Dissection of the forearm Flashcards Preview

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Flashcards in Dissection of the forearm Deck (38):
1

Name the common flexor origin

Medial epicondyle of the humerus

2

Name the superficial flexor muscles

Palmaris longus
Flexor carpi radialis
Flexor carpi ulnaris
Pronator teres

3

Name the intermediate flexor muscle

Flexor digitorum superficialis

4

Where does palmaris longus originate and insert?

Origin: Medial epicondyle
Insertion: Palmar aponeurosis

5

Where does flexor carpi radialis originate and insert?

Origin: Medial epicondyle
Insertion: 2nd and 3rd metacarpal bones

6

Where does flexor carpi ulnaris originate and insert?

Origin: Medial epicondyle
Insertion: Pisiform bone and 5th metacarpal

7

Where does pronator teres originate and insert?

Origin: Medial epicondyle
Insertion: Radius

8

Where does flexor digitorum superficialis originate and insert?

Origin: Medial epicondyle
Insertion: Proximal interphalangeal joint

9

Name the 3 deep flexors of the forearm

Flexor digitorum profundus
Flexor pollicis longus
Pronator quadratus

10

Where does flexor digitorum profundus originate and insert?

Origin: Medial epicondyle
Insertion: Distal phalanges

11

Where does flexor pollicis longus originate and insert?

Origin: Medial epicondyle
Insertion: Distal phalanx of digit 1

12

Where does pronator quadratus originate and insert?

Origin: Distal end of ulna
Insertion: Distal end of radius

13

What is the function of flexor retinaculum?

strong band of fibrous connective tissue
that crosses the wrist and holds the long tendons firmly in place and prevents them from
‘bowstringing’

forms the roof of the carpal tunnel

14

What is the carpal tunnel?

a fibro-osseous tunnel containing the tendons of the superficial and deep flexors as well as
the median nerve

15

What does the brachial artery divide into and where?

Radial and ulnar arteries at the cubital fossa

16

Which muscle overlies radial artery?

Brachioradialis

17

Which muscle overlies ulnar artery?

Flexor carpi ulnaris

18

Name the branch at the proximal end of the ulnar artery

Common interosseous artery

19

What does the common interosseous artery divide into?

anterior and posterior interosseous arteries.

20

Where are the interosseous arteries located?

These arteries run down each side of the
interosseous membrane, which lies between the radius and ulna.

21

At the hand which artery is superficial?

Ulnar

22

Describe the travel of the radial artery

After passing below brachioradialis, winds dorsally at the wrist and crosses the anatomical snuffbox

23

Describe the travel of the ulnar nerve

Passes through the cubital tunnel to gain
access to the forearm.
It travels down the forearm under cover of flexor carpi ulnaris,which it supplies, lying medial to the ulnar artery
As the nerve crosses the wrist it lies superficial to
the flexor retinaculum.
Within the hand it divides into a deep and superficial branch

24

What does the ulnar nerve supply?

flexor digitorum profundus.
many of the intrinsic muscles of the hand,

25

Describe the travel of the median nerve

The median nerve enters the forearm between the two heads of pronator teres, continues into carpal tunnel where it lies between the superficial and deep digital
flexor tendons.

26

What does the median nerve supply?

All the muscles of the anterior compartment with the exception of flexor carpi ulnaris and the ulnar side of the deep digital flexor
Muscles in the hand forming the ball of the thumb.

27

What does the musculocutaneous nerve enter the forearm as?

lateral cutaneous nerve of the forearm

28

What does the lateral cutaneous nerve of the forearm supply?

the skin on the dorsal and ventral side of the forearm as far distally as the ball of
the thumb.

29

What is the common extensor origin?

Lateral epicondyle of the humerus

30

Give the origin and insertion of brachioradialis

Origin: Lateral supracondylar ridge of the humerus
Insertion: Styloid process of the radius

31

Give the function of brachioradialis

Flexor of forearm when half pronated

32

Give the origin and insertion of extensor carpi radialis brevis

Origin: Lateral supracondylar ridge of the humerus
Insertion: second metacarpal

33

Give the origin and insertion of extensor carpi radialis longus

Origin: Lateral epicondyle of humerus
Insertion: Base of third metacarpal

34

Where does extensor carpi ulnaris originate and insert?

Origin: Lateral epicondyle of humerus
Insertion: 5th metacarpal

35

Give the origin and insertion of extensor digitorum

Origin: Lateral epicondyle of humerus
Insertion: Middle and distal phalanges of d2-5

36

Name 2 accessory extensors

Extensor digiti minimi
Extensor indicis

37

Describe the location of the supinator

surrounds the upper third of the radius having taken origin from the ulna and the
humerus. The fibres pass behind the radius and insert into the proximal third of the
anterior aspect of the radius just proximal to pronator teres

38

Describe the radial nerve

Supplies the muscles and skin over the posterior aspect of the upper
limb.

The nerve enters the anterior compartment of the forearm from the lateral side and
supplies brachioradialis and the extensor carpi radialis longus muscles. As it crosses
supinator, it gives off a large deep branch, the posterior interosseous nerve. The deep branch pierces supinator to enter the posterior compartment of the forearm and
supplies the rest of the extensor muscles in the forearm. The superficial branch of the radial nerve carries on down the forearm under cover of brachioradialis. As it approaches the wrist the superficial branch passes deep to the tendon of brachioradialis and divides into several digital branches to supply the skin on the dorsolateral aspect of
the hand