![]() The brainstem contributes to the control of breathing, sleep and circulation. Keywords: brain metabolism brain size cell size. Brainstem - found at the base of the brain, it forms the link between the cerebral cortex, white matter and the spinal cord. The emerging evidence that the glia/neuron ratio varies uniformly across the different brain structures of mammalian species that diverged as early as 90 million years ago in evolution highlights how fundamental for brain function must be the interaction between glial cells and neurons. Cerebellum - responsible for psychomotor function, the cerebellum co-ordinates sensory input from the inner ear and the muscles to provide accurate control of position and movement. the basal ganglia the structure called the thalamus, and the 'white matter', which consists mostly of myelinated axons. It covers the nuclei deep within the cerebral hemisphere e.g. ![]() The outer layer of the brain is known as the cerebral cortex or the 'grey matter'. ![]() Cerebrum - divided into two hemispheres (left and right), each consists of four lobes (frontal, parietal, occipital and temporal). Weighing about 3 pounds (1.4 kilograms), the brain consists of three main structures: the cerebrum, the cerebellum and the brainstem. There are many types of synapses, many types of neuroplasticity in wide networks, and many different types of postsynaptic densities (the complex structure in the post synaptic neuron with over 1000 large intersecting proteins.). The central nervous system (CNS) consists of the brain and the spinal cord, immersed in the cerebrospinal fluid (CSF). Connections are made and pruned each day and one neuron can have 100,000 connections.
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