Foetal head. Macro photograph of a section through the head of a foetus. The brain is at top (white). Below the brain is the nasal cavity (centre), with the nasal septum running down its middle, and the two eyes. At bottom is the mouth, with the tongue at its centre. Between the mouth and the nose are four tooth buds (pink). These are aggregations of tissue that will form into teeth. Around the chin and cheeks is a thick layer of fat (pale pink).