Rugae is a term used in anatomy that refers to a series of ridges produced by folding of the wall of an organ. Anatomy (from the Greek anatomia, from ana separate apart from and temnein, to cut up cut open is a branch of Biology that is the consideration In Biology, an organ ( Latin: organum, "instrument tool" from Greek όργανον - organon "organ instrument Most commonly the term is applied to the internal surface of the stomach. In Human anatomy, the stomach is a J-shaped hollow muscular organ of the Gastrointestinal tract involved in the second phase of Digestion, following The stomach rugae may be seen during esophagogastroduodenoscopy or in radiological studies. They provide the stomach with a lower amount of surface area for food. When food enters the stomach, these rugae fold and become stretched in. The purpose is to allow it to expand. This therefore allows expansion in volume of the stomach without increased pressure.

Other locations that rugae appear in humans:

• Wrinkles of the scrotum
• Hard palate immediately behind the upper anterior teeth
• Urinary bladder
• Vagina
• Gallbladder

In some Male Mammals the scrotum - also 'scrutum' or 'scrootum' - is a protuberance of Skin and Muscle containing the Testicles The hard palate is a thin horizontal bony plate of the Skull, located in the roof of the mouth In Anatomy, the urinary bladder is a hollow muscular, and distensible (or elastic organ that sits on the Pelvic floor in Mammals It is the The vagina (from Latin, literally " Sheath " or " Scabbard " is a fibromuscular tubular tract leading from the Uterus The gallbladder (or cholecyst sometimes gall bladder is a small organ whose function in the body is to store Bile and aid in the digestive process

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