Assertion: choroid | /r/MadeOf | large membrane-lined lacunae
Facets:
Source sentences:
text: It has several unusual features: It contains large membrane-lined lacunae, which, at least in birds, function as part of the lymphatic drainage of the eye and which can change their volume dramatically, thereby changing the thickness of the choroid as much as four-fold over a few days (much less in primates).