A system of human anatomy, general and special . Surface.—Upon the internal surface is a crucial ridge,which divides the bone into four fossae; the two superior or cerebralfossae lodging the posterior lobes of the cerebrum; and the two in-ferior or cerebellar, the lateral lobes of the cerebellum. The superiorarm of the crucial ridge is grooved for the superior longitudinal sinus, * The external surface of the occipital bone. 1. The superior curved line. 2. Theexternal occipital protuberance. 3. The spine. 4. The inferior curved line. 5. Theforamen magnum. 6. The condyle of the right side. 7. T
A system of human anatomy, general and special . Surface.—Upon the internal surface is a crucial ridge,which divides the bone into four fossae; the two superior or cerebralfossae lodging the posterior lobes of the cerebrum; and the two in-ferior or cerebellar, the lateral lobes of the cerebellum. The superiorarm of the crucial ridge is grooved for the superior longitudinal sinus, * The external surface of the occipital bone. 1. The superior curved line. 2. Theexternal occipital protuberance. 3. The spine. 4. The inferior curved line. 5. Theforamen magnum. 6. The condyle of the right side. 7. The posterior condyloid fossa,in which the posterior condyloid foramen is found. 8. The anterior condyloid foramenconcealed by the margin of the condyle. 9. The transverse process; this process uponthe internal surface of the bone forms the jugular eminence. 10. The notch in front ofthe jugular eminence which forms part of the jugular foramen. 11. The basilar , 12. The rough projections into which the odontoid ligaments are OCCIPITAL BONE. 63 and gives attachment to the falx cerebri; the inferior arm is sharpand prominent, for the attachment of the falx cerebelli, and slightlygrooved, for the two occipital sinuses. The transverse ridge givesattachment to the tentorium cerebelli, and is deeply grooved, for thelateral sinuses. At the point of meeting of the four arms is a pro-jection, the internal occipital protuberance, which corresponds withthe similar process situated upon the external surface of the convergence of the four grooves forms a slightly depressed fossa,upon which rests the torcular Herophili. In the centre of the basilarportion of the bone is the foramen magnum, oblong in form, andlarger behind than before, transmitting the spinal cord, spinal accessorynerves, and vertebral arteries. Upon the lateral margins of the fora-men magnum are two rough eminences, which give attachment to theodontoid ligaments, and immediately above these the
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
