Facial development begins in the third week of embryonic development.
The early stage of facial development can be divided into two steps: one is the growth and differentiation of facial protrusions; the other is the union and fusion of various protrusions. Facial development begins in the third embryonic week. At the end of the fourth embryonic week, the end of the frontonasal process is divided into three protrusions by two depressions, with the middle rhinal process in the middle and lateral rhinal processes on both sides. In the 5th week, the middle nasal process grows rapidly, and two bulbous processes appear at the end.
The face is located above the neck of the human body and directly in front of the head. The face consists of the eyes, ears, nose, mouth, and cheeks among the facial features, and is the most important image of the human body. The face is composed of musculoskeletal and various tissues.