Endolymph in the inner ear: (A) Is a filterate of blood serum, (B) Is secreted by Stria vascularis, (C) Is secreted by Basilar membrane, (D) Is secreted by Hair cells
Answer is B. Endolymph fills the membranous labyrinth and rich in K ions and is secreted by stria vascularis and the dark cells present in the utricle and near the ampullated end of semicircular ducts. Reference Dhingra 6th edition pg-24.