Archive image from page 132 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE COCCYX. 99 thin and tapering below, where they furnish attachments for the powerful sacro- tuberous ligaments ( great sacro-sciatic). The iliac articular surfaces are described as auricular in shape (facies auricularis), and overlie the lateral parts formed by the first three sacral vertebrae, though this arrangement is liable to con- siderable variation. Posterior to the auricular surface the bone is rough and pitted by three distinct depressi
Archive image from page 132 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE COCCYX. 99 thin and tapering below, where they furnish attachments for the powerful sacro- tuberous ligaments ( great sacro-sciatic). The iliac articular surfaces are described as auricular in shape (facies auricularis), and overlie the lateral parts formed by the first three sacral vertebrae, though this arrangement is liable to con- siderable variation. Posterior to the auricular surface the bone is rough and pitted by three distinct depressions for the attachment of the strong sacro-iliac ligaments. Inferiorly, the edge formed by the lateral parts of the fourth and fifth sacral vertebra? becomes gradually thinner, and at the inferior lateral angle changes its direction and sweeps medially towards the body of the fifth sacral segment. The apex, or lower end of the sacrum, is formed by the small oval body of the fifth sacral vertebra, which articulates with the coccyx. The sacral canal follows the curve of the bone; more or less triangular in shape above, it becomes compressed and flattened dorso-ventrally below. Inferiorly, its posterior wall is deficient owing to the imperfect ossification of the lamina? of the fifth, and, it may be, of the fourth sacral segments. Passing obliquely downwards and laterally from this canal into the lateral parts on either side are the four pairs of intervertebral foramina, each of which is connected laterally with a V-shaped canal which terminates in front and behind in the anterior and posterior sacral foramina. The posterior limb of the V is shorter and narrower than the anterior. The female sacrum is proportionately broader than the male, its curves are liable to great individual variation; usually it is flattened above, and somewhat abruptly curved below, as contrasted with the male sacrum, in which the curve is more uniformly distributed throughout the bone. In the female the a
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