anococcygeal

Behind it is a mass of muscular and fibrous tissue, the anococcygeal body (Symington); in front of it, in the male, but separated by connective tissue from it, are the membranous portion and bulb of the urethra, and the fascia of the urogenital diaphragm; and in the female it is separated from the lower end of the vagina by a mass of muscular and fibrous tissue, named the perineal body.

XI. Splanchnology. 2h. The Large Intestine 1918

The superficial, constituting the main portion of the muscle, arises from a narrow tendinous band, the anococcygeal raphé, which stretches from the tip of the coccyx to the posterior margin of the anus; it forms two flattened planes of muscular tissue, which encircle the anus and meet in front to be inserted into the central tendinous point of the perineum, joining with the Transversus perinæi superficialis, the Levator ani, and the Bulbocavernosus.

IV. Myology. 1F. The Muscles and Fasciæ of the Perineum 1918

Behind are the anococcygeal body, the pelvic surfaces of the coccyx and lower end of the sacrum, and the sacrospinous ligaments (Fig. 1228).

XII. Surface Anatomy and Surface Markings. 10. Surface Markings of the Perineum 1918

The fibers pass downward and backward to the middle line of the floor of the pelvis; the most posterior are inserted into the side of the last two segments of the coccyx; those placed more anteriorly unite with the muscle of the opposite side, in a median fibrous raphé (anococcygeal raphé), which extends between the coccyx and the margin of the anus.

IV. Myology. 6e. The Muscles and Fasciæ of the Pelvis 1918

The Iliococcygeus arises from the ischial spine and from the posterior part of the tendinous arch of the pelvic fascia, and is attached to the coccyx and anococcygeal raphé; it is usually thin, and may fail entirely, or be largely replaced by fibrous tissue.

IV. Myology. 6e. The Muscles and Fasciæ of the Pelvis 1918