nucleus pulposus
medullary cavity
Most of the umbrella mass is a gelatinous material - the jelly - called mesoglea which is surrounded by two layers of protective skin. The top layer is called the epidermis, and the inner layer is referred to as gastrodermis, which lines the gut.
Most of the umbrella mass is a gelatinous material - the jelly - called mesoglea which is surrounded by two layers of protective skin. The top layer is called the epidermis, and the inner layer is referred to as gastrodermis, which lines the gut.
The disks are firm yet compressible. On outer side you have tissue called as annulus fibrosus. On inner side you have soft gelatinous tissue called as nucleus pulposus.
Inner Medulla
The liquid region above the Earth's inner core is the outer core.
The Medulla is the inner region of a lymph node. It contains B cells, plasma cells, and macrophages.
The Inner Core is the most dense part of the Earth. It is a solid core of iron and nickel.
Outback
Inner core
Adrenal Medulla
The outer Oort cloud. (The inner Oort cloud is believed to be disk-shaped.)