• Extends between corpus callosum and fornix
  
  
• Separates anterior horns of left and right ventricle
  
  
• Has two fused layers
  
  
• May contain a cavity- cavum septum pellucidum (5th ventricle)
  
  
• Implicated in pleasure, mood, rage and sexual gratification

Damage or abscence causes:

1. Hypothalamic dysfunction

2. Hypopitituarism

3. problems of vision, coordination and intelligence

4. Sham rage

Functions:  it is implicated in pleasure, mood, rage, and sexual gratification.