Volume 180501

Anatomia Britannica; a system of anatomy and physiology, selected from the works of Haller, Albinus, Monro, etc.

Date:
1805
Catalogue details

Licence: Public Domain Mark

Credit: Anatomia Britannica; a system of anatomy and physiology, selected from the works of Haller, Albinus, Monro, etc. Source: Wellcome Collection.

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    nect this vertebra to the os occipitis, and to the second vertebray are fixed. ‘The back part of the arch is concave, smooth, and | covered witha cartilage, in a recent subject, to receive the tooth- zi In a first vertebra, from which the second has. been separated, this hollow re the passage for the spinal marrow to seem much larger than it | like process’ of the second vertebra. really is: on each side of it a small rough sinuosity may be | remarked, where the ligaments going to the sides of the tooth- | like process of the following vertebra are fastened ; and on each ‘) side a small rough protuberance and depression is observable, | where the transverse ligament, which secures the tooth-like i process in the sinuosity, is fixed, and hinders that process from | injuring the medulla spinalis in the sections of the head. ] The atlas has as little spinal process as body; but, instead | thereof, there is a large bony arch, that the muscles which / pass over this vertebra at that place might not be hurt in ex-_ tending the head. On the back and upper part of this arch | there are two depressions, where the recti postici minores take | their rise ; and at the lower part are two other sinuosities, into | | which the ligaments which connect this bone to the following one are fixed. The superior oblique processes of this atlas are large, oblong, hollow, and more horizontal than in any other vertebra. They I rise more in their external than internal brim ; by which their | articulations with the condyloid processes of the os occipitis are | firmer. Under the external edge of each of these oblique | processes is the fossa, or deep open channel, in which the ver- | tebral arteries make the circular turn, as they are about to enter | the great foramen of the occipital bone, and where the tenth _ pair of nerves go out. This fossa is sometimes covered with f borie, the inferior oblique processes, extending from within | outward and downward, are large, concave, and circular. So that'this vertebra, contrary to the other six, receives the bones with which it is articulated both above and below. 3 Thetransverse processes here are not much hollowed or forked ; but are longer and larger than those of any other vertebra of the neck, for the origin and insertion of several muscles; of which — those that serve to move this vertebra on the second have a con- ] e }