AND rilYSIOLOGY. 



41 



Fig. 41. Fig. 42. 



A Dorsal Vertebra. 1, The Body. 2 and The Sacrum. 1 and 2, Articular sur- 

 7, Faces for head and tubercle of Rib. 3, faces. 3, Promontory of the Sacrum. 4 

 Upper face of the body. 4 and 5, Interver- and 10, Lines of former division of Sa- 

 tebral Notch. 6. Spinous process. 8 and crum. 5 and 6, Foramina. 7, Sacro Ischia- 

 ls Oblique processes. tic Notch. 8, Alae of the Sacrum. 9, Ob- 



lique processes. 



100. Lumbar Vertebra. — The vertebrae of the Loins, or 

 the Lumbar, are five in number, and are the largest members 

 of the spinal column, since they are the only bones in this 

 part of the body. They are more massive and solid in all 

 their parts than the rest of this column, that they may be 

 equal to the strength required of them. 



101. Sacrum. — The Sacrum is a single bone, although 

 its typical form is that of five vertebrae, which are actually 

 found in some animals. Its appearance is that of five verte- 

 brae, which are partially anchylosed or grown together. The 

 form of the bone is somewhat like a wedge, with the base 

 directed upwards, and the point curving inwards and for- 

 wards. Fig. 43. 



102. Coccyx. — The Coccyx is the lower 

 extremity of the Spinal Column, formed 

 of four anchylosed and imperfect verte- 

 brae ; and it is an extension of these bones 



in the monkey which makes the tail. The coccyx, i, First bone. 



2, 3, Processes to join the 

 Sacrum. 4 and 5, Notches to form Foramen. 6, Last bone. 



100. How many Lumbar Vertebrae? Why are they the largest in size ? 101. Describe the 

 Sacrum. How many rudimentary vertebraa does it consist of? 102. Describe the Coccyx. 



