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Laboratory 5. Axillary Region
Step 2. Axillary Artery and Cords of the Brachial Plexus

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The arm should be abducted to facilitate the cleaning of the nerves and vessels. Be careful not to cut the nerves and blood vessels contained in the axilla as superficial fascia is removed.

Note: As the superficial fascia is removed to study the nerves and blood vessels, lymph nodes of the axilla may be seen. Lymph nodes are often small and difficult to identify in a cadaveric dissection. The axillary lymph nodes consist of groups and are of clinical importance. Lymph from the arm and chest wall (including the breast) is received by these nodes (See a text book for further explanation).

Links and References:
Grant's 6.14-6.19;
Netter (1ed.): 399, 403; (2ed.): 395, 399;
Rohen/Yokochi 362, 363