The muscles have no tone and no movement during sleep paralysis. Sleep paralysis occurs when falling asleep or when waking up. Vivid terror or stress dreams are associated with sleep paralysis. If the paralysis episodes recur then see a sleep specialist for evaluation. In brief: Sleep paralysis.
Lacrimal sac. The lacrimal sac or lachrymal sac[1] is the upper dilated end of the nasolacrimal duct, and is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla. It connects the lacrimal canaliculi, which drain tears from the eye's surface, and the nasolacrimal duct, which conveys this fluid into the nasal cavity.
lacrimal apparatus. (lakÂ´rÉmÉl), n a network of structures of the eye that secrete tears and drain them from the surface of the eyeball. The parts include the lacrimal glands, the lacrimal ducts, the lacrimal sacs, and the nasolacrimal ducts.acrimal apparatus. a group of organs concerned with the production and drainage of tears; it is a nutritive and protective device that helps keep the eye moist and free of dust and other irritating particles.