2、 ciliary bod A is posterior extension of choroid B. located on external surface of junction of cornea and sclera C is the thickest part of middle tunic D constriction of ciliary m tenses ciliary zonule Econstriction of ciliary m decreases convexity of lens2、 ciliary body A. is posterior extension of choroid B. located on external surface of junction of cornea and sclera C. is the thickest part of middle tunic D.constriction of ciliary m. tenses ciliary zonule E.constriction of ciliary m. decreases convexity of lens