OSTEOLOGY. 



75 



Name. 

 Metacarpus (2). 



Phalanges (2). 



LOWER 

 EXTREMITY. 



Os Innominata 

 (8). 



Femur (5) 



Patella. 

 Tibia (3). 



Fibula (3). 



Centres. 



Centres for each: 



1 for shaft and 



1 for each distal extremity ex- 

 cept thumb, which has one 

 each for shaft and base. 



1 for each shaft and base. 



3 Primary: 

 Ilium. 



Ischium. 

 Pubes. 



5 Secondary: 

 1 crest of ilium. 

 1 anterior inferior spinous proc- 

 ess. 



1 tuber ischii. 

 1 symphysis pubis. 

 1 acetabulum. 



1 for shaft. 

 1 for upper extremity. 

 1 for lower extremity. 

 1 for great trochanter. 

 1 for lesser trochanter. 



Single centre. 



1 for shaft. 



1 upper extremity. 



1 lower extremity. 



1 for shaft. 



1 upper extremity. 



1 lower extremity. 



Time of 

 Appearance. 



8th or 9th week. 

 3d year, and 



unites about 



20th year. 



8th week, and 

 unites 18th to 

 20th year. 



Same as verte- 

 brae, 6th week. 

 3d month. 

 4th or 5th month. 



Puberty. 



13th or 14th year; 

 completed 25th 

 year. 



5th week. 



End of 1st year. 



9th foetal month. 



4th year. 



13th or 14th year. 



Inferior extrem- 

 ity. The last 

 is not united 

 before the 20th 

 year. 



3d to Gth year; 

 completed 

 about puberty. 



7th week. 

 Birth; unites 



20th year. 

 2d year; unites 



18th year. 



8th foetal week. 



4th year. 



2d year; the 

 lower unites 

 first about 

 20th year. 



