𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A scanning electron microscopic study of the developing epithelial scleral papillae in the eye of the embryonic chick

✍ Scribed by D. MacG. Fyfe; B. K. Hall

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
951 KB
Volume
167
Category
Article
ISSN
0362-2525

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Eyes of early embryonic chicks possess 14 scleral papillae, derived from the conjuctival epithelium and present as transient structures between seven and 11 days of incubation. These papillae induce the formation of the 14 scleral ossicles, which develop in the adjacent, neural crest‐derived ectomesenchyme. Each papilla undergoes a predictable series of developmental changes, divided by Murrary ('43) into six morphological stages (M stages 1–6). We have confirmed his staging, and provide a scanning electron microscopic (SEM) evaluation of papilla development. The earliest stage that can be visualized with the S.E.M. is M stage 2. We describe the initial modifications of the surface of papilla cells, the presence of large microvilli and the asymmetrical morphogenesis and growth of the papillae. Papillae are shed by a mechanism that involves elongation of the cells at the base of the papilla. Such moribund papillae consist of necrotic cells coated with fibers.

πŸ“œ SIMILAR VOLUMES

An analysis of the development of conjun
An analysis of the development of conjunctival papillae and scleral ossicles in the eye of the scaleless mutant,
✍ Palmoski, M. J. ;Goetinck, P. F. πŸ“‚ Article πŸ“… 1970 πŸ› John Wiley and Sons 🌐 English βš– 656 KB

## Abstract An analysis was carried out on the number and location of conjunctival papillae and scleral ossicles in chick embryos homozygous for the recessive gene scaleless. There are, on the average, three conjunctival papillae per eye in the mutant, while normal embryos have 14. The mutant is al

A scanning electron microscopy study of
A scanning electron microscopy study of the embryonic development of Pycnogonum litorale (Arthropoda, Pycnogonida)
✍ Jakob Machner; Gerhard Scholtz πŸ“‚ Article πŸ“… 2010 πŸ› John Wiley and Sons 🌐 English βš– 950 KB

## Abstract The phylogenetic position of the enigmatic Pycnogonida (sea spiders) is still controversial. This is in part due to a lack of detailed data about the morphology and ontogenesis of this, in many aspects, aberrant group. In particular, studies on the embryonic development of pycnogonids a