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ax·il·lar·y fos·sa

depression between the anterior and posterior axillary folds forming the floor of the axilla; after puberty, this is a site of hair growth and an abundance of sweat glands.
Synonym(s): fossa axillaris [TA], armpit
Farlex Partner Medical Dictionary © Farlex 2012


The hollow under the upper part of the arm at the shoulder.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


The depressed hollow region located under the shoulder joint, medial to the upper arm.
Content  Axillary vessels, including the axillary artery (the extension of the subclavian artery, which becomes the brachial artery) and the axillary vein (which arises from the brachial veins and basilica vein and becomes the subclavian vein); axillary nerves; brachial plexus; lymph nodes; fat; loose connective tissue.
Muscles, anterior to posterior Pectoralis major, deltoid, biceps brachii, coracobrachialis, teres major and latissimus dorsi, and long head of triceps.
Medical significance Site of lymphatic drainage from the arm (e.g., for melanomas) and breast (e.g., for breast cancer).
Sports injuries Axillary (nerve) damage is uncommon, but well-described in contacts sports (e.g., from collisions in ice hockey or tackling in American football).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

Patient discussion about armpit

Q. A lump in my armpit Hi, Last week after the shower I found a small painful lump in my right groin. I went to see a doctor and he prescribed me some antibiotics. I’ve been taking it for 5 days and the lump is still there. I’m 31, usually healthy and work-out in the gym regularly, don’t smoke or use drugs and don’t take any medications. Is that dangerous? Should I go and see another doctor?

A. What you describe sounds like enlarged lymph node. The first diagnosis that’s suspected in such case is an infection that makes it painful. The antibiotics you take need several more days to act, so currently it doesn’t sound suspicious. If the lump persist, it’d be wise to consult you doctor

Q. I located a lump on the surface of my right underarm. I think I am showing some signs of breast cancer. I am 27 years old working lady. I think I am showing some signs of breast cancer. I located a lump on the surface of my right underarm. This lump is of a cherry size and does not pain at all. But I do have pain in my breast. I had my mammogram done which showed no lump and my doctor says that there is nothing to worry and she has given me some medicines. I want to know that if everything is normal then how come these lumps came.

A. there are ways to diagnose if lumps are breast cancer or not. a lump under the forearm can be a sign of an advanced stage of cancer, but it can also mean some kind of viral infection that caused a lymph node to swell up. so if a doctor told you it's fine- he probably checked it out, and it's fine. if you still anxious - go get a second opinion.

More discussions about armpit
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References in periodicals archive ?
People with hyperhidrosis sweat excessively, especially from their hands, feet, and armpits. If your doctor thinks you might have this condition, there are tests they can do to confirm a diagnosis, ensuring it gets treated properly.
Those confident about flashing their blemish-free armpits may want to check it out for a career in modeling.
"This study, along with our previous research revealing that only a small number of the bacteria in our armpits are actually responsible for bad smells, could result in the development of more targeted products that aim to inhibit the transport protein and block the production of BO."
Last week, a photographer sparked the debate again when he snapped dozens of models and actresses baring hairy armpits.
In defense of the ad, Unilever senior marketing director for antiperspirants and deodorants Matthew McCarthy told The New York Times that the message intended to mitigate the negative image of armpits. He also apologized on behalf of the company for any offense and misunderstanding caused by the message.
All of the women in the study met the same criteria: Their tumors were in the early T1 or T2 stage (meaning they were no more than 5 centimeters in size), and biopsies of one or two armpit nodes had shown cancer, although the cancer had not spread to any other body parts.
Cheryl reckoned the armpit thing was too much of a niche market, but conceded it might be a 'goer, Pet' in Egypt and Morocco, if I could incorporate belly-dancers.
She fell back onto a table with one glass, which shattered and pierced her left armpit severing an major artery.
Fireman Iain McElhone was found not guilty of brandishing a banana at Kulwinder Singh Sidhu and scratching his armpit in what was said to be a "monkey impression".
To quote the review of the hardcover in KLIATT, January 2006: Sachar's Holes won the National Book Award and the Newbery Medal, among other honors, and YAs, teachers and librarians will be eager for this new novel, which features the character Armpit from Holes.
The apocrine glands located in the armpit and groin do not begin working until the teenage years, and their fluid is milky and viscous.