DISSECTION OF THE HEAD AND NECK 



287 



(ac) Joint-capsules (capsulae articulares) . 



(ad) Intertransverse ligaments (ligamenta intertransversaria) . 



(ae) Interspinous ligaments (ligamenta interspinalia) . 



(af) Supraspinous ligament (ligamentum supraspinale) . Here 



called the ligamentum nuchae. 



(ag) Anterior longitudinal ligament (Lig. longitudinale anterius) 



(0. T. anterior common ligament). 



(ah) Posterior longitudinal ligament (Lig. longitudinale posterius) 

 (0. T. posterior common ligament). 



(b) Joint between atlas and occipital bone (articulatio atlanto-o'ccipitalis) . 



What kind of joint is it? Study 



(ba) Joint-capsules (capsulae articulares). 



(bb) Anterior atlanto-occipital membrane (membrana atlanto- 



occipitalis anterior). 



(be) Posterior atlanto-occipital membrane (membrana atlanto- 

 occipitalis posterior). 



(c) Joint between atlas and epistropheus or axis (articulatio atlanto- 



epistrophica) . 

 (ca) Joint-capsules (capsulae articulares). 



FIG. 124. 



Pars basilaris ossis occipitalis 



| 



. cruciatum atlantis 

 Lig. alare. 



f 



Lig. transversum atlantis 



Lig. cruciatum atlantis 



Lig. cruciatum atlantis posterior view. (From Poirier et Charpy, Traittf d'Anat. 

 hum., Paris, 1899, 2 ed., t. i. p. 818, Fig. 802.) 



Before studying further, cut away the posterior arches of the atlas and 

 epistropheus with heavy bone-forceps. With a saw, cut through the 

 occipital bone on each side from a point behind the processus jugularis 

 and the condylus occipitalis into the foramen magnum, so that the whole 

 squama occipitalis may be removed. Remove the dura mater and study 

 the following: 



(cb) Tectorial membrane ("roof-membrane") (membrana tecto- 

 ria) (0. T. posterior occipito-axial ligament). 



