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Laboratory 42. The Male Perineum and the Penis
Step 13. The External Anal Sphincter

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Examine the external anal sphincter muscle which encircles the anal canal. Identify again the branches of the inferior rectal nerve and vessels, which supply this muscle and lower part of the anal canal.

Links and References:
Grant's: 3.61
Netter (1ed.): 359 (2ed.): 355
Rohen/Yokochi: 329