The development of the chondrocranium
of the snake, Malpolon monspessulana.
In addition, the chondrocranium of Mabuya is compared with the species of the old world Trachylepis capensis and Eutropis carinata, therefore, these morphological studies could provide additional anatomical characters to support the taxonomic status of this American clade as monophyletic.
1): In this stage, elements of three regions of the chondrocranium are observed: the anterior ethmoidal region, the intermediate orbitotemporal region, and the posterior occipital region (Table 1).
Differences with Mabuya macrorhyncha: in this stage the cartilages of ethmoidal and orbitotemporal regions are not clearly observed in the chondrocranium. However, the trabecula communis, the basal plate, the otic capsule and the occipital arch are totally visible (Table 1).
2): In this stage the chondrocranium presents further development in orbitotemporal and occipital regions (Table 1).
This work was conducted to study the postnatal progression of suture and synchondrosal closure and to illustrate normal development and progression in the chondrocranium suture lines throughout the first 18 years of life using 3 mm axial CT cuts with bone definition algorithm .
In conclusion, the obtained data should be of assistance to radiologists in the diagnosis of fractures, skeletal dysplasia, and deformities that affect the pediatric chondrocranium. It can also help surgical approaches to the pediatric cranial base, allowing safe implementation while developmental anatomic relationships are considered.
Suture closure in the human chondrocranium: CT assessment.
This primitive arrangement of chondrocranium and gill arches forms the basis of the skull in all jawed vertebrates.
The palatoquadrate has three attachments to the chondrocranium. One attachment is located anterior to the chondrocranium at the anterior trabeculae, another attachment is at the polar bodies, and the third is a posterior attachment at the otic capsule (containing the inner ear).
In the autostylic architecture, the palatoquadrate is essentially fused to the chondrocranium. This is the type of jaw suspension seen in most present-day tetrapods (figure 2).
Developed in the dermis and capable of bearing rooted teeth, dermal bone was laid down over the entire original chondrocranium on the undersurface of the palatoquadrate and the anterior portion of Meckel's cartilage.