Muscles of the Back of Forearm : Superficial Flashcards

1
Q

List the superficial muscles found in the back of the forearm, from lateral to medial(7)

A
  1. Brachio-radialis
  2. Extensor Carpi Radialis Longus
  3. Extensor Carpi Radialis Brevis
  4. Extensor Digitorum
  5. Extensor Digiti Minimi
  6. Extensor Carpi Ulnaris
  7. Anconeus
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Origin of brachio-radialis

A
  1. From the upper 2/3 of lateral supracondylar ridge of humerus
  2. Lateral intermuscular septum of the arm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

insertion of brachio-radialis

A

Into lateral surface of lower end of radius just above the styloid process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Nerve supply of brachio-radialis

A

Radial nerve (by a branch arising on the lateral side of the arm)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Actions of brachio-radialis

A
  1. Initiates pronation and supination of the forearm
  2. Flexion of the forearm in the midprone position (muscle of military salute)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Origin of Extensor Carpi Radialis Longus

A
  1. Lower 1/3 of lateral supracondylar ridge of humerus
  2. From lateral intermuscular septum of the arm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Insertion of Extensor Carpi Radialis Longus

A

Into the back of the base of the 2nd metacarpal bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Nerve Supply of Extensor Carpi Radialis Longus

A

Radial nerve (by a branch arising on the lateral side of the arm)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Actions of Extensor Carpi Radialis Longus

A
  1. extension of the wrist
  2. Abduction (radial deviation) of the hand
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Origin of Extensor Carpi Radialis Brevis

A

From the front of the lateral epicondyle of the humerus (common extensor origin)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Insertion of Extensor Carpi Radialis Brevis

A

Into the back of the base of the 3rd metacarpal bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Nerve supply of Extensor Carpi Radialis Brevis

A

Posterior Interosseous Nerve (the deep branch of radial nerve)
Supplies muscle before it pierces supinator muscle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Actions of Extensor Carpi Radialis Brevis

A
  1. Extension of the wrist
  2. Abduction (radial deviation of the hand)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Origin of Extensor Digitorum

A

From the front of the lateral epicondyle of the humerus (common extensor origin)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Insertion of Extensor Digitorum

A
  1. Middle slip inserts into the base of the middle phalanx
  2. Two collateral slips are inserted into the base of the terminal phalanx

on the medial 4 fingers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Nerve supply of Extensor Digitorum

A

Posterior Interosseous nerve

17
Q

Actions of Extensor Digitorum

A
  1. Extension of the MP and the IP joints of the medial 4 fingers
  2. Extension of the wrist
18
Q

Origin of Extensor Digiti Minimi

A

From the front of the lateral epicondyle of the humerus (common extensor origin)

19
Q

Insertion of Extensor Digiti Minimi

A

By a tendon which joins extensor expansion of the little finger

20
Q

Nerve supply of Extensor Digiti Minimi

A

Posterior Interosseous Nerve

21
Q

Actions of Extensor Digiti Minimi

A
  1. Extension of the joints of the moss have)
  2. Extension of the wrist joint
22
Q

Origin of Extensor Carpi Ulnaris

A
  1. From the front of the lateral epicondyle of the humerus
  2. From the posterior border of ulna (by the ulnar aponeurosis)
23
Q

Insertion of Extensor Carpi Ulnaris

A

Into the back of the base of the 5th metacarpal bone

24
Q

Nerve supply of Extensor Carpi Ulnaris

A

Posterior Interosseous Nerve

25
Actions of Extensor Carpi Ulnaris
Extension and adduction of the hand
26
Origin of Anconeus
From the back of the lateral epicondyle of the humerus
27
Insertion of Anconeus
Into the lat surface of olecranon process and the upper 1⁄4 of posterior border of ulna.
28
Nerve supply in Anconeus
Radial nerve (by a branch passing through medial head of triceps )
29
Actions of Anconeus
Extension of the elbow joint