Neuromuscular Structures of the Anterior Forearm Flashcards
Where does the median nerve enter the forearm?
Enters the forearm lateral to the brachial artery. It then heads under the Biceps brachii muscle and passes down the forearm between the FDS and FDP.
Where does the median nerve enter the carpal tunnel?
Deep to the the flexor retinaculum
Which muscle(s) does the median nerve not supply in the anterior forearm?
Flexor carpi ulnaris and medial half of flexor digitorum profundus
What does the ulnar nerve do after passing posterior to the medial epicondyle of the humerus?
Humerus the ulnar nerve enters the forearm by passing between the heads of flexor carpi ulnaris muscle.
Both the ulnar nerve and ulnar artery descend close to each other down the medial aspect of the forearm
What does the brachial artery do?
exits the ante-cubital fossa, and divides into the ulnar and radial arteries at the neck of the radius.
In the forearm ulnar artery runs distal with what?
The ulnar nerve, between flexor carpi ulnaris and flexor digitorum profundus.
It then forms the superficial palmar arch after running through the wrist.
Where does the radial artery initally start?
Starts under brachioradialis and runs over the pronator teres and flexor pollicis longus lying on the distal radius
It then enters the hand forming the deep palmar arch.
Which arterial pulse you can feel at the distal third of the forearm medial to the tendon of flexor carpi radialis muscle?
Radial arterial pulse
What is the Allen’s test?
To determine the patency of the arteries in the distal forearm (prior to sampling of arterial blood, or insertion of arterial lines), Allen’s test is used.
The reason that this is performed is because in some individuals a unilateral circulation exists in the distal forearm.
Therefore, if any cannulation is performed there is a risk of causing ischaemia (due to reduced blood flow) to the hand
Where does the ulnar nerve lie in relation to the ulnar artery at the wrist?
Medial
