GENERAL HISTOLOGY

Detailed explanation-1: -The nuclear envelope (NE) is a highly regulated membrane barrier that separates the nucleus from the cytoplasm in eukaryotic cells.

Detailed explanation-2: -The Nuclear Envelope-The nuclear envelope is a double-layered membrane that encloses the contents of the nucleus during most of the cell’s lifecycle.

Detailed explanation-3: -The nucleus is surrounded by a system of two concentric membranes, called the inner and outer nuclear membranes. The outer nuclear membrane is continuous with the endoplasmic reticulum, so the space between the inner and outer nuclear membranes is directly connected with the lumen of the endoplasmic reticulum.

Detailed explanation-4: -The nuclear envelope is perforated with tiny holes known as nuclear pores, which were first discovered in the mid-twentieth century.

Detailed explanation-5: -So, the correct answer is ‘Porous double membrane’.