The nuclear envelope has an inner and outer bilayer membrane that separates the nucleus from the cytoplasm. It contains thousands of nuclear pores that act as channels between the nucleus and cytoplasm. The nuclear envelope provides structure to the nucleus and is made up of an outer membrane continuous with the endoplasmic reticulum, an inner membrane containing nuclear proteins, and a perinuclear space between the membranes.

1. NUCLEAR ENVELOPE
• Also known as the Nuclear Membrane
• Has 2 separate bilayers
• Has thousands of nuclear pores
• Separates contents of the nucleus from the
cytoplasm
• Provides structure to the nucleus

2. Structure of Nuclear Envelope
• Outer Membrane
• Continuous to ER
• Has ribosomes
• Cytoplasmic surface
• Perinuclear Space
• Space between inner and outer
membrane
• Lumen of nuclear membrane
• Inner Membrane
• Has nuclear proteins: Laminin, LAP1 &
LAP2, Emerin, and Nurin
• Nuclear Pores
• Protein Channels
• Nuclear Lamina
• Plays role in chromatin organization, cell
cycle regulation, DNA replication and
repair