To be effective, the spermicide must be placed deep in the vagina, close to the cervix. Creams, gels, and foams are squirted into the vagina using an applicator. Other types of spermicides include vaginal contraceptive film (VCF), a thin sheet placed in the back of vagina by hand, and vaginal suppositories.
Causes of Alzheimer's disease. Alzheimer's disease is caused by parts of the brain wasting away (atrophy), which damages the structure of the brain and how it works.
Alzheimer's Disease Causes. While much progress has been made in Alzheimerâs disease (AD) research, the exact cause is unknown. Many scientists believe that a buildup of two abnormal structures in the brain play an important role. These structures are called amyloid plaques and neurofibrillary tangles.lzheimer's Disease Causes. While much progress has been made in Alzheimerâs disease (AD) research, the exact cause is unknown. Many scientists believe that a buildup of two abnormal structures in the brain play an important role. These structures are called amyloid plaques and neurofibrillary tangles.