Session 30 - The Post 4arm and Dorsum of the Hand, Joints of the Upper Limb

Question 1

Which nerve supplies the muscles in the posterior forearm? Which region of skin
in the hand does this nerve also innervate?

Answer 1

Radial

Dorsal surface of lateral hand
Skin over dorsum of the lateral 3.5 digits as far as the DIP joints (Distal interphalangeal joints)

Question 2

Which bone lies in the floor of the anatomical snuffbox?

Answer 2

Scaphoid

Question 3

Which neurovascular structures are associated with the anatomical snuffbox?

Answer 3

Radial artery
Cephalic vein
Superficial radial nerve

Question 4

In a patient with a T1 nerve root injury, which muscles will be weak / paralysed?
Which area of skin will be affected?

Answer 4

 The small muscles of the hand will be weak / paralysed.

 There will be sensory impairment over the medial arm

Question 5

Which muscle of the upper limb is the most powerful supinator of the forearm?
How does the position of the elbow joint affect the action of this muscle?

Answer 5

Biceps is most powerful supinator

But only when elbow is flexed

Question 6

Which fingers have two extensor muscles and tendons?

Answer 6

Index finger
Extensor digitorum and extensor indicis
Little finger
Extensor digitorum and extensor digiti minimi

Question 7

Look at A4 Document

Answer 7

:-)