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Fig. 4. X-ray photographs of the pig's manus

Showing normal structure and reversionary polydactylism.

A, bones of normal manus;

B, manus in which the pollex is represented by two phalanges and the distal end of the metacarpal bone (I.);

C, manus with pollex completely developed; trz., trapezium.

fig 1 | fig 2 | fig 3 | fig 4 | fig 5 | fig 6 | fig 7

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)


Prentiss CW. Extra digits and digital reductions. (1906) Popular Science Monthly. 336-448.

Cite this page: Hill, M.A. (2024, February 22) Embryology Prentiss1906 fig04.jpg. Retrieved from

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