A system of human anatomy, general and special . of the occipital bone are the superior, inferior, and twolateral. The superior angle is received into the interval formed by the * The internal surface of the occipital bone. 1. The left cerebral fossa. 2. The leftcerebellar fossa. 3. The groove for the posterior part of the superior longitudinal The spine for the falx cerebelli, and groove for the occipital sinuses. 5. The groovefor the left lateral sinus. 6. The internal occipital protuberance, the groove on whichlodges the torcular Herophili. 7. The foramen magnum. 8. The basilar pro
A system of human anatomy, general and special . of the occipital bone are the superior, inferior, and twolateral. The superior angle is received into the interval formed by the * The internal surface of the occipital bone. 1. The left cerebral fossa. 2. The leftcerebellar fossa. 3. The groove for the posterior part of the superior longitudinal The spine for the falx cerebelli, and groove for the occipital sinuses. 5. The groovefor the left lateral sinus. 6. The internal occipital protuberance, the groove on whichlodges the torcular Herophili. 7. The foramen magnum. 8. The basilar process,grooved for the medulla oblongata. 9. The termination of the groove for the lateralsinus, bounded externally by the jugular eminence. 10. The jugular fossa ; this fossa iscompleted by the petrous portion of the temporal bone. 11. The* superior border. inferior border. 13. The border which articulates with the petrous portion of thetemporal bone, and which is grooved by the inferior petrosal sinus. 14. The anteriorcondyloid 64 PARIETAL BONE. union of the posterior and superior angles of the parietal bones, andcorresponds with that portion of the foetal head which is called the?posterior fontanelle. The inferior angle is the articular extremity ofthe basilar process. The lateral angles at each side project into thatinterval formed by the articulation of the posterior and inferior angleof the parietal with the mastoid portion of the temporal bone. Developement.—By seven centres; four for the four parts of the ex-panded portion divided by the crucial ridge, one for each condyle,and one for the basilar process. Ossification commences in the ex-panded portion of the bone at a period anterior to the vertebrae; atbirth the four pieces are distinct; they are united at about the fifth onsixth year. After twenty, the basilar process unites with the body ofthe sphenoid. Articulations.—With six bones ; two parietal, two temporal, sphe-noid, and atlas. Fig 26.* Atta
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
