Fig. 25. Anterior segment of an eye of a fetus at 95 mm (estimated age, late fourth month) showing the short iridial portion (Ir) and a more developed ciliary portion (Cp) of the forward-growing neuroectodermal cup (× 69). Recognizable primordium of the ciliary muscle (cm) exists. Future ora serrata region is indicated by the arrowhead. Sphincter muscle starts to differentiate in the area shown in the square. cj, conjunctival stroma; C, cornea; Li, eyelid; R, retina; Sc, sclera; Vi, vitreous.