Early prenatal attainment of adult metacarpal-phalangeal rankings and proportions

Early prenatal attainment of adult metacarpal-phalangeal rankings and proportions

As shown in 56 human embryos and fetuses between 15 and 104 mm in crown-rump length, "adult" metacarpal-phalangeal length rankings are attained by the seventh intrauterine week and near-adult bone-to-bone ratios or proportions by the theirteenth week. Micrometric measurements of optically-...

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Bibliographic Details
Published in:American journal of physical anthropology Vol. 43; no. 3; p. 327
Main Authors: Garn, S M, Burdi, A R, Babler, W J, Stinson, S
Format: Journal Article
Language:English
Published: United States 01-11-1975
Subjects:
Anthropology, Physical
Fingers - embryology
Humans
Metacarpus - embryology
Osteogenesis
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Summary:As shown in 56 human embryos and fetuses between 15 and 104 mm in crown-rump length, "adult" metacarpal-phalangeal length rankings are attained by the seventh intrauterine week and near-adult bone-to-bone ratios or proportions by the theirteenth week. Micrometric measurements of optically-projected histological hand sections show relative elongation of the distals between the 15-29 mm and 30-44 mm crown-rump range, and relative reduction to radiogrammetrically-determined adult proportions by the 90-104 mm CRL.
ISSN:0002-9483
DOI:10.1002/ajpa.1330430305