72 



HUMAN ANATOMY. 



Name. 

 VERTEBRA. 



Atlas (3). 

 Axis (6). 



Seventh Cervical. 



Lumbar Verte- 

 brae (2). 



Sacrum (35). 

 15. 



10. 



C. 

 4. 



Coccyx (7). 



CRANIAL 

 BONES. 



Occipital (7). 



Parietal (1). 



TABLE OF OSSIFICATION. 



Centres. 



3 Primary: 



1 for each lamina. 

 1 for each process. 

 1 for body. 



4 Secondary Centres : 



1 for each transverse process. 



2 for end of spinous process. 

 2 Additional Plates: 



1 epiphyseal plate on upper and 

 under surface of body. 



1 for each lateral mass. 



1 epiphysis for anterior arch. 



1 for lower part of body. 



1 for each lamina. 



2 for lateral processes. 



1 for apex of odontoid process. 

 1 for anterior and costal part of 

 transverse process. 



1 for each tubercle of superior 

 articular process. 



3 1 for each body 



and upper and lower epiphys- 

 eal plate. 



2 1 for each arch. 



2 for each lateral mass of the first 

 three vertebrae. 



Each lateral surface has one epi- 

 physeal articulation and ad- 

 joining edge. 



1 for each piece. 



2. 

 3. 

 4. 



Time of 

 Appearance. 



Gth week. 

 8th week. 

 16th year. 



21st year. 



All unite by 30th 



year, 



8th week. 

 1st year. 

 Gth month. 



6th foetal month. 



Gth f octal month ; 

 joins 5th or Gth 



year. 



8th or 9th week. 

 16th year, and 



unites 18th or 



20th year. 

 Gth or 8th month; 



joins 2d to Gth 



year. 



18th to 25th year. 



Birth. 



5th to 10th year. 

 10th to 15th year. 

 15th to 20th year. 



4 for tabular or epi-occipital. 

 1 for each condylar portion. 



8th foetal week. 

 4th to 6th year; 

 joined to sphe- 

 noid 18th to 

 25th year. 



1 for basilar portion. 

 From membrane. 



Single centre at parietal eminence. 7th to 8th foetal 



week. 



