Muscles of the Anterior Forearm Flashcards Preview

KN 251 > Muscles of the Anterior Forearm > Flashcards

Flashcards in Muscles of the Anterior Forearm Deck (62):
1

This part of the forearm serves as an attachment site for many muscles

Interosseous membrane

2

The anterior compartment of the forearm performs what actions?

Flexion
Pronation

3

Nerves that innervate the anterior compartment of the forearm

Median and Ulnar Nerve

4

The posterior compartment of the forearm performs what actions?

Extension and supination

5

All of the muscles of the posterior compartment are innervated by

The Radial Nerve

6

Because many of the muscles of the forearm originate from the humerus, which causes the muscles in to be located where in the forearm?

What does this accomplish?

The muscles are located proximally. This allows the wrist and hand to be less bulky.

7

The 5 superficial muscles of the anterior forearm are...

1. Pronator Teres
2. Flexor Carpi Radialis
3. Palmaris Longus
4. Flexor Carpi Ulnaris
5. Flexor Digitorum Superficialis

8

All of the muscles of the anterior compartment of the forearm attach to the common flexor tendon which originates off of....

the medial epicondyle of the humerus

9

Most of the muscles of the forearm are innervated by

The median nerve

10

Round, tubular shaped muscle that extends from common flexor to halfway down the radius

Pronator Teres

11

Origin of the pronator teres

Medial epicondyle of the humerus and somewhat off the coronoid process of the ulna

12

What passes through the small opening on the pronator teres where the muscle originates?

Median nerve

13

Where does pronator teres insert?

Radius, lateral side midway down

14

What nerve innervates the pronator teres

Median nerve

15

What action is the pronator teres responsible for?

What other action can it assist with?

Pronation

Flexion at the elbow

16

Anterior muscle of the forearm that acts with the flexor carpi ulnaris to help flex the wrist

It cannot also help flex the elbow

Flexor Carpi Radialis

17

When acting alone or with extensors, what movement does the flexor carpi radialis perform?

Abducts the wrist

18

What structure is located laterally to the flexor carpi radialis?

Radial Artery

19

Where does the flexor carpi radialis insert?

The base of the 2nd and 3rd metacarpals

20

What is the sheet that carpi muscles must pass through when crossing wrist?

Flexor Retinaculum

21

What innervates the flexor carpi radialis?

Median nerve

22

This muscle lies superficial to flexor digitorrum and is fairly small, has little affect on wrist strength

Palmaris Longus (Absent in 15% of ppl)

23

What is the insertion of the palmaris longus?

Origin?

Palmar Aponeurosis

Medial epicondyle of the humerus

24

Fascia covering the palm of the hand

Palmar Aponeurosis

25

Action of the palmaris longus

Flex the wrist

26

What lies just lateral to the palmaris longus, between the palmaris longus and flexor carpi radialis?

The median nerve

27

The most medial muscle of the superficial flexors

Flexor Carpi Ulnaris

28

What action does the flexor carpi ulnaris have when working with other flexors?

What about when it acts with extensors?

Has some ability to do this because it crosses the elbow joint

Flexion

Adduct the wrist

Flex the elbow

29

What innervates the flexor carpi ulnaris?

Ulnar nerve

30

What two structures lie just laterally to flexor carpi ulnaris tendon?

Ulnar nerve and artery

31

Flexor carpi ulnaris originates off of

Medial epicondyle and some off the olecranon process

32

Where does flexor carpi ulnaris insert into?

Pisiform bone and the base of the 5th metacarpal

33

The anterior forearm muscle that divides at the wrist into 4 tendons to each finger, and is the largest of the superficial muscles

Flexor Digitorum Superficialis

34

The tendons of this muscle split as they attach into the middle phalanx, which allows the tendons of the FDP to pass through

Flexor Digitorum Superficialis

35

Origins of the flexor digitorum superficialis

Insertion of the flexor digitorum superficialis

the medial epicondyle of the humerus, the coronoid process of the ulna, the upper half of the radius

Middle phalanx of each of the four fingers

36

Flexor Digitorum Superficialis is innervated by

The median nerve (lies deep to it)

37

Flexor Digitorum Superficialis performs what actions?

Flexes the middle phalanges and
Flexes the the metacarpal phalangeal joint
Flexes the wrist

38

The three deep muscles of the anterior forearm

Flexor Pollicis Longus
Flexor Digitorum Profundus
Pronator Quadratus

39

Do the deep muscles of the forearm cross the elbow joint and therefore originate on the common flexor tendon?

No!

40

Deep muscle of the forearm that lies along the radius and flexes the distal phalanx of the thumb and the proximal phalanx, and first metacarpal

Flexor Pollicis Longus

41

The only muscle that flexes the interphalengeal joint of the thumb

Flexor Pollicis Longus

42

What is the origin of the flexor pollicis longus?

The anterior surface of the radius and the interossesous membrane

43

What is insertion of the flexor pollicis longus?

Distal Phalanx of the thumb

44

What is it innervated by?

Median nerve

45

What is the main action of the flexor pollicis longus?

Flexes the distal phalanx of the thumb

46

The large deep muscle of the forearm located medial to the flexor pollicis longus

Flexor Digitorum Profundus

47

Origin of the flexor digitorum profundus

The ulna and the interosseus membrane

48

Action of the flexor digitorum profundus

Flexes the distal phalanges of the four medial digits

Helps to curl fingers and flex the hand in making fist

49

What two nerves innervate the flexor digitorum profundus?

Median nerve and ulnar nerve

50

The integrity of which nerve can be tested by flexing the first finger?

The little finger?

Median nerve (lateral)

Ulnar nerve (medial)

51

A square shaped muscle that pronates the forearm, looks like a small bandage covering the lower anterior three inches of forearm

Pronator Quadrates

52

The prime mover in pronation that initiates it

Pronator Quadratus

53

What muscles assists the pronator quadratus when more speed and power is needed?

Pronator Teres

54

Origin of the pronator quadratus

Distal portion of the anterior surface of the ulna

55

Insertion of the ulna

Distal portion of the anterior surface of the radius

56

Innervates the pronator quadratus

Median nerve

57

Do the median and ulnar nerve do anything in the arm?

No. Just pass through it.

58

Anterior forearm nerve that passes anterior to the Anterior forearm nerve that passes posterior to the elbow joint (funny bone)

Median Nerve
Ulnar Nerve

59

Nerve that passes deep to the flexor retinaculum
Nerve that does not pass deep to the flexor retinaculum

Median Nerve
Ulnar Nerve

60

The passage formed by the carpal bones and the flexor retinaculum where all long flexor tendons to the digits and thumb, and where median nerve passes through

Carpal Tunnel

61

Flexor retinaculum is attached laterally to...
Medially to...

Scaphoid and trapezium
Pisiform and Hamate

62

Irritation and swelling in the synovial sheet of carpal tunnel puts pressure on the____ which can cause symptoms of carpal tunnel

Median Nerve