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.
The lacrimal canaliculi, also known as the lacrimal ducts, are small anatomic structures that are part of the system that clears tears from the eyes. These small ducts connect two openings in the inner corners of the eyes to the nasolacrimal ducts, which empty tears into the nose.acrimal canaliculi therefore serve as an important part of the outflow tract by which tears can leave the eyes. Each eye is drained by two canaliculi, although these canaliculi sometimes converge into one single tube before emptying into the lacrimal sac.