You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All of the following forms the boundaries of the lower triangular space of arm, EXCEPT: and explain in detail?
Boundaries of lower triangular space of arm are: medially it is bounded by long head of triceps, laterally by medial border of humerus and superiorly by teres major. Radial nerve and profunda brachii vessels are the contents of the lower triangular space. Ref: Human anatomy by B.D Chaurasia, 4th Edition, Vol 1 Page 81