OSTEOLOGY. 11 



The posterior lorder forms with the occipital bone the 

 lambdoid suture. 



Of the angles the anterior inferior is the only important one, 

 being longer and grooved internally by the middle meningeal 

 artery. 



It articulates with five bones frontal, sphenoid, temporal, 

 occipital, and opposite parietal bones. 



It has but one muscle attached the temporal. 



It is developed from an ossific centre. 



THE OCCIPITAL forms the posterior inferior portion of the 

 cranium. It presents two surfaces, four angles, and four bor- 

 ders. 



Fio. 5. 



2, occipital protuberance; 3, crest; 4, inferior curved line; 5, fora- 

 men magnum; 6, condyle; 7, posterior condyloid foramen; 8, an- 

 terior condyloid foramen; 9, jugular process; 11, basilar process; 12, 

 tubercles for check ligaments. 



The external and posterior surface is irregularly convex, and 

 presents 



The occipital protuberance (also called external to dis- 

 tinguish it), for insertion of ligamentum nuchae, descending 

 from which to the foramen magnum is 



The occipital crest, for tendinous attachment, and diverg- 

 ing on either side, above and below, are 



The superior curved line, for attachment of occipito fron- 

 talis, trapezius, and other muscles; and 



The inferior curved line for attachment of rectus capitis 

 posticus, major and minor. 



Anteriorly it presents a large aperture, 



