The medial nasal swellings (intermaxillary segment) fuse with the maxillary swellings, thus forming the upper lip. The lateral nasal swellings unite with the maxillary swellings along the nasolacrimal groove.
The mandibular swellings merge, giving rise to the lower jaw (mandible), lower lip and the inferior part of the face.
The cheeks are formed by the fusion of the maxillary swelling and mandibular swellings, followed by the positional changes
of the tongue and the floor of the mouth, and broadening of the mandible.

1. Stomodeum
2. Eye
3. Maxillary swelling
4. Mandibular swelling
5. Nasal pit
6. Frontal swelling
7. Lateral nasal swelling
8. Medial nasal swelling

1. Stomodeum
2. Eye
3. Maxillary swelling
4. Mandibular swelling
5. Nasal pit
6. Frontal swelling
7. Lateral nasal swelling
8. Medial nasal swelling
9. Nasolacrimal groove

The palate develops from the primary and the secondary palate.
The primary palate develops from the innermost part of the intermaxillary segment. The secondary palate is formed of two shelf-like outgrowths from the maxillary swelling. In the seventh week, these shelves fuse with each other to form the secondary palate. Anteriorly, these shelves also fuse with the primary palate and cranially with the nasal septum. The incisive foramen is considered the midline landmark between the primary and secondary palate.

1. Stomodeum
2. Oronasal membrane
3. Tongue
4. Telencephalic wall
5. Nasal pit
6. Medial nasal swelling

1 . Primary palate
2 . Primitive choana
3 . Tongue
4 . Oral cavity

1. Lower lip
2. Tongue
3. Secondary palate
4. Upper lip
5. Definitive choana
6. Primary palate

The nasal pits deepen into the underlying mesenchyme. They are temporally separated from the primitive oral cavity by the oronasal membrane. After the rupture of this membrane the pits open into the oral cavity by way of primitive choanae, immediately behind the primary palate.
The formation of the secondary palate causes the separation of the primitive oral cavity into the definitive oral and nasal cavities. The definitive choanae are located at the junction of the nasal cavity and the pharynx.

1. Nasal septum
2. Nasal chamber
3. Tongue
4. Palatine shelf

1. Nasal septum
2. Primary palate
3. Palatine shelf