Posterior one-third of the tongue develops from -
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.
Lingual swellings
Tuberculum impar
Hypobranchial eminence
Tongue bud