In Vivo and Cadaver Studies of the Canalicular/Lacrimal Sac Mucosal Folds

Figure 2

Orifice open/close under the relaxation/stretch of the muscles around the lacrimal sac. (a), (c), and (e) show that the orifices are closed when the related muscles are stretched. (b), (d), and (f) show that the orifices are opened when the muscles are relaxed. It should be noted that there is always a circle area (arrows) around an orifice.

(a)

(b)

(c)

(d)

(e)

(f)