Final answer:
The extensor carpi radialis brevis muscle extends and abducts the wrist, inserts at the base of the third metacarpal, is innervated by the radial nerve, and receives blood supply from the radial artery.
Step-by-step explanation:
The extensor carpi radialis brevis is a muscle that plays a crucial role in extending and abducting the hand at the wrist. The insertion point of this muscle is the base of the third metacarpal bone on the dorsal surface. It is innervated by the radial nerve, which is responsible for its function. The primary action of the extensor carpi radialis brevis is to extend and abduct the wrist.
A significant portion of its blood supply comes from the radial artery as this vessel courses down the forearm. This muscle, along with others such as the extensor carpi radialis longus, extensor digitorum, and extensor carpi ulnaris, is located in the superficial posterior compartment of the forearm, which is generally involved in the extension movements of the wrist and fingers.