The Surgical Anatomy of the Anal Canal and Rectum.
نویسنده
چکیده
In the early embryo the allantois, which lies in the body stalk, is situated at the hind end of the foetus and is at first meirely a continuation of the hind gut. As growth proceeds, the hind end of the embryo assumes a curvature and the allantois and body stalk are displaced ventrally. The differentiation of the allantois and hind gut is now easy to see and the sharp bend between the two becomes dilated to form the cloaca.
منابع مشابه
Black Anal Canal: Acute Necrosis
Acute ischemia of the rectum or anal canal resulting in necrosis is extremely uncommon because both the rectum and the anal canal have excellent blood supplies. We present a case with spontaneous necrosis of the anal canal without rectal involvement. Surgical debridement was accomplished, and the recovery was uneventful. The patient was elderly, with probable atherosclerotic arterial disease, a...
متن کاملNumerical distribution of lymphoid nodules in the human sigmoid colon, rectosigmoidal junction, rectum, and anal canal.
There is little information on the numerical distribution of lymphoid nodules (LN) in distal segments of the human large bowel. A novel approach was therefore developed to assess the number of LN in the sigmoid colon, the rectosigmoid segment, the rectum, and the anal canal in humans. The distal large bowel from five cadavers was selected for quantitative study. The number of LN was scored macr...
متن کاملHisto-topographic study of the longitudinal anal muscle.
The longitudinal anal muscle (LAM) has been described as a vertical layer of muscular tissue interposed between the circular layers of the internal (IAS) and external (EAS) anal sphincters. There is, however, no general agreement in the literature on its composition and attachments. The aim of this study was to investigate the histological structure, attachments, and topography of the LAM in or...
متن کاملTransrectal ultrasonography of anorectal diseases: advantages and disadvantages
Transrectal ultrasonography (TRUS) has been widely accepted as a popular imaging modality for Epub ahead of print evaluating the lower rectum, anal sphincters, and pelvic floor in patients with various anorectal diseases. It provides excellent visualization of the layers of the rectal wall and of the anatomy of the anal canal. TRUS is an accurate tool for the staging of primary rectal cancer, e...
متن کاملDigestive system anatomy of the Acipenser persicus: New features
Sturgeon is one of the most important species of the Caspian Sea aquatics. Unfortunately, this species faces the threat of extinction today. This makes specific studies on any type of sturgeons more important than before. Studies like histological studies, radiology, and sonography, all require a complete understanding of the anatomy of this fish. Since pilot studies showed some misconceptions ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Postgraduate medical journal
دوره 12 130 شماره
صفحات -
تاریخ انتشار 1936