The septum pellucidum is a thin, membrane-like structure located in the brain, situated between the two lateral ventricles. It is part of the limbic system and plays a role in the brain's emotional and memory functions. The septum pellucidum is composed of two layers of tissue and is filled with a small amount of cerebrospinal fluid. This structure is important for maintaining the shape and integrity of the lateral ventricles, which are fluid-filled cavities in the brain. While the septum pellucidum itself does not have a specific function, it is associated with various neurological conditions when abnormalities occur, such as in cases involving the ventricles or limbic system.