Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 67American Philosophical Society, 1928 |
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Сторінка 158
... cusps . There are five of them in the human lower first molar , three on the outer side and two on the inner side . The the " Dryopithe- A cusp terminology was worked out by Pro- cus Pattern " fessor Osborn in 1888. These terms name each ...
... cusps . There are five of them in the human lower first molar , three on the outer side and two on the inner side . The the " Dryopithe- A cusp terminology was worked out by Pro- cus Pattern " fessor Osborn in 1888. These terms name each ...
Сторінка 159
... cusps , begins in a transverse depression in front of the cusps 1 and 2 , called fovea anterior , and ends in a depression behind cusp 4 , called fovea posterior . The shorter transverse grooves , two on the outer side and one on the ...
... cusps , begins in a transverse depression in front of the cusps 1 and 2 , called fovea anterior , and ends in a depression behind cusp 4 , called fovea posterior . The shorter transverse grooves , two on the outer side and one on the ...
Сторінка 161
... cusp 3 , the bases of the crests of cusps I and 4 remaining separated . This whole pattern of five main cusps , the longitudinal groove with its terminal depressions , the fovea anterior and posterior , and the Y - shaped system of ...
... cusp 3 , the bases of the crests of cusps I and 4 remaining separated . This whole pattern of five main cusps , the longitudinal groove with its terminal depressions , the fovea anterior and posterior , and the Y - shaped system of ...
Сторінка 162
... cusps and system of grooves are changed . The cusps are reduced from 5 to 4 and the groove system is changed from the Y to the cross . There is another change occurring in which the cusp number is reduced but the primitive system of ...
... cusps and system of grooves are changed . The cusps are reduced from 5 to 4 and the groove system is changed from the Y to the cross . There is another change occurring in which the cusp number is reduced but the primitive system of ...
Сторінка 163
... cusp number is increased . In this change certain cusps are added on to those already present . Thus in Fig . 6 , representing the lower teeth of an American Indian , there is an extra cusp present . This cusp is denoted by the number 6 ...
... cusp number is increased . In this change certain cusps are added on to those already present . Thus in Fig . 6 , representing the lower teeth of an American Indian , there is an extra cusp present . This cusp is denoted by the number 6 ...
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