Cubital fossa: triangles, phlebotomy and ditches
What is it? The triangular depression on the top surface of the inner elbow. Its boundaries include muscles that run through here, and the end of the humerus— the bone in our upper arm. What does it contain? It’s an important point of reference for some of the arm’s major components, such as the brachial artery. And the radial and median nerves, which innervate many muscles in the arm and hand, pass though here. Why do doctors pay close attention to it? When they measure blood pressure, they put a stethoscope over it, so they can hear blood pass through the brachial artery. And when they perform phlebotomy (taking blood for tests) they often get blood from one of the big veins that run under the skin, over the cubital fossa. What’s it named after? Its location: cubitus is Latin for elbow, and for its shape: fossa is Latin for ditch.