Chpt. 7 Wrist and hand Joints

Question 1

In wrist/hand: How many

• bones
• joints and
• muscles are there ?

Answer 1

• 29 bones
• 25 joints
• 30 muscles

Question 2

What kind of bone does the thumb have to increase power in in its flexor tendon?

Answer 2

sesamoid bone

Question 3

There are how many in each?
Carpals:
Metacarpals
Phalanges

Answer 3

• 8 Carpals
• 5 MCs
• 14 phalanges

Question 4

First row of Carpal bones from Radial to Ulnar side (4)

Answer 4

• scaphoid
• -lunare? lunate
• triquetrum
• pisiform

Question 5

Second row of Carpal bones from Radial to Ulnar side (4)

Answer 5

• trapezium
• trapezoid
• capitate
• hamate

Question 6

How many of each?
(FDS) 
(FDP)
(FPL)
Median Nerve

Answer 6

• 4 Flexor digitorum superficialis
• 4 Flexor digitorum profundus
• 1 Flexor Pollicis longus
• 1 Median Nerve

Question 7

What are the 5 bones involved in wrist motion?

Answer 7

• base of 2nd, 3rd, 5th metacarpals
• pisiform
• hamate

Question 8

A condyloid joint allows what two types of movement?

Answer 8

• flexion/extension

- abduction/adduction

Question 9

For wrist joint, what degree for:
Flexion
Extension
Abduction (radial deviation)
Adduction (ulnar deviation)

Answer 9

Flex: 70-90
Ext: 65-85
Abd: 15-25
Add: 25-40

Question 10

Each finger has what 3 joints except for the thumb?

Answer 10

MCP
PIP
DIP

Question 11

MCP is what type of joint?

Answer 11

Condyloid (spins around axel)

Question 12

PIP is what type of joint?

Answer 12

Ginglymus (Hinge joint)

Question 13

DIP is what type of joint?

Answer 13

Ginglymus (Hinge joint)

Question 14

What two joints does the thumb have?

Answer 14

MCP and IP (Interphalangeal) joint

Question 15

what 3 flexors MUSCLES are involved in wrist flexion?

CARPI=WRIST

Answer 15

1. Flexor Carpi radialis
2. Flexor Carpi Ulnaris
3. Palmaris longus

Question 16

what 3 extensors MUSCLES are involved in wrist extension?

Answer 16

1. Extensor carpi radialis longus (HIGHER UP BY ELBOW)
2. Extensor carpi radialis brevis
3. Extensor carpi ulnaris

Question 17

What 3 flexor muscles are involved in finger flexion?

Answer 17

1. Flexor digitorum superficialis
2. Flexor digitorum profundus
3. Flexor pollicis longus (thumb flexor)

Question 18

What 5 extensor muscles are involved in finger extension?

Answer 18

1. Extensor digitorum (extends digits 2,3,4,5)
2. Extensor indicis (extends index finger)
3. Extensor digiti minimi (extends pinky)
4. Extensor pollicis longus (thumb extensor)
5. Extensor pollicis brevis (thumb extensor

Question 19

*What muscle abducts the thumb and wrist?

Answer 19

Abductor pollicis longus (abduct the thumb)

Question 20

*What are the main 4 nerves involved in hand and wrist movement?

Answer 20

Generally:

• Median(palms up)
• Radial (backside)
• Radial (biceps area)
• Muscutaneous (triceps area)

Question 21

All wrist & hand muscles are innervated from the ___, __ , & __ nerves of the brachial plexus

Answer 21

• radial,
• median
• ulnar

Question 22

What is the OINA for FCR (Flexor Carpi Radialis)?

Answer 22

O: medial epicondyle
I: base of 2rd /3rd MC
N: Median nerve
A: Flexion

Question 23

What is the OINA for Palmaris Longus Muscle?

Insertion?

Answer 23

O: Medial epicondyle
*I: Palmar fascia
N: median nerve
A: flexion

Question 24

What is the OINA for FCU (Flexor Carpi Ulnaris Muscle?

Answer 24

O: Medial epicondyle
I: Pisiform, hamate, base of 5th MC
N: Ulnar nerve
A: flexion

Question 25

What is the OINA for (FDS) Flexor Digitorum Superficialis Muscle?

Answer 25

O: medial epicondyle
I: middle phalanges of digits 2-5
N: median nerve
A: flex digits (flexion)

Question 26

*****What is the OINA for Flexor Digitorum Profundus Muscle (FDP)?

Answer 26

O: proximal ¾ ulnar
I: base of distal phalanges
N: median (2,3) ulnar (4,5)
A: (FLEXES EVERYTHING) Flex DIP, and wrist, PIP/MCP

Question 27

***What is the OINA for Flexor Pollicis Longus Muscle (FPL)?

Answer 27

O: Middle radius
I: base of distal phalanx of thumb
N: median nerve
A: flexes thumb

Question 28

What is the OINA for Extensor Carpi Ulnaris Muscle?

Answer 28

O: lateral epicondyle
I: base of 5th MC
N: radial nerve
A: extension of wrist

Question 29

What is the OINA for Extensor Carpi Radialis Brevis Muscle?

insertion?

Answer 29

O: lat. epicondyle
I: base of 3rd MC
N: radial
A: extension of wrist

Question 30

What is the OINA for Extensor Carpi Radialis Longus Muscle?

insertion?

Answer 30

O: lat. epicondyle
I: base of 2nd MC
N: radial
A: extension of wrist

Question 31

What is the OINA for Extensor Digitorum Muscle ?

action?

Answer 31

O: lat. epicondyle
I: base of middle + distal phalanges 2-5
N: radial
A: extension of wrist, extends digits 2-5 (not thumb)

Question 32

What is the OINA for Extensor Indicis Muscle ?

origin???

Answer 32

O: middle third
I: middle + distal phalange (2nd)
N: radial
A: extension of index

Question 33

What is the OINA for Extensor Digiti Minimi Muscle ?

Answer 33

O: lat. Epicondyle
I: base of middle + distal phalange (5th)
N: radial
A: extension of 5th digit (pinky)

Question 34

What is the OINA for Extensor Pollicis Longus Muscle ?
origin?
insertion?

Answer 34

O: middle ulna
I: base of middle + distal phalanx (1st/thumb)
N: radial
A: extension of 1st digit (thumb)

Question 35

What is the OINA for Extensor Pollicis Brevis Muscle ?
origin?
insertion?

Answer 35

O: middle radius
I: base of middle + proximal phalanx (1st/thumb)
N: radial
A: extension of 1st digit (thumb)

Question 36

What is the OINA for Abductor Pollicis Longus Muscle ?

origin? both radius + ulna

Answer 36

O: middle radius + ulna
I: base of middle of 1st MC
N: radial
A: abductor thumb