Where is perinuclear space present?

The correct option is Between two layers of the nuclear envelope.

Understanding the Perinuclear Space:

The nucleus of a eukaryotic cell is surrounded by a double-membrane structure known as the nuclear envelope. This envelope consists of two distinct concentric lipid bilayer membranes:

1. Outer Nuclear Membrane: This layer faces the cytoplasm and is continuous with the membrane of the rough endoplasmic reticulum.

2. Inner Nuclear Membrane: This layer faces the nucleoplasm and provides structural support via the nuclear lamina.

The fluid-filled space located directly between these two outer and inner nuclear membranes is called the perinuclear space (or perinuclear cisterna). It typically has a width of about 10 to 50 nanometers and serves as a fluid barrier separating the internal contents of the nucleus from the cytoplasm.