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Avian scale development. Absence of an “epidermal placode” in reticulate scale morphogenesis

✍ Scribed by R. H. Sawyer; K. F. Craig

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 714 KB
Volume: 154
Category: Article
ISSN: 0362-2525
DOI: 10.1002/jmor.1051540106

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✦ Synopsis

Abstract

Timed‐sequence studies have shown that reticulate scales on the ventral footpads of birds do not undergo “epidermal placode” formation during their morphogenesis, but arise as symmetrical evaluations similar to the scales of snakes and lizards. Unlike the scutellate scales on the dorsal surface of the foot, in which the formation of an “epidermal placode” and its subsequent morphogenesis result in distinct outer and inner epidermal surfaces, the reticulate scales elaborate only one type of epidermal surface.

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Avian scale development. VII. Normal ker

Avian scale development. VII. Normal keratinization follows abnormal morphogenesis of reticulate scales from the “scaleless” mutant

✍ Roger H. Sawyer; Thomas K. Borg 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 682 KB

## Abstract The scutate scales are entirely missing in chick embryos homozygous for the gene, “scaleless.” Reticulate scales of this mutant are present; however, they have undergone abnormal morphogenesis into irregular mounds and crevices. The pattern of keratinization seen along the anterior meta