Although cranial base develops majorly from chondrocranium
, it shows both neural growth, from sella upto foramen caecum, and somatic pattern of growth type.
(1973a, b), study the developmental of chondrocranium of Malpolon monspessulanus ponting to the columella auris organization.
The early development of the chondrocranium of the lizard.
However, in the 36 hpf embryos, there was weaker expression in the notochord for surface embryos and an increased expression in the chondrocranium
. At 3 days post-fertilization (dpf), cave and surface embryos showed similar expression in the chondrocranium
Regarding African species, Skinner (1973) described the ontogenetic and adult morphology in Trachylepis capensis skull, whereas Rao & Ramaswami (1952) described the fully formed chondrocranium
and the adult osteocranium of the Asian Eutropis carinata.
It is named chondrocranium
since most of its bones are made up of cartilage and ossify by the process of endochondral ossification .
He distinguished it from the other genera in the family Scyliorhinidae by the presence of a supraorbital crest on the chondrocranium
and the lack of upper and lower labial furrows.
, teeth and patches of skin 20 Long Inlet, Graham 53[degrees]12'N, 16 Dec.
What we call the skull in humans was formed from a combination of the primitive brain case (chondrocranium
), the sensory capsules and their underlying supports, components of the visceral skeleton (gill arches and their derivatives), and the overlying dermal bones (dermatocranium).
However, systematic deposits of calcium phosphate have also been found in chondrocranium
, jaws, visceral arches, fin cartilage, claspers, neural and haemal arches (Clement, 1992).
Decomposition of beached carcasses is accompanied by erosion of the caudal fin and sloughing of the head, leaving a long bony "tail" and a small chondrocranium
"head" (Scott and Scott, 1988).
of the embryo was evidently damaged and foreshortened by the general compression of its snout.