![]() ![]() Amplexus sexual embrace of female amphibian by male, a process which may (frogs and toads) or may not (urodeles) occur at time of oviposition. Amphitene one end of chromosome is thick, one end is thin, moving toward full pachytene during maturation. Amphimixis mixing of germinal substances accomplished during fertilization. Amphiblastula double-structured blastula as in Porifera (sponges). Amitosis direct nuclear division without chromosomal rearrangements generally thought to be a sign of decadence or of high specialization, if it occurs at all. Albumen Sac 2-layered ectodermal sac enclosing albumen of chick egg during early development of embryo, separated for a time from yolk by vitelline membrane later to release some of its contents into amniotic cavity through ruptured sero-amniotic connection. Albumen protein substance secreted by walls of oviducts around egg of reptiles and birds. Albuginea of Testis stroma of primitive testis which forms a layer between germinal epithelium and seminiferous tubules. Aggregation coming together of cells, such as spermatozoa, without sticking a non-reversible response comparable to chemotropism. Agglutination cluster formation a spontaneously reversible reaction of spermatozoa to certain chemical situations (e.g., egg water). Aestivation reduced activity of some animals during heat of summer. Adnexa extra-embryonic structures (e.g., yolk sac) discarded before adult condition is attained. (Syn., perforatorium.) Activation process of initiating development in egg, normally achieved by spermatozoon of same species but also accomplished artificially (parthenogenesis) term also used to refer to stimulation of spermatozoon to accelerated activity by chemical (fertilizin) means. (See Basophil.) Acrosome apical organ at tip of mature spermatozoon, derived from spermatosphere (idiosome or centrosome) and presumably functional in aiding penetration of egg cortex by spermatozoon during fertilization. Historic Disclaimer - information about historic embryology pagesĪ supplementary list of some 350 specialized terms may be found in the author's "Experimental Embryology, a Manual of Techniques and Procedures," Minneapolis, Minn., Burgess Publishing Co., 1948.Ī Acidophil oxyphil: cell constituents which stain with acid dyes, often used to designate an entire cell type. (1951) The Blakiston Company.įrog Development (1951): 1 Introduction | 2 Rana pipiens | 3 Reproductive System | 4 Fertilization | 5 Cleavage | 6 Blastulation | 7 Gastrulation | 8 Neurulation | 9 Early Embryo Changes | 10 Later Embryo or Larva | 11 Ectodermal Derivatives | 12 Endodermal Derivatives | 13 Mesodermal Derivatives | 14 Summary of Organ Appearance | 15 Glossary | 16 Bibliography | Figures ![]() ![]() Book - The Frog Its Reproduction and Development. ייִדיש | Tiếng Việt These external translations are automated and may not be accurate. Google Translate - select your language from the list shown below (this will open a new external page) ![]()
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