323 THE HORSE. 
is attached tc the corresponding surfaces of the second vertebra, and still 
more externally are the ale or wings. ‘The superior and inferior spinous 
processes are shown at 1 and 4 in each engraving. 
THE SECOND CERVICAL VERTEBRA, Called aats from its being the centre 
on which the atlas turns, and dentata, from its presenting a tooth-like 
process for this purpose, approximates somewhat more nearly to the usual 
type, but is remarkable for the process already alluded to, which is shown 
at (4, Fig. 15). Inferiorly this part is smoothly rounded, to enable it to 
play against the first vertebra, while superiorly it is flatter, and is in 
apposition with the transverse ligament. ‘The four articular processes are 
Wig. 15.—ANTERIOR VIEW OF THE SECOND VERTEBRA, CALLED DENTATA OR AXIS. 
1. Superior spine. 5. Inferior spine. 
2. 2. Transverse processes. 6. Spiral foramen. 
3. 3. Surfaces articulating with corresponding 7. 7. Foramina for the passage of the vertebra) 
ones on the posterior part of the atlas. arteries. 
4. Odontoid process. 
shown at (3,3, Fig. 15) and (5,5, Fig. 16). The lateral processes are well 
shown at (2, 2) in both engravings, and the posterior oblique processes at 
(5,5, Fig. 16). In this latter engraving at (4), the large hollow cavity 
glenoid) is shown, by which the body of this vertebra unites with the 
head of the third. 
Tia. 16.—PosTeriok View OF SECOND CERVICAL VERTEBRA. 
1. Spinal foramen. 4. Glenoid cavity articulating with the head of 
2. 2. Transverse processes. 2 third cervical vertebra. 
8. 3. Posterior view of the anterior articular 5. 5. Posterior oblique processes. 
surfaces, 6 Inferior spine. 
