Test your knowledge: the wrist again!

Question:

Which sentences are true, which are false? 

A. Guyon’s canal is the place where only the deep branches of the ulnar artery and nerve passing the wrist; 
B. The extensor pollicis longus and the abductor pollicis longus are forming one compartment in the wrist; 
C. The palmaris longus tendon is always present; 
D. The extensor carpi ulnaris covers the TFCC (Triangular Fibro Cartilage Complex); 
E. The median nerve is lying superficial to the flexor tendons when it is passing the carpal tunnel; 
F. During dorsiflexion of the wrist the lunate bone is sliding/ displacing to ventral. 



Answer:

The correct answers were: D, E and F 

A. The motoric and sensory branches of the ulnar nerve ánd the ulnar artery are passing the wrist in Guyon’s canal. After passing Guyon’s canal the deep branches of the ulnar nerve and ulnar artery are passing the ‘Pisiform-Hamatum’ tunnel to form the deep artery arch of the palm and the motoric innervation of some of the hand muscles;
B. The Extensor Pollicis BREVIS and the abductor pollicis longus are forming the first compartment of the wrist. Also known as the tendons which are causing problems with the thumb, called Quervain’s disease; 
C. The palmaris longus is not always present, in about 1/3th of all individuals this tendon is not present.