By Marise Heyns
This quantity is a important contribution to the impact of a teratological agent on early avian improvement, particularly the chondrocranium. Cranial abnormalities constructing from the experimental program of ethyl alcohol on genetically and nutritionally uniform chick embryos are defined intimately and in comparison to the conventional phases of improvement. a whole dialogue and overview are supplied in regards to the gross abnormalities and malformations saw in microscopical and histological investigations. the price of avian fabric for the experimental applicaion of teratogenic fabric is demonstrated.
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Extra resources for The Influence of Ethyl Alcohol on the Development of the Chondrocranium of Gallus gallus
Anteriorly the atrioturbinal is a ventrolaterally directed ridge of the parietotectal cartilage (Fig. l3B), while more posteriorly, the maxilloturbinal is represented by a medially directed ridge of the sidewall (Fig. l3C). There is a gradual dorsoventral decrease in the degree of chondrification in the walls of the nasal capsule, terminating in mesenchymatous edges for the turbinals. The anterior portion of the procartilaginous ridge along the lateral side of the base of the posterior nasal region has chondrified and the chondrification diminishes posteriorly from the level of the anterior end of the maxilloturbinal to the posterior end of the nasal septum.
29D). Atrophy has commenced beneath the fenestra craniofacialis. This would result in the craniofacial notch in this position. Two vomerine cartilages have developed in the region behind the planum antorbitale (Fig. 30A). \--:>ol:::::-~~t:9 nasal capsule Base of nasal septum Glandula maxillaris C o Planum antorbltale I I E Parietotectal cart il age F Fig. 28. Stage VI. Series of anteroposterior transverse sections through the nasal capsule. Scale bar = 1 mm. :'*"iol--- Concha nasalis Planum antorbltale Vomerine cartilage I-------i Fig.
Stage VI. Reconstruction of columella auris (norma dorsalis). Scale bar =I mm. 1 Stage I Incubation period: 5 days In contrast to the results of Vorster (1989), most of the embryos in this age group (Table 3) contain neither chondrifications nor mesenchymatous anlagen of the chondrocranium. Only in one embryo (no. 3; see Table 3), the anlagen of the chondrocranium appear in the form of mesenchymatous condensations without any sign of intercellular deposit. In this embryo only the slightest condensation of mesenchyme could be discerned in the region of the basal plate and otic capsules.