Ligaments of the Spine. 



Os occipitis 



78. The Posterior Obturator Membrane, 

 Membrana obturator ia posterior. 



The space between the posterior arch of the atlas and the posterior 

 border of the Foramen occipital?, maynum is closed by the Menribrafna obturatorla 

 pouter tor ; this membrane is weaker than the anterior obturator membrane, 

 and is perforated on both sides at its outer border by the Arteria vertebralis, 

 which fills out the space shown in the figure , runnig upwards from 

 the Foramen transversarium of the atlas to the Foramen oecipitale manmun. 



