The anatomist's vade mecum : a system of human anatomy . ifteen and twenty. The pieces unite at an earlierperiod than the bodies of the sacrum, the first two pieces first, thenthe third and fourth, and lastly the second and third. Between fortyand sixty years, the coccyx becomes consolidated with the sacrum;this event taking place later in the female than in the male. Articulations.—With the sacrum. Attachment of Muscles.—To three pairs, and one single muscle;gluteus maximus, coccygeus, posterior fibres of the levator ani, andsphincter ani. OCCIPITAL BONE. 21 OF THE SKULL. The skull, or superi
The anatomist's vade mecum : a system of human anatomy . ifteen and twenty. The pieces unite at an earlierperiod than the bodies of the sacrum, the first two pieces first, thenthe third and fourth, and lastly the second and third. Between fortyand sixty years, the coccyx becomes consolidated with the sacrum;this event taking place later in the female than in the male. Articulations.—With the sacrum. Attachment of Muscles.—To three pairs, and one single muscle;gluteus maximus, coccygeus, posterior fibres of the levator ani, andsphincter ani. OCCIPITAL BONE. 21 OF THE SKULL. The skull, or superior expansion of tlie vertebral column, is divisibleinto two parts,—the cranium and the face; the former being adapted,by its form, structure, and strength, to contain and protect the brain,and the latter the chief organs of sense. The Cranium is composed of eight separate bones; viz. theOccipital, Two temporal. Two parietal, Sphenoid, Frontal, Ethmoid. Occipital Bone.—This bone is situated at the posterior part and Fig. 11.* Ys>X^-^^^^ I/; J. base of the cranium. It is trapezoid in figure, and divisible into twosurfaces, four borders, and four angles. External Surface.—Crossing the middle of the bone transversely,from one lateral angle to the other, is a prominent ridge, the superior * The external surface of the occipital bone. 1. The superior curved The external occipital protuberance. 3. The spine. 4 The inferiorcurved line. 5. The foramen magnum. 6. The condyle of the right The posterior condyloid fossa, in which the posterior condyloid foramenis found. 8. The anterior condyloid foramen, concealed by the margin ofthe condyle. 9. The transverse process; this process upon the internal sur-face of the bone forms the jugular eminence. 10. The notch in front of thejugular emmencewhich forms part of the jugular foramen. 11. The basilarprocess. 12. The rough projections into which the odontoid ligaments areinserted. 22 OCCIPITAL BONE. curved line. In t
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