The Edinburgh dissector, or, System of practical anatomy : for the use of students in the dissecting room / by a Fellow of the College of Surgeons of Edinburgh.
- Date:
- 1837
Licence: Public Domain Mark
Credit: The Edinburgh dissector, or, System of practical anatomy : for the use of students in the dissecting room / by a Fellow of the College of Surgeons of Edinburgh. Source: Wellcome Collection.
Provider: This material has been provided by the Woodruff Health Sciences Center Library at Emory University, through the Medical Heritage Library. The original may be consulted at the Woodruff Health Sciences Center Library, Emory University.
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![nal, (the termination of the lateral sinuses) alluded to in our view of the inner aspect of the bone. It fornis a part of the jugular fossa, and immediately behind it we observe a square eminence (the jugular process,]^ covered with cartilage in the recent state. A deeply serrated edge of about four and a half inches in extent follows, and meets a similar edge from the opposite side, at the superior part of the bone, forming sometimes an acute angle, at other times instead of an angle we have a notch, and in this case the most uniform of the Ossa Wormiana must have been present; this supernumerary bone has received a peculiar share of attention from the comparative anatomist. It is often named the epactal bone, and the cranium of the lower animals generally presents an additional bone in this situation, named an- terior occipital, or inter parietal. It is supposed that the epactal bone in man is a rudimentary structure in him. The occipital bone is perforated by five short ca- nals, whose orifices are named foramina, these are the magnum, and the two anterior and posterior condyloid. Its processes are seven in number, viz. two condyles, two jugular, two tuberosities, and a bazilar. Its os- teogeny is curious and very complex. At and for some years aftpr birth, simple macertion in water will sepa- rate the bone into four portions;—the bazilar, which it will be particularly remarked, supports a small por- tion of the condyles with about a fifth of the margin of the foramen magnum; two portions, including the re- mainder of the condyles, and about three-fifths of the circumference of the foramen magnum ; lastly, a large squamous portion, supporting somewhat less than a fifth of the foramen magnum. At an early period of the foetal existence, each of these portions are observed to be de- veloped from several centres. The foramen magnum is evidently analogous to the great vertebral foramen observed in all the vertebrae. The condyles seem to be analogous to the superior and inferior articular pro- cesses of two vertebrae; the squamous broad spinal por- tion is evidently highly developed laminae and spinous processes, whilst the bazilar in its intimate structure, form, and mode of connection with the sphenoid, pre- sents all the characters of the body of a vertebra. 48. The articulations of the occipital bone are the](https://iiif.wellcomecollection.org/image/b21037528_0039.jp2/full/800%2C/0/default.jpg)
