Superficial upper limb

Question 1

lateral antebrachial cutaneous nerve comes from the:

Answer 1

Musculocutaneous nerve

Question 2

a blood sample from the median cubital vein the needle passes slightly deep and medial; which nerve might possibly be injured?

Answer 2

Medial antebrachial cutaneous

Question 3

The vein of choice for withdrawing blood is the:

Answer 3

Median cubital

Question 4

While you are stitching up his hand, he notes that you did not have to give him an anesthetic since the area between his thumb and index finger on the dorsal side was already numb. Which nerve must have been injured (most likely by the fracture of his wrist) for this area to be numb?

Answer 4

superficial ulnar

Question 5

During insertion of an IV cannula in the median cubital vein, the patient suddenly lost feeling on the radial side of the forearm. What nerve was injured?

Answer 5

There are 3 nerves that might be damaged due to a venipuncture in the median cubital fossa. If the needle goes a bit lateral, the lateral antebrachial cutaneous nerve might be injured. This nerve is a branch of the musculocutaneous nerve which supplies the skin of the lateral side of the forearm. The patient’s symptoms (loss of feeling on the radial side of the forearm) match with an injury to the lateral antebrachial cutaneous nerve. If the needle goes a bit medial, it could injure the medial antebrachial cutaneous nerve. This nerve is a direct branch of the medial cord of the brachial plexus–it innervates skin on the medial side of the forearm. If the needle goes too deep, the median nerve might be injured. This would cause the patient to lose sensation on the palmar side of the lateral 3.5 digits.

The posterior antebrachial cutaneous nerve is a branch of the radial nerve which supplies the posterior forearm. The superficial radial nerve is a terminal branch of the radial nerve which supplies the dorsum of the hand and the dorsal side of the lateral 2.5 digits. Neither of these nerves would be affected by a venipuncture in the median cubital fossa!

Question 6

While having an IV needle inserted into the cephalic vein of the forearm, the patient suddenly screamed in pain and felt tingling in part of the skin of the forearm supplied by the nerve accompanying the vein. What nerve was injured?

Answer 6

Lateral antebrachial cutaneous

Question 7

The medial antebrachial cutaneous nerve travels

Answer 7

The medial antebrachial cutaneous nerve travels with the basilic vein for part of its course. It innervates the skin of the medial side of the forearm.

Question 8

http://www.med.umich.edu/lrc/coursepages/m1/anatomy2010/html/quizzes/practical2007/musculoskeletal/zoom_images/median_cubital_vein_copy.jpg

Answer 8

median cubital vein