Oral Histology - Facial Growth Fig. A frontal section through an embryo at a still later stage of development. The nasal septum has fused with the palatal processes. The mesenchyme is now continuous between the palatal processes, and the line of fusion is indistinct.
Bone formation is still at a very early stage in the palatal processes.
The tongue is below, and the two halves of the developing mandible below the tongue are on the left and right.