64 



MAMMALIAN ANATOMY 



The dorsal aspect of the arch is smooth. The cephalic margin is 

 straight or slightly arcuate in the middle, and prolonged at each side 

 into the prominent cephalic articular process. The middle part of 

 the cephalic margin gives attachment to the rectus capitis posticus 



FIG. 38. 



Cephalic End, with Skuff. 



Transverse Process. 



Tubercle on 

 for 



LONGUS COLLI. 



OBLIQUUS CAPITIS SUPERIOR. 

 i RECTUS ANTICUS MINOR. 



RECTUS CAPITIS LATERALIS. 

 LEVATOR CLAV1CUL/E. 



THE ATLAS, VENTRAL ASPECT. 



minor muscle. At a point a couple of millimetres caudal to the ce- 

 phalic margin, at the median end of the cephalic articular process, 

 is a foramen which pierces the bone transversely. A well-marked 

 groove is continued laterally and ventrally from this foramen on the 

 arch and cephalic to the cephalic edge of the transverse process. It 

 then passes toward the tail, and medially on the ventral aspect of the 

 root of the transverse process to the cephalic opening of the arterial 



FIG. 39. 



RECTUS POSTICUS MINOR on Front of Neural Arch. 



Cephalic Articular Process. 



Foramenfor Vessels L 



Transverse Process. 



OBLIQUUS INFERIOR. 



Cephalic Articular Surface. 



THE ATLAS, DORSAL ASPECT. 



canal. The vertebral arterv, after traversins; the arterial canal in the 



.' ' O 



transverse process, is lodged in this groove, and enters, through tins 

 dorsal foramen, the neural canal, whence it is continued into the cranial 

 cavity of the skull. The foramen also gives exit to the first spinal 



