The of the three early developmental stages of Corvus corone sardinius disclosed that :-
1. The acrochordal cartilage as well as the parachordal plate have two separate centers of chondrification.
2. Lord sis is established in the chordal region and becomes less pronounced by the development of the neurocranium .
3. The acrochordal cartilage, the pila antotica and the posterior orbital cartilage have one center of chondrification.
4. The basal plate ends with the occipital condyle.
5. The first appearance of the prechordal region is represented by the deposition of five elements; a median single intertrabecula, two trabeculae cranii, paired polar cartilages, paired suprapolar cartilages and paired anterior orbital cartilages.
6. The auditory capsule originated from two separate centers of chondrification; the cochlear and canalicular portions.