What is the area under the armpit called?

The area under the armpit is medically known as the axilla. The axilla is a triangular space located beneath the juncture of the arm and chest that serves as an important conduit for nerve fibers, veins, lymph nodes, arteries, and muscles leading from both above and below. It is also home to various sweat glands which help cool the body down by releasing moisture onto our skin during hot weather or when we are exerting ourselves in physical activity.

The main vessels found within this region are those related to our cardiovascular system; namely the axillary vein, brachial artery and cephalic vein. Additionally, there are several other minor vessels located here such as lymphatics that aid in filtering blood throughout our circulatory systems. Additionally, groups of nerves (i.e., ulnar nerve) surround these structures providing sensation to our arm and hand regions while carrying impulses from the brain to coordinate muscular contractions related to movement control. Finally this region contains numerous types of sensory receptors responsible for registering touch sensations in order to determine pressure level or surface texture on nearby surfaces—this allows us better perceive pain or pleasure factors on contact with surrounding objects or people!