Upper Limb Revision – Blood supply and muscles of the forearm

Upper Limb Revision – Blood supply and muscles of the forearm


Knocks. Come in. Take a seat. Thank you. So, what can i do for you today? I’ve been getting pain in my left arm since my rugby game last weekend and I’ve been struggling to pick things up with that hand. Okay, have you ever dislocated or broken this arm before? I have dislocated my shoulder before, but not to the point where my wrist looks a bit floppy. OK. Can I compare it against your other arm? Yeah. Sure. OK. Can you try extending the left arm as well for me Yeah. OK. Let’s send you off for some scans and see what’s happening The blood supply to the upper limb originates from the right and left subclavian arteries. Each becomes the axillary artery at the level of the 1st rib. At the lower border of the teres major muscle the axillary becomes the brachial artery, which passes through the cubital fossa where it splits into the radial and ulnar arteries which descend down the forearm. In total 4 nerves originating from the Brachial plexus innervate the arm and forearm muscles. These include the Musculocutaneous nerve which innervates Biceps Brachii Brachialis and Coracobrachialis located on the anterior arm. The Radial nerve innervates the Triceps as well as all the muscles found in the posterior forearm The median nerve innervates all muscles within the anterior
forearm, excluding the Flexor Carpi Ulnaris and the medial half of the Flexor Digitorum Profundus which is innervated by the Ulna nerve. OK. From the scans it does definitely looks like radial nerve damage, So the radial nerve supplies all of these muscles There are 12 muscles in total in the posterior forearm. These include 6 superficial and 6 deep. The superficial consist of the Brachioradialis Extensor Carpi Radialis longus and the Extensor Carpi Radialis Brevis Extensor Digitorum Extensor Digiti Minimi Extensor Carpi Ulnaris Anconeus The Supinator is the first of the deep muscles and has 2 heads. Abductor Pollicis Longus Extensor Pollicis Longus Extensor Pollicis Brevis And lastly, Extensor Indicis I’m going to prescribe you ibuprofen for now to relieve the pain and inflammation. I’m also going to refer you to a physiotherapist who will give you some strengthening exercises for the muscles. It should relieve itself in around 3 months. But if it doesn’t, we may need to send you for surgery. So if you book another appointment for in about 3 months and then we’ll assess the progress then. OK. Thank you.

Leave a Reply

Your email address will not be published. Required fields are marked *