Hi!
Could you please be more specific, so that I can answer your question properly? Layer of what?
So when they have kids they don't pass down the disease
This question is pretty vague and confusing.
Answer: excessive accumulation of endolymph <span><span> M</span>énière disease is a disorder affecting one ear (inner ear) that shows clinical manifestations of vertigo, tinnitus, hearing loss, and sensations of fullness in the ear. <span>It is an excessive accumulation of endolymph in the membranous labyrinth</span></span>