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The human anal glands are situated within the wall of the anal canal [10] and communicate with the lumen of the canal via ducts that open at the anal valves, just proximal to the pectinate line. Humans have 12 anal glands on average (which are evenly distributed around the circumference of the anal canal). [ 4 ]
In humans, the anus (pl.: anuses or ani; from Latin ānus, "ring", "circle") [1] [2] is the external opening of the rectum located inside the intergluteal cleft. Two sphincters control the exit of feces from the body during an act of defecation, which is the primary function of the anus.
In humans, the buttocks are located between the lower back and the perineum. They are composed of a layer of exterior skin and underlying subcutaneous fat superimposed on a left and right gluteus maximus and gluteus medius muscles. The two gluteus maximus muscles are the largest muscles in the human body.
Pinworm infection (threadworm infection in the UK), also known as enterobiasis, is a human parasitic disease caused by the pinworm, Enterobius vermicularis. [3] The most common symptom is pruritus ani, or itching in the anal area. [1]
Sexual swellings are concentrations of tumescent tissue, cyclically appearing on the genitalia and adjacent posterior regions of female primates. The exact reproductive purpose of sexual swellings is not fully understood, though the erogenous sensitivity of this tissue is known to motivate females to pursue sexual contact with males. [10]
Scientists in China studied the genetics of multiple pandas in the wild and in captivity to understand why some pandas have a brown-and-white coat. Pandas aren’t all black and white.
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The hemipenis is the intromittent organ of Squamata, [4] which is the second largest order of vertebrates with over 9,000 species distributed around the world. They differ from the intromittent organs of most other amniotes such as mammals, archosaurs and turtles that have a single genital tubercle, as squamates have the paired genitalia remaining separate. [5]