Radial Nerve

Question 1

Radial Nerve Formed in the

Answer 1

Axilla

Question 2

Branches of Radial Nerve in the Axilla

Answer 2

Branches to Medial and Long Head of Triceps

In the Axilla

Question 3

From Axilla, Radial nerve enters Posterior compartment of Arm by passing through

Answer 3

Lower Triangular Interval

Question 4

In the Posterior Compartment of Arm, Radial nerve get accompanied by

Answer 4

Profunda brachii artery

Question 5

In the Posterior Compartment of Arm Radial nerve passes through

Answer 5

Spiral Groove

Question 6

Branches of Radial nerve in the posterior compartment of arm

Answer 6

Branches to Medial and Lateral head of Triceps

Branch to medial head also supplies Anconeus muscle

Question 7

Injury at lower aspect of Spiral Groove;

Intact muscles -

Intact movements -

Answer 7

Intact muscles -

• Triceps muscle
• Anconeus muscle

Intact movements - extention of elbow

Question 8

Action of Triceps

Answer 8

Triceps attached to Olecranon process of Ulna -

Extension of Elbow (assisted by Anconeus muscle)

Question 9

Radial nerve in the lower part of arm present between

Answer 9

Brachialis and Brachioradialis

Question 10

Radial Nerve Branches in Elbow

Answer 10

Motor Branches to -

Brachialis (hybrid muscle)
Brachioradialis
ECRL

Question 11

Radial nerve below the Elbow Joint divides into

Answer 11

Superficial (sensory) Branch

Deep (motor) Branch

Question 12

Deep (motor) branch of Radial Nerve is also known as

Answer 12

Posterior interosseous nerve

Question 13

Posterior interosseous nerve reaches posterior compartment of forearm after piercing the

Answer 13

Supinator muscle

Question 14

Posterior interosseous nerve supplies all the muscles of posterior compartment of forearm
Except;

Answer 14

Anconeus

Brachioradialis

ECRL - extensor carpi radialis longus

Question 15

Low radial nerve palsy means

Answer 15

Injury to radial nerve -

Below the elbow before its division into superficial and deep

Question 16

Low radial nerve palsy;

Intact muscles -

Intact movement -

Answer 16

Low radial nerve injury;

Intact muscles -

• triceps
• anconeus
• brachialis
• brachioradialis
• ECRL

Intact movement -

• extension of elbow
• extension of wrist

Question 17

Why wrist drop is not seen in Low Radial Nerve Palsy

Answer 17

Because ECRL is intact

It supplied by Radial Nerve above the Elbow Joint

Question 18

Function lost in Low Radial Nerve Palsy;

Answer 18

Loss of Extension of MetacarpoPhangeal Joint ~ deep branch affected

Sensory Loss ~ superficial branch affected

Question 19

Posterior interosseous nerve palsy;

Normal action and Muscles intact

Answer 19

Extension of Elbow - Normal
(Triceps, Anconeus- Intact)

Extension of wrist - Normal
(ECRL-Intact)

Wrist drop not seen

No sensory loss

Question 20

Posterior interosseous nerve palsy;

Lost function -

Answer 20

Extension of MCP Joint - Lost

Finger drop

(wrist drop not seen)

(no sensory loss)

Question 21

Superficial branch of radial nerve is passing under the cover of

Answer 21

Brachioradialis muscle

Question 22

Compression of Superficial branch of radial nerve during its course under brachioradialis results into

Answer 22

Wartenberg’s Syndrome

Question 23

C/F of Wartenberg’s Syndrome

Answer 23

Loss of sensation in lateral 3 1/2 digits

Question 24

Difference between Wartenberg Syndrome & Wartenberg Sign;

Answer 24

Wartenberg sign;

The little finger - unable to adduct towards ring finger

Due to Ulnar nerve injury - affects Palmar interosseous interossei

Question 25

Extensor tendons reach upto Distal Phalanx by

Answer 25

DDE - Dorsal Digital Expansion

Question 26

Dorsal Digital Expansion Trifurcates into

Answer 26

One medial band Two lateral bands

Question 27

One medial band inserted to Action -

Answer 27

One mecial band, Crossing Interphalangeal joint posteriorly and inserted to Middle Phalanx Action - Extension of Proximal IP Joint

Question 28

Two lateral bands inserted to Action -

Answer 28

Two lateral bands unite and cross the Distal IP - Joint Posteriorly and inserted to distal phalanx Action - Extension of Distal IP Joint

Question 29

Tendons attached to DDE

Answer 29

Lumbricals Palmar interossei Dorsal interossei Are Wing tendons - attaches DDE like a wing

Question 30

Feature of Mallet Finger and is due to

Answer 30

Flexion of Distal IP - Joint; Due to Lateral band avulsion results in Mallet Finger

Question 31

Distal IP-Joint Flexion + Hyperextended Proximal IP-Joint Is _________

Answer 31

Swan - Neck Deformity

Question 32

Swan - Neck Deformity seen in

Answer 32

In Rheumatoid conditions

Question 33

Difference between Mallet Finger and Swan-Neck Deformity

Answer 33

In Mallet Finger → Only Distal IP-Joint Flexion In Swan-Neck Deformity → Distal IP-Joint Flexion + Hyperextended Proximal IP-Joint

Question 34

What is Boutonniere Deformity?

Answer 34

Flexion of Proximal IP-Joint Due to Avulsion of Medial Band

Question 35

What is Extensor Retinaculum?

Answer 35

The extensor tendons enter the dorsum through Externsor retinaculum Has 6 Compartments from Lateral to Medial

Question 36

Muscles (tendons) passing through 1st Compartment

Answer 36

Abductor pollicis longus Extensor pollicis brevis

Question 37

De Quervain’s Synovitis is due to

Answer 37

Involvement of Abductor pollicis longus and Extensor pollicis brevis Finkelstein Test Positive

Question 38

Finkelstein Test is used for;

Answer 38

To check De Quervain’s Synovitis Ask Patient to; 1. To make Fist 2. To give Ulnar Deviation If patient has severe pain over the lower end of Radius, then test is Positive

Question 39

Space between 1st and 3rd Compartment;

Answer 39

Anatomical Snuff Box

Question 40

Boundaries of Anatomical Snuff Box; Medial - Lateral -

Answer 40

Medial - 3rd compartment Lateral - 1st Compartment

Question 41

Floor of Anatomical Snuff Box

Answer 41

``` Radius, Scaphoid, Trapezium, Base of 1st Metacarpal bone, ECRL, ECRB ```

Question 42

Roof of Anatomical Snuff Box,

Answer 42

Skin, Superficial fascia, Cephalic vein, Superficial branch of radial nerve

Question 43

Content of Anatomical Snuff Box;

Answer 43

Radial Artery

Question 44

Muscle(Tendon) passing through 2nd Compartment;

Answer 44

ECRL | ECRB

Question 45

Muscle(Tendon) passing through 3rd Compartment;

Answer 45

Extensor pollicis longus

Question 46

Structures passing through 4th Compartment;

Answer 46

Extensor digitorum Extensor indicis Posterior interosseous nerve Anterior interosseous artery

Question 47

Structures passing through 5th Compartment;

Answer 47

Extensor digiti minimi

Question 48

Structures passing through 6th Compartment;

Answer 48

Extensor carpi ulnaris

Question 49

Intersection Syndrome is due to

Answer 49

Crossing of 1st and 2nd Compartments → 4-6 cm proximal to wrist joint This leads to Friction of ECRL, ECRB