The corrugator cutis ani is a

muscle Skeletal muscles (commonly referred to as muscles) are organs of the vertebrate muscular system and typically are attached by tendons to bones of a skeleton. The muscle cells of skeletal muscles are much longer than in the other types of muscl ...

of the

human body The human body is the structure of a Human, human being. It is composed of many different types of Cell (biology), cells that together create Tissue (biology), tissues and subsequently organ systems. They ensure homeostasis and the life, viabi ...

, also known as the Ellis' muscle, after the anatomist

George Viner Ellis George Viner Ellis FRS (25 September 1812 Minsterworth - 25 April 1900 Minsterworth) was Professor of Anatomy at University College London and one of the foremost anatomists of his time. George Viner was the second son of Viner Ellis of Duni Hous ...

. Around the

anus The anus (Latin, 'ring' or 'circle') is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces, the residual semi-solid waste that remains after food digestion, which, d ...

is a thin stratum of involuntary muscle fiber, which radiates from the orifice. Medially the fibers fade off into the submucous tissue, while laterally they blend with the true

skin Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation. Other cuticle, animal coverings, such as the arthropod exoskeleton, have diffe ...

. By its contraction it raises the skin into ridges around the margin of the

. The name of this muscle is primarily limited to older texts.

External links

References

Muscles of the torso {{muscle-stub