418 



between the costal processes of the first, second and third sacral verte- 

 brae, two distinct epiphyses appear, the uppermost pair belong to the 

 costal process of the first sacral vertebra and the lowermost to the 

 costal process of the second sacral vertebra, and they are labelled 

 (Ä. G. i, P. C. 2 and A. C. 2 and P. C. 2). But in the gaps between the 

 third and fourth, fourth and fifth vertebrae only one epiphysis is de- 



PC, 



RCVL 



A.C.i^ 



Fig. 3. 



Fig. 4. 



Fig. 3. Tlie Sacrum viewed from the right side. A. C. 1 Anterior costal epiphysis 

 of 1st sacral vertebra. P. C. 1 Posterior costal epiphysis of 1st sacral vertebra. A. C. 2 

 Anterior costal epiphysis of 2nd sacral vertebra. P. C. 2 Posterior costal epiphysis of 

 2nd sacral vertebra. A. C. S Costal epiphysis of 3rd sacral vertebra. A. C. 4 Costal 

 epiphysis of 4th sacral vertebra. T. 1 Epiphysis of Transvei-se process of 1st sacral 

 vertebra. T. S Epiphysis of Transverse process of 3rd sacral vertebra. T. 4 Epiphysis 

 of Transverse process of 4th sacral vertebra. T. 5 Epiphysis of Transverse process of 

 5th sacral vertebra. In this Figure the component elements of the tuberosity are shown 

 separately. 



Fig. 4. The Sacrum from the left side. The components of the tuberosity have 

 partially united. Notice the commencement of an upward extension from the function of 

 T. 5 and A. C. 4 towards A. C. S. The lettering is the same as in Fig. 3. 



veloped, and these are in series with A. C. 1 and A. C. 2. They are 

 therefore labelled {A. G. 3 and A. G. 4) : 



View from behind (Fig. 5). All the above mentioned epiphyses 

 are visible from behind and in their relative position to one another. 

 But other centres are also visible and these centres are in series 

 with the transverse processes of the sacrum. 



Epiphyses of the transverse processes: 



In Fig. Ö (T. 1) one can see at the tip of the transverse process 

 of the first sacral vertebra an epiphysis which is in process of exten- 

 sion downwards to the auricular facet, no such epiphysis is visible on 



