In photosynthesis, the light-dependent reactions take place on the thylakoid membranes. The inside of the thylakoid membrane is called the lumen, and outside the thylakoid membrane is the stroma, where the light-independent reactions take place.
Lymphangioma is often formed during fetal development because of a blockage and subsequent tangling in your lymphatic system. Your lymphatic system is an important part of your immune system which is where the bacteria and any other foreign substances are destroyed.
A meningioma is a tumor of the protective linings of the brain and spinal cord. These linings are called meninges. Most meningiomas are benign, though some may be cancerous. Benign meningioma tumors are generally slow growing. They usually don't cause problems unless they are pushing on the brainstem and/or compressing structures such as optic and cranial nerves.