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Laboratory 41. The Female Perineum
Step 6. 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 the external anal sphincter muscle and lower part of the anal canal.

Links and References:
Grant's: 3.80
Netter (1ed.): 356 (2ed.): 352
Rohen/Yokochi: 343