. On the anatomy of vertebrates [electronic resource] . Anterior view of the female pelvis. Transverse .Oblique Antero-posterior . OUTLET. Transverse .Antero-posterior . 64 64 0 15 04 5 In Man alone are the boundaries of the superior outlet on oneplane: the section through the ilium, in fig. 400, shows this to bedue to the direction of the body of the pubis, which is on the same OSTEOLOGY OF BIMANA. 577 plane with that of the cotylo-sacral tract of the ilium. In thissection, a a is the line of fulcrum falling in the transverse verticalplane of the trunk; c c
. On the anatomy of vertebrates [electronic resource] . Anterior view of the female pelvis. Transverse .Oblique Antero-posterior . OUTLET. Transverse .Antero-posterior . 64 64 0 15 04 5 In Man alone are the boundaries of the superior outlet on oneplane: the section through the ilium, in fig. 400, shows this to bedue to the direction of the body of the pubis, which is on the same OSTEOLOGY OF BIMANA. 577 plane with that of the cotylo-sacral tract of the ilium. In thissection, a a is the line of fulcrum falling in the transverse verticalplane of the trunk; c c is the line of weight passing through thecentre of the sacro-iliac joint; b bf is the line of power, or pubicprojection, giving attachment to the extensor muscles of the thigh;d d! is the line of sacral projection; e f gives the cotylo-sacral 400 401. Section through cotylo-sacral arch: Human pelvis, ov. Angles of inclination and axes: Female pelvis, cv. curve; a b is the pubic arm of the lever; a c is the cotylo-sacral arm; ad gives the length of the gluteal arm ; c d/ thatof the posterior spinal arm. In the diagram, fig. 401, the linesa e, e c, mark the angle of inclination of the pelvis, or the 6 pelvi-vertebral angle; f g d gives the inferior angle of inclination ofthe pelvis, which is about 10° with the horizon, g d. The twolines of the superior and inferior planes, when prolonged ante-riorly, cut each other at c, and include an angle of about 50°,e cf. The ( sacro-vertebral angle is shown at a e i, which isabout 117° in the male and 130° in the female. The angle a b k,VOL. II. p p 578 ANATOMY OF VERTEBRATES. taken through the long diameter of the pubic symphysis, is thecomplementary angle of the sacro-vertebral one in the female,owing to the general parallelism of the pubic with the sacralwall of the £ true pelvis. The c
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