Anatomy and Embryology

, Volume 193, Issue 5, pp 505–513

Chondroid tissue in the early facial morphogenesis of the chick embryo

  • B. Lengelé
  • J. Schowing
  • A. Dhem
Original Article

DOI: 10.1007/BF00185882

Cite this article as:
Lengelé, B., Schowing, J. & Dhem, A. Anat Embryol (1996) 193: 505. doi:10.1007/BF00185882

Abstract

The calcified tissues involved in the early morphogenesis of the so-called intramembranous bones of the facial skeleton were studied by microradiographic and histological techniques in 22 chick embryos at the 9th, 12th and 14 th days of incubation. On the 9th day, the bones of the upper face and palatal vault are made up of thin sheets of chondroid tissue, deposited in their respective mesenchymal condensations. Woven and lamellar bone formation subsequently takes place in each of them from the 12th day of incubation, mainly on the external side of their chondroid primordia. The same phenomena occur in the lower facial and mandibular bones. These facts indicate that the primitive facial desmocranium of the chick embryo, which is classically considered to be formed by intramembranous ossification, first consists of chondroid tissue. As in the cranial vault, this tissue thus represents the initial modality of the skeletogenic differentiation within the avian facial mesenchyme.

Key words

Chondroid tissueFacial bonesIntramembranous ossificationMicroradiograph

Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • B. Lengelé
    • 1
  • J. Schowing
    • 2
  • A. Dhem
    • 1
  1. 1.Human Anatomy Research Unit, Faculty of Medicine, University of LouvainBrusselsBelgium
  2. 2.Institute of Zoology, Department of Embryology and Experimental TeratologyUniversity of FribourgFribourgSwitzerland
  3. 3.Unité d'Anatomie HumaineBruxellesBelgium