Brain and Cranial Nerves

 The human brain is the most sophisticated brain compared to other species.

Gray and White Matter

Cortex

Superficial layer

Composed of gray matter - site of neuron cell bodies, dendrites and synapses

Medulla

Deep to cortex

Composed of white matter - composed primarily of tracts or bundles of myelinated axons, which connect one part of the brain to another and to the spinal cord

Meninges

Layers of connective tissue for protection of the brain

Ventricles

Several large 'spaces' filled with cerebrospinal fluid (CSF). CSF forms a liquid cushion in and around the brain and spinal cord that is constantly drained and replaced.

Cerebrospinal Fluid  

 Blood-Brain Barrier

Seals nearly all of the blood capillaries throughout the brain tissue.

Important protective device

Highly permeable to water, glucose, lipid-soluble substances such as oxygen and carbon dioxide, and drugs such as alcohol, caffeine, nicotine, and anesthetics.

Place the following components in order from internal to external layers of the brain

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