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Sphincters. Anatomy of the lower rectum and anus showing the muscle sphincters. The internal anal sphincter is made of smooth muscle. The external anal sphincter is made up of skeletal muscle. Slice vectors
Sphincters. Anatomy of the lower rectum and anus showing the muscle sphincters. The internal anal sphincter is made of smooth muscle. The external anal sphincter is made up of skeletal muscle. Slice vectors