The follicle is the structure that surrounds the egg as it ripens. These fluid filled sacs are found in the ovaries.
The mesoterium is the structure that surrounds the ovaries.
The Shell
The egg ripens in the ovary.
The bony structure that surrounds the brain is known as the skull, or "cranium".
In flowering plants, one or more seeds develop within an ovary. The seed coat, which is the hard structure that surrounds the seed, develops from the wall of the chamber where the fertilized egg begins to develop.
Golgi body
the cell wall
cranium
ribosomes surrounds the cell
The nuclear membrane.
The thin structure that surrounds a cell is known as a cell membrane. However plant cells have a cell membrane and a cell wall.
the RER (rough endoplasmic reticulum)