Treasury of human inheritance . Z 4 = a _ J . a. - ?> a. 5 ?- 1) c E-iI—IP3 t—I !?;<^ O. - 3= SO = -3si ^ ^ a ?^ Plates VI., VII. LEWIS: BRACHYDACTYLISM 15 frequently, though wrongly, termed hypophalangia. The essential feature of thedeformity seems to lie in an incomplete development of the middle phalanx of all fourpost-axial digits on hands and feet; the phalanx is repiesented hy a sliortened andmalformed bone which is more or less welded into the base of the terminal phalanx(Hasselwander), or is altogether unrepresented. Associated with the defect are seenalterations in the length
Treasury of human inheritance . Z 4 = a _ J . a. - ?> a. 5 ?- 1) c E-iI—IP3 t—I !?;<^ O. - 3= SO = -3si ^ ^ a ?^ Plates VI., VII. LEWIS: BRACHYDACTYLISM 15 frequently, though wrongly, termed hypophalangia. The essential feature of thedeformity seems to lie in an incomplete development of the middle phalanx of all fourpost-axial digits on hands and feet; the phalanx is repiesented hy a sliortened andmalformed bone which is more or less welded into the base of the terminal phalanx(Hasselwander), or is altogether unrepresented. Associated with the defect are seenalterations in the lengths of the bones of digit 1 (shortening or lengthening, etc.), andin some instances shortening of the long bones of the limbs, with resultant deficiencyof stature. The deformity tends to be remarkably symmetrical and hereditarytransmission appears to be the rule. The outward conformation of the extremities isnecessarily altered, the lines of the skin are changed, the gi-ip and manipulative powersuffer. There appears to be an interesting relationsbip between the mode in whichshortening take
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