Integrative sensations are not well defined but include memory, sleep, emotions etc. Olfactory neurons have dendrites that are connected to fine hairs in the nose that react to odours. Taste buds contain gustatory cells which contain sensitive hair like processes. The retina of the eye converts light into nerve impulses which are transmitted to the optic nerve. Retinoblastoma is a rare tumour in the cells of the retina.
Sound waves cause fine hairs in the inner ear to vibrate generating nerve impulses.
The nerves of the ANS activate the involuntary smooth muscles, cardiac muscles, and some glands. Tumours Childhood CNS Tumours Childhood Brain tumours are the second most common type of childhood cancer. They are however a diverse group of different types of tumours. Classification of brain tumours is based on both histopathology and location in the brain. For example, undifferentiated neuroectodermal tumours of the cerebellum are referred to as medulloblastomas, while tumours with similar histology in the pineal region would be diagnosed as pineoblastomas.