478 



MAMMALIAN ANATOMY 



to describe them. The only sutures seen on this surface are the two 

 occipito-mastoid sutures situated near the lateral angles. Each 

 suture begins below in the cleft between the paroccipital process 

 and the mastoid process ; thence it runs almost vertically to meet 

 the lambdoidal crest, which it intersects half-way up, and ends at the 

 asterion. 



At the lower margin is the median foramen magnum, flanked by 

 the occipital condyles. It is the only foramen visible upon this 

 surface. The posterior surface affords attachment to many important 

 muscles, as follows : At the lower margin, on the .paroccipital process, 

 the digastric ; on the mastoid, the stylo-glossus and the cleido- 

 mastoid ; on the external surface of the mastoid, the rectus capitis 

 lateralis ; and in the deep pit above the paroccipital process and up 

 to the lambdoidal ridge, the obliquus capitis superior ; on the ridge 







FIG. 389. 



RHOMBOIDEUS CAPITIS. 



CEPHALO-HUMERAL. SPLENIUS. BIVENTER CERVICIS 



, RECTUS CAPITIS POSTICUS MAJOR. 



-RECTUS CAPITIS POSTICUS MINOR. 



Frontal. 



Parietal. 



COMPLEXUS. 



STERNO-MASTOID 



SPLENIUS. .,- 

 RECTUS CAPITIS LATERALIS. 



CLEIDO-MASTOID. 



Foramen Magn 

 Occipital Condyle, 



'.lamous of Temporal. 

 Postorbital Processes. 



Zygomatic Process of 

 Temporal. 



STYLOGLOSSUS. ~ f ^ 



Mastoid of Temporal 



ji&t ~**s^^&3eai^^' 



\ with Atlas. 



DIGASTRIC. OBLIQUUS CAPITIS Paroccipital or Jugular Process. ' Auditory Bulla. 



SUPERIOR. 



THE SKULL, POSTERIOR OR OCCIPITAL ASPECT. 



above, from the middle line outwardly, the cephalo-humeral and the 

 sterno-mastoid ; below them, the rhomboideus capitis and the sple- 

 nius ; below these, again, the biventer cervicis and the complexus ; 

 beneath the biventer, the rectus capitis posticus major ; and beneath 

 that, but still confined to the superior third of the supra-occipital, is 



