1. The lord sis phenomenon, which is found in early stages, becomes more minimized at the present stage.
2. The complete formation of the basicranial fenestra takes place by the reabsorption process of the cartilage at the top of the basal plate.
3. The type of the tectum synoticum is tectum posterius which is purely occipital in origin.
4. The ordinary three hypoglossal foramina exist at the lateral edge of the basal plate.
5. There are seven prominentiae which characterize the avian auditory capsule.
6. The formation of the fenestra ovalis takes place by the degeneration process of the pre – existing cartilage of the internal wall of the prominentia cochlearis.
7. The auditory capsule is connected by a number of commissures which provide a firm position.
8. There are three pores represent the division of the fissure metotica which are aperture medialis recessus scalae tympani, foramen jugulare and fissura exoccipitocapsularis.
9. The growing backwards of the parietotectal cartilage persists for a very long distance, reaching to the auditory capsule for a considerable distance.
10. The interorbital septum attains a huge height. It persists for a long distance and reaches the anterior third of the auditory capsule.
11. The fenestra septi interorbitalis is completed by the reabsorption of pre – existing cartilage in the central part of the interorbital septum.
12. The severe regression process affects the posterior orbital cartilage and the acrochordal cartilage.
13. There is a complete disappearance of the anterior orbital cartilage including the planum suptaseptale.
14. The solum nasi is formed as a ventral part of the parietotectal cartilage at the level of the external naris with a considerable duration.
15. The concha nasalis has a moderate depth and a long duration.
16. The maxilloturbinal cartilage has three secondary lamellae
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