Posterior one-third of the tongue develops from -
Lingual swellings
Tuberculum impar
Hypobranchial eminence
Tongue bud
DEVELOPMENT OF THE TONGUE:-
I. Epithelium

Ant 2/3 - lingual swellings of 1st arch and tuberculum impar
Post 1/3 - large dorsal part of hypobranchial eminence, i.e. 3rd arch
Posterior most part - small dorsal part of the hypobranchial eminence, i.e. 4th arch

II. Muscles
From occipital myotomes except palatoglossus Which is derived from the 6th arch.