Nucleus pulposus is

Options

A. A type of special cell found in myelin sheath of a nerve cell of vertebrate
B. A depression for pituitary is found in mammalian skull
C. A large nucleus found in Schwann cells of nerve fibre
D. A remain of embryonic notochord found in the central portion of inter-vertebral discs of vertebrae of mammals

Answer

D

Explanation

Nucleus pulposus is the inner core of the vertebrate disc. The core is composed of a jelly like material that consists of mainly water as well as a loose network of collagen fibres. The elastic inner structure allows the vertebral disc to withstand forces of compression and torsion.