Development of Tongue

• During 5^th week of intrauterine life rapidly proliferating mesenchymal swelling, appear on the internal aspect of mandibular arch, known as lateral lingual swelling.
• A small median projection arises between lateral lingual swelling, the tuberculum impar.
• These 3 swelling arises from the 1^st pharyngeal arch.
• Caudal to this is the copula or hypobranchial eminence, is formed by mesoderm of 2^nd, 3^rd, part of 4^th arch and contributes to tongue structure.
• The point at which the 1^st and 2^nd arches merge is marked by formation of foramen caecum, just behind the sulcus terminalis (a `v` shaped groove).

I.            Foramen caecum gives rise to thyroid.

II.            Lingual swelling gives rise to anterior 2/3 of tongue.

III.            Copula gives rise to posterior 1/3 of tongue.

• By 11^th weeks of foetal life papillae of tongue are seen.
• By 12^th weeks taste buds are seen in the circumvallate papillae.
• By 14^th weeks taste buds can be observed in the fungiform papillae.

Tags: Development of Tongue, formation of tongue, how tongue is form, time of tounge development, tongue:development

Category: Anatomy, Dental, Medical, Oral Anatomy