Posterior Forearm And Dorsal Hand

Question 1

What are the muscles of the superficial layer of the posterior forearm?

Answer 1

Brachioradialis
Extensor Carpi radialis longus
Extensor Carpi radialis brebis
Extensor digitorum
Extensor digiti minimi
Extensor Carpi ulnaris

Question 2

Origin, Insertion, Innervation and muscles actions of brachioradialis?

Answer 2

O: Supracondylar ridge
I:distal radius
In: Radial proper
MA: Aids in elbow flexion

Question 3

Origin, insertion, innervation and muscles actions of Extensor Carpi radialis Longus?

Answer 3

O:Supracondylar ridge
I: Base of second metacarpal
In: radial proper
MA: Extends and abducts wrist

Question 4

Origin, Insertion, Innervation and Muscle actions of Extensor Carpi radialis Brevis?

Answer 4

O: Common extensor tendon
I: Base of third metacarpal
In: Deep radial
MA: Extends and abducts wrist

Question 5

Origin, insertion, Innervation and Muscle actions of extensor digitorum

Answer 5

O:Common extensor tendon
I: Expansor expansion
In: Posterious interossei nerve
MA: extends all joints of 2-5 digits

Question 6

Origin, insertion, Innervation and Muscle actions of Extensor digiti minimi?

Answer 6

O: Common extensor tendon
I: Extensor digitorum separate to its own tendon
In: Posterior interossei nerve
MA: Extends all joints of 5th digit

Question 7

Origin, insertion, Innervation and Muscle actions of Extensor Carpi ulnaris?

Answer 7

O: common extensor tendon and ulna
I: base of 5th metacarpal
In:Posterior interossei nerve
MA: extends and adducts wrist

Question 8

What are the deep layer of the posterior forearm?

Answer 8

Supinator
Abductor pollicis longus 
Extensor indicis 
Extensor pollicis longus
Extensor pollicis brevis

Question 9

Origin, insertion, Innervation and Muscle actions of Supinator?

Answer 9

O: Lateral epicondyle of humerus and proximal ulna
I: Radius
In: Deep radial
MA: Supinates forearm

Question 10

Origin, insertion, Innervation and Muscle actions of Abductor pollicis longus?

Answer 10

O:IOM and radius and ulna
I:Base of the 1st metacarpal
In: Posterior interossei nerve
MA: Abducts and extends CMC joint of thumb

Question 11

Origin, insertion, Innervation and Muscle actions of Extensor indicis?

Answer 11

O: Lower part of ulna
I: Extensor digitorum tendon
In: Posterior Interossei nerve
MA: extends all joints of 2nd finger

Question 12

Origin, insertion, Innervation and Muscle actions of Extensor pollicis longus?

Answer 12

O: IOM and ulna
I: Base of distal phalanx of the thumb
In: posterior interossei nerve
MA: Extends all joints (CMC, MP, IP) of the thumb

Question 13

Origin, insertion, Innervation and Muscle actions of extensor pollicis brevis?

Answer 13

O: IOM and radius
I: Base of proximal phalanx
In: Posterior interossei nerve
MA:extends CMC, MP joints of the thumb

Question 14

What are the borders and contents of the snuff box?

Answer 14

Borders: Scaphoid formed the floor, EPL, EPB
Contents: Radial artery

Question 15

What are the characteristics of dorsal interossei?

Answer 15

4 muscles arise by 2 heads from adjacent metacarpal bases and shafts
Insert on Extensor expansion
Adduction respective finger away from the 3rd finger at the MP joints
Aid lumbricals in flexion of MP and Extension of IP
Innervated by the deep ulnar nerve