The anatomy of the anus

From Wikipedia, the free encyclopedia. Bright red blood from the anus is sometimes from hemorrhoids, but requires evaluation to rule out a more serious cause. Doctors may use surgery, freezing cryotherapy , a laser or heat probe, or other treatments to remove warts from the anus. In the upper third of the rectum, its front and sides are covered by peritoneum; in its middle third, the front only; its lower third is devoid of peritoneum. Medicine infobox template using GraySubject or GrayPage Medicine infobox template using Dorlands parameter. In ectopic anus, the anus is misplaced, usually anteriorly in the perineum in males or in the vagina in females. Pharynx Muscles Spaces peripharyngeal retropharyngeal parapharyngeal retrovisceral danger prevertebral Pterygomandibular raphe Pharyngeal raphe Buccopharyngeal fascia Pharyngobasilar fascia Piriform sinus.

At its inferior end, the rectum tapers slightly before ending at the anus. Leatherbacks and soft-shelled turtles shell is covered with leathery skin instead. A plate-like band of muscles, called the levator ani muscles, surround the anus and form the floor of the pelvis. Antibiotics and surgical drainage may be required to effectively treat an abscess of the anus.