The effects of experimental unilateral anotia on skull development in the chick embryo. IV. Development of the bony skull in embryos of 9-20 days of incubation.
The study of the development of the bony skull in chick embryos with unilateral (right-sided) anotia revealed the following characteristics: 1. The perichondral bones initially follow exactly the cartilaginous structures to which they are related. Later, they may expand desmally to fill up the gaps and diminish the degree of pre-existing asymmetry. 2. The desmal bones which develop in close contact with cartilage, develop parallel to its margins and, hence, appear to be greatly dependent on the chondrocranium. 3. Among the desmal bones which arise independently from cartilage, only the bones of the cranial vault proved to be influenced by the unilaterally anotic condition.
D000818:Animals; D001846:Bone Development; D002356:Cartilage / Q000196:embryology; D002642:Chick Embryo; D007758:Ear, Inner / Q000601:surgery*; D012886:Skull / Q000196:embryology*