Manual of general, descriptive, and pathological anatomy (Volume 2).

  • Meckel, J. F. (Johann Friedrich), 1781-1833.
Date:
1832
Catalogue details

Licence: Public Domain Mark

Credit: Manual of general, descriptive, and pathological anatomy (Volume 2). Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    I. ANTERIOR OCCIPITO-ATLOIDAL MEMBRANE. § 847. The anterior occipilo-atloidal ligament (membrana annuli anterioris atlantis) is, in fact, only the summit of the anterior vertebral ligament, and extends from the anterior arch of the atlas to the anterior edge of the large occipital foramen. It is formed of perpendicular fibres, of which those in the centre are stronger, and form a distinct and projecting fasciculus, which is continuous with the central and pro- minent portion of the anterior vertebral ligament (§821), and is attached to the centre of the basilar process of the occipital bone. II. POSTERIOR OCCIPITO-ATLOIDAL MEMBRANE. § 848. The posterior occipito-atloidal membrane (membrana annuli posterioris atlantis) is situated between the posterior extremities of the two articular ligaments, and extends from the upper edge of the posterior arch to the posterior part of the circumference of the occipital foramen, and fills the posterior space between the two bones. It is thinner and weaker than the anterior, and does not form a continuous membrane, as that does. ' III. ARTICULAR LIGAMENTS. § 849. The. articular processes of the occipital bone and of the atlas are united, like the articular surfaces of the transverse processes, by a complete capsular ligament (Lig. articulationum capitis cum atlante, Lig. articulare superius), which arises from the circumference of their contiguous surfaces. It differs from the others in being broader and looser, so that it allows more extensive motions. . IV. ACCESSORY LIGAMENTS. § 850. The accessory ligaments (Lig. accessoria) are fibrous bands, which proceed obliquely from above do wn ward, and from without inward, from the summit and from the upper edge of the transverse processes of the atlas, and are attached partly to the capsule and partly to the occipito-atloidal membranes, and around the occipital foramen. They strengthen the ligaments already described, and furnish points of attachment to the small deep muscles of the head. H. LIGAMENTS BETWEEN THE BASILAR BONE AND THE AXIS. § 851. The union between the head and the axis by means of the basilar bone is much firmer and stronger than that between the head and the atlas. It is formed by very dense bands of longitudinal fibres, which extend from the edges of the occipital foramen to the centre of the axis. There are no capsular ligaments in this articulation.