. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. Bassin sacré. arch, mais elle résiste à leur déplacement vers l'intérieur, ce qui résulterait de la pression du fémur dans le sens de la cous de ces os. L'effet de cette pression, lorsque le rendement à l'pnbes, il est indiqué dans l'de conformité qui a été appelée la rostrated bassin, résultant de l'écrasement de ces os ensemble. L'cot3'lo-arc pubien reçoit également, dans sa concavité, une partie du poids de la viscères abdominaux, bien que, à partir de l'attachement de ces derniers à la colonne vertébrale, leur poids en chef est le nom de concentra

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. sacral arch, but it resists their displacement inwards, which would result from the pressure of the femora in the direction of the necks of these bones. The effect of this pressure, when the pnbes yield to it, is shown in the de- formity which has been termed the rostrated pelvis, resulting from the crushing of these bones together. The cot3'lo-pubic arch also receives, in its concavity, part of the weight of the abdominal viscera, though, from the attachment of these to the spine, their chief weight is concentrated upon the common centre of pelvic arches, —the sacrum. The ilia are also generally supposed to support the intestines in a great measure ; but this support, on account of their great obliquity in the erect position, cannot be so important as is commonly imagined, except, as in the case of the ccecum and rectum, through peritoneal attachments. The human pelvis, when thus taken in conjunction with the thorax, forms the base of a cone, the apex of which is the neck, a disposition for supporting the contained viscera which the erect position demands, and which contrasts strongly with the structure of quadrupeds. Again, the cotylo-sacral and pubic arches on each side, united at their extremities in the acetabula, form two lateral arches, on the centres of which rest the thigh bones. Against the lateral pressure exercised by the thigh bones, these two arches, connected, at their anterior and posterior extremities, by the symphysis pubis and sacrum, form, as Mayo observes, an elastic hoop. The ischia also contribute to this resistance against lateral pressure, and form, with the two other por- tions of the innominate bones, a sort of arched tripod, on the apex of which the femur is supported. In addition to the buttresses already de- scribed, there is, placed vertically above the cotyloid cavity, a thick rib of bone, which transmits to the arched crest of the ilium, and through i

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