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Article
December 1948

SURGICAL ANATOMY OF THE ANAL CANAL

Author Affiliations

BOSTON
From the Surgical Service, Peter Bent Brigham Hospital, and the Department of Surgery, Harvard Medical School.

Arch Surg. 1948;57(6):791-800. doi:10.1001/archsurg.1948.01240020801003
Abstract

THE DESCRIPTIONS of anal anatomy in current textbooks on surgery and proctology are remarkably diverse. Not only are there departures in terminology, but in many instances details of considerable surgical significance are not given proper emphasis or are omitted entirely. The need for clear and uniform concepts has led to this presentation of the essential points with which he who ventures to dissect the nether parts of his fellow man should be familiar. It is based on certain fundamental contributions to this subject,1 tempered by a personal study of postmortem and surgical material.

THE ANAL MUSCULATURE  The four muscles of importance in anal surgery are the external sphincter, the internal sphincter, the longitudinal muscle and the levator ani. It is amazing how frequently the relationship of these muscles is misrepresented, despite the thorough and conclusive studies of Milligan and Morgan,1a Blaisdelllb and others. The proper relationship is

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