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Human anatomy, including structure and development and practical considerations . into the two bands already mentioned, of which the posterior is thelarger and the more concerned in bridging over the folds. The internal sphincter isbut an hypertrophy of the circular muscles, while the external sphincter is a muscleof the perineum. It has been thought advisable to here describe together themuscles and some of the fasciae of the rectum and anus, including some that arelargely extrinsic. THE MUSCLES AND FASCIA OF THE RECTUM AND ANUS. TliLlevator ani( Figs. 1423, 1424) arises from the back of the

Human anatomy, including structure and development and practical considerations . into the two bands already mentioned, of which the posterior is thelarger and the more concerned in bridging over the folds. The internal sphincter isbut an hypertrophy of the circular muscles, while the external sphincter is a muscleof the perineum. It has been thought advisable to here describe together themuscles and some of the fasciae of the rectum and anus, including some that arelargely extrinsic. THE MUSCLES AND FASCIA OF THE RECTUM AND ANUS. TliLlevator ani( Figs. 1423, 1424) arises from the back of the Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2ANC4HB

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7.1 MB (317.4 KB Compressed download)

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1980 x 1262 px | 33.5 x 21.4 cm | 13.2 x 8.4 inches | 150dpi

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Human anatomy, including structure and development and practical considerations . into the two bands already mentioned, of which the posterior is thelarger and the more concerned in bridging over the folds. The internal sphincter isbut an hypertrophy of the circular muscles, while the external sphincter is a muscleof the perineum. It has been thought advisable to here describe together themuscles and some of the fasciae of the rectum and anus, including some that arelargely extrinsic. THE MUSCLES AND FASCIA OF THE RECTUM AND ANUS. TliLlevator ani( Figs. 1423, 1424) arises from the back of the body of thepubes, about midway between the upper and lower border, very close to the middle line, and thence, from the white line formed by the splitting of the pelvic fascia, asfar as the spine of the ischium. The anterior fibres from the pubic bone pass belowthe prostate, some going to its capsule, as a strong muscular bundle to the central Ftg. 1423. Bulbo-cavernosus Ischio-cavernosus Trans, periiieisuperf. Triangular lig-ament, inf. layer Perineal centre Tuberosity ofischium. .usObturator fascia Gluteusmaximus (cut) Greater sacro-sciatic ligament Coccvx Muscles of pelvic floor and perineum from below. point of the perineum and the front and sides of the rectum, in which some of themend. The remainder of this set passes with the fibres from the white line to theside of the coccyx and to a fibrous band (ligamentum anococcyweum) running from itto the anus. This latter part of the muscle is thinner and more transversely placedthan the former. In the female the pubic portion sends some fibres to the vaginaand some around it to the central point of the perineum. The fibres, for the most 1676 HIM AN ANATOMY. part in both sexes, pass by tlie rectum so as to compress it. although some enterits walls and mingle with those of the sphincters. Nfrve. —A branch from the sacral plexus {sometimes there are more than one)runs to the levator ani on its u[)per surface. The fibres come from th

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