. Quain's Elements of anatomy. r the superior longitudinal sinus, by shallow cerebral impressions, bysmall ramified meningeal grooves, and by Pacchionian fossae of varying depth. Theonly apertures in the roof of the skull are the inconstant parietal foramina, whichopen by the side of the longitudinal sulcus posteriorly ; they give passage to emissaryveins, and occasionally a branch of the occipital artery. The internal base of the skuU is divided into three fossse, named anterior,middle, and posterior. INTERNAL BASE OF THE SKULL. 69 The anterior fossa, formed by the orbital plates of the front
. Quain's Elements of anatomy. r the superior longitudinal sinus, by shallow cerebral impressions, bysmall ramified meningeal grooves, and by Pacchionian fossae of varying depth. Theonly apertures in the roof of the skull are the inconstant parietal foramina, whichopen by the side of the longitudinal sulcus posteriorly ; they give passage to emissaryveins, and occasionally a branch of the occipital artery. The internal base of the skuU is divided into three fossse, named anterior,middle, and posterior. INTERNAL BASE OF THE SKULL. 69 The anterior fossa, formed by the orbital plates of the frontal bone, thecribriform plate of the ethmoid, and the small wings and part of the body of thesphenoid, supports the frontal lobes of the cerebrum. It is convex laterally abovethe orbits, but sinks into a hollow over the cribriform plate of the ethmoid, in themiddle line of which the crista galli stands up, separating the deep olfiictory groovesfor the reception of the olfactory bulbs. In front of the crista galli is the foramen. Fig. 7L- -Sagittal section of the adult skull a little to the left of the median plane.(Allen Thomson.) ^ 1, nasal bone ; 2. perpendicular plate of the ethmoid with olfactory foramina and gi-ooves at itsupper part: 3, vomer; 4, right superior maxillary bone, forming part of the wall of the right nasalfossa ; below this is the anterior extremity of the right inferior turbinate bone overhanging x, whicliis the right inferior meatus of the nose ; 5, crista galli ; 6, inner surface of the frontal bone ; 7, of theparietal bone ; 8, squamous jjart of the temjioral ; 9, on the occipital bone below the internal occipitalprotuberance ; 10, external occipital protuberance ; 11, on the condylar process lielow the con-ilylar foramen ; 12, on the jMsterior surface of the petrous below the internal auditory meatus ; between9 and 12. the groove of the right lateral sinus; 13, placed above the sella turcica; 14, left frontalsinus ; 15, left sphenoidal sinus, t
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectanatomy
