anal canal lymphatic drainage
Chapter 36: The rectum and anal canal
Chapter The rectum and anal canal Rectum At the level of the middle of the sacrum, venous and lymphatic drainage, and possibly lining epithelium. The anal canal is the terminal part of the large intestine. It is situated between the rectum and anus, below the level of the pelvic diaphragm. The anal canal is the terminal part of the gastrointestinal tract. Anatomically, the anal canal is referred to as the terminal alimentary tract .
The interval between the internal and external sphincters may be marked by a white line. The pelvis is innervated chiefly by the sacral and coccygeal spinal nerves and by the pelvic part of the autonomic nervous system. The upper part of the rectum drains into the inferior mesenteric nodes; the lower part, together with the upper part of the anal canal, drains into the internal iliac nodes; and the lower part of the anal canal, together with the external genitalia, drains into the inguinal nodes. The lateral sacral arteries, which give off spinal branches, supply the sacrum and coccyx. Pages with unresolved properties. Motor fibers are shown in red, parasympathetic fibers as interrupted lines, and sensory fibers in blue. As discussed above, the pectinate line divides the anal canal into two parts — which have a different arterial supply, venous drainage, innervation and lymphatic drainage.
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