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The calyx of a crinoid.

The calyx of a crinoid.

The bony cavity supporting the lower part of the abdomen, or body.

1. The massive cup-shaped ring of bone, with its ligaments, at the lower end of the trunk, formed of the innominate bone or os coxae (the public bone, ilium, and ischium) on either side and in front, and the fifth lumbar vertebra, sacrum, and coccyx posteriorly. 2. Any basin-like or cup-shaped cavity, as the pelvis of the kidney.

Bony structure immediately below abdomen.

The basin or bony cavity forming the lower part of the abdomen.

The bony structure at the base of the abdomen.

Pelvic.

The bony cavity in the lower part of the abdomen.

The bony cavity forming the lower part of the abdomen, containing several of the internal organs.

In Vertebrates the bony cavity formed by the pelvic girdle along with the coccyx and sacrum; the expansion of the ureter at its junction with the kidney; the basal portion of the cup of Crinoids.

The part of the trunk which bounds the abdomen below. It is a large, bony, irregular, conoidal cavity,-open above and below,-which supports and contains a part of the intestines, and the urinary and genital organs; and serves, at the same time, as a fixed point for the articulation of the lower limbs, the attachment of their muscles, and the execution of their movements. The pelvis supports, behind, the vertebral column, and is sustained, before, by the ossa femorum. It is situate, in the adult, near the middle part of the body, and is composed of four broad, flat, unequally thick bones, differing much in their shape, size, and arrangement, which touch, are articulated at some part of their surface, and intimately united by means of a number of ligamentous fasciae. Of these bones, two are behind, on the median line,-the sacrum and the coccyx; the two others are before and at the sides, - the ilia. They are fellows, and unite, before, with each other. The most important parts of the pelvis, in an obstetrical point of view, are the brim and the outlet. The BRIM, Augustia abdominalis, Introitus, Apertura pelvis superior, Upper Opening or strait of the Cavity of the Pelvis, (F.) Detroit superieur, D. abdominal, is the narrow part which separates the greater pelvis from the less-the false from the true, Pelvis vera seu minor. In the well-formed woman it is elliptical, and slightly inclined forwards. Its antero-posterior, sacro-pubic or conjugate diameter, in a standard pelvis, measures 41/2 inches, but with the soft parts, 3 5/8 inches; its transverse or iliac or lateral, 5 1/4 inches, but with the soft parts 4 inches; and is oblique, Diameter of Deventer, with the soft parts, 4 5/8 inches. The OUTLET, Exitus, Inferior opening or strait, Angustia perinaealis, (F.) Detroit inferieur, D. perineal, forms the lower aperture of the pelvis. The antero-posterior diameter is here, on account of the mobility of the coccyx, 5 inches: the lateral, 4 inches. The Axis OF THE PELVIS is important to be known in obstetrics. The Axis of the Brim is indicated by a straight line drawn from the umbilicus to the apex of the coccyx ;-the Axis of the Outlet by a line drawn from the first bone of the sacrum to the entrance of the vagina. An imaginary curved line which indicates the direction of the canal of the pelvis, has occasionally been termed the curve of Carus, in consequence of its having been pointedly described by the German obstetrician.

The basin formed by the innominate bones, sacrum, and coccyx.

The sac in the kidney of which the ureter is the outlet.

The osseous structure formed by the innominate bones, the sacrum, the coccyx, and the ligaments uniting them. It articulates through the sacrum with the vertebral column, and serves as a support for the posterior limbs.

The cavity included within these bones. It is divided into a false, or superior, p., and a true, or inferior, p., by a plane passing through the promontory of the sacrum, the iliopectineal line, and the upper border of the symphysis pubis, the circumference of this plane constituting the inlet of the true p. The lower margin of the true p. is formed by the coccyx, the tuberosities of the ischia, the ascending rami of the ischia, the descending rami of the ossa pubis, and the sacrosciatic ligaments. In the female all its diameters are slightly greater than in the male.

Any basin-shaped structure or cavity. See pelvis of the kidney.

n. [Latin] The structural conformation of the bones at the base of the human trunk in the form of a basin or cavity which incloses the lower intestines, urinary organs, &c.