nerve (C8, T1)

Question 5

Action of Opponens Pollicis

Answer 5

To oppose the thumb, it draws the 1st metacarpal medially to center of the palm and rotates it medially

Question 6

Origin of Abductor Pollicis Brevis

Answer 6

1) Flexor Retinaculum

2) Tubercles of the Scaphoid and Trapezium

Question 7

Insertion of Abductor Pollicis Brevis

Answer 7

Lateral Side of Base of Proximal Phalanx of Thumb

Question 8

Innervation of Abductor Pollicis Brevis

Answer 8

Recurrent Branch of Median Nerve (C8, T1)

Question 9

Action of Abductor Pollicis Brevis

Answer 9

Abducts the thumb; and helps oppose it

Question 10

Origin of Flexor Pollicis Brevis (Superficial Head and Deep Head)

Answer 10

1) Flexor Retinaculum

2) Tubercles of Scaphoid and Trapezium

Question 11

Insertion of Flexor Pollicis Brevis

Answer 11

Lateral Side of Base of Proximal Phalanx of Thumb

Question 12

Innervation of Flexor Pollicis Brevis

Answer 12

Superficial Head: Recurrent Branch of Median Nerve (C8,T1)

Deep Head: Deep Branch of Ulnar Nerve (C8,T1)

Question 13

Action of Flexor Pollicis Brevis

Answer 13

Flexes the Thumb

Question 14

Origin of Adductor Pollicis (Oblique Head and Transverse Head)

Answer 14

1) Oblique Head: a) Bases of 2nd and 3rd Metacarpals
b) Capitate
c) Adjacent Metacarpals

2) Transverse Head: Anterior Surface of Shaft of Third Metacarpal

Question 15

Insertion of Adductor Pollicis

Answer 15

Medial Side of Base of Proximal Phalanx of Thumb

Question 16

Innervation of Adductor Pollicis

Answer 16

Deep Branch of Ulnar Nerve (C8,T1)

Question 17

Action of Adductor Pollicis

Answer 17

Adducts thumb towards lateral border of palm

Question 18

What are the Hypothenar Muscles?

Answer 18

1) Abductor Digiti Minimi
2) Flexor Digiti Minimi Brevis
3) Opponens Digiti Minimi

Question 19

Origin of Abductor Digiti Minimi

Answer 19

Pisiform

Question 20

Insertion of Abductor Digiti Minimi

Answer 20

Medial Side of Base of Proximal Phalanx of 5th Finger

Question 21

Innervation of Abductor Digiti Minimi

Answer 21

Deep Branch of Ulnar Nerve (C8,T1)

Question 22

Action of Abductor Digit Minimi

Answer 22

Abducts the 5th finger; assists of its proximal phalanx

Question 23

Origin of Flexor Digiti Minimi Brevis

Answer 23

1) Hook of Hamate

2) Flexor Retinaculum

Question 24

Insertion of Flexor Digiti Minimi Brevis

Answer 24

Medial Side of Base of Proximal Phalanx of 5th Finger

Question 25

Innervation of Flexor Digiti Minimi Brevis

Answer 25

Deep Branch of Ulnar Neve (C8, T1)

Question 26

Action of Flexor Digiti Minimi Brevis

Answer 26

Flexes the Proximal Phalanx of 5th Finger

Question 27

Origin of Opponens Digiti Minimi

Answer 27

1) Hook of Hamate | 2) Flexor Retinaculum

Question 28

Insertion of Opponens Digiti Minimi

Answer 28

Medial Border of 5th Metacarpal

Question 29

Innervation of Opponens Digiti Minimi

Answer 29

Deep Branch of Ulnar Nerve (C8,T1)

Question 30

Action of Opponens Digiti Minimi

Answer 30

Draws 5th Metacarpal anterior and rotates it, bringing 5th finger into opposition with the thumb

Question 31

What are the short muscles of the hand?

Answer 31

``` Lumbricals (1&2, 3&4) Dorsal Interossei (1-4) Palmar Interossei (1-3) ```

Question 32

Origin of Lumbricals 1&2

Answer 32

Lateral two tendons of Flexor Digitorum Profundus (as unipennate muscles)

Question 33

Insertion of Lumbricals 1&2

Answer 33

Lateral Side of Extensor Expansions 2nd-5th fingers

Question 34

Innervation of Lumbricals 1&2

Answer 34

Median Nerve (C8, T1)

Question 35

Action of Lumbricals 1&2

Answer 35

Flex Metacarpophalangeal Joints; extend interphalangeal joints of 2nd-5th fingers

Question 36

Origin of Lumbricals 3&4

Answer 36

Medial Three Tendons of Flexor Digitorum Profundus (as bipennate muscles)

Question 37

Insertion of Lumbricals 3&4

Answer 37

Lateral Sides of Extensor Expansions of 2nd-5th Fingers

Question 38

Innervation of Lumbrcials 3&4

Answer 38

Median Nerve (C8 and T1)

Question 39

Action of Lumbricals 3&4

Answer 39

Flex Metacarpophalangeal Joints; extend interphalangeal joints of 2nd-5th fingers

Question 40

Origin of Dorsal Interossei 1-4

Answer 40

Adjacent sides of two metacarpals (as bi-pennate muscles)

Question 41

Insertion of Dorsal Interossei 1-4

Answer 41

Bases of Proximal phalanges; extensor expansions of 2nd-4th fingers

Question 42

Innervation of Dorsal Interossei 1-4

Answer 42

Deep Branch of Ulnar Nerve (C8-T1)

Question 43

Action of Dorsal Interossei 1-4

Answer 43

Abduct 2nd-4th Fingers from Axial Line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 44

Origin of Palmar Interossei 1-3

Answer 44

Palmar Surface of 2nd, 4th, and 5th metacarpals (as unipennate muscles)

Question 45

Insertion of Palmar Interossei 1-3

Answer 45

Bases of Proximal Phalanges; Extensor Expansions of 2nd, 4th and 5th fingers

Question 46

Innervation of Palmar Interossei 1-3

Answer 46

Deep Branch of Ulnar Nerve (C8,T1)

Question 47

Action of Palmar Interossei 1-3

Answer 47

Adduct 2nd, 4th, and 5th Fingers towards axial lines; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints