Nervous

The brain is the most complex organ, containing approximately 86 billion neurons and a roughly similar number of glial and other n...

The cerebellum little brain is located behind the brainstem, containing more than half of all neurons in the brain despite making ...

The retina is the light sensitive tissue lining the back of the eye, approximately 0.5 mm thick. It has ten layers. Photoreceptors...

The twelve cranial nerves emerge directly from the brain and brainstem. I Olfactory smell from olfactory mucosa to olfactory bulb....

The spinal cord is approximately 45 cm long, extending from the foramen magnum to the conus medullaris at L1 to L2 in adults. It g...

The meninges are three membranes surrounding the brain and spinal cord. Dura mater tough mother is the thick outermost layer, adhe...

Cerebrospinal fluid CSF is a clear fluid produced by choroid plexus in the brain ventricles at approximately 500 mL daily, with ap...

The brainstem connects the cerebrum and cerebellum to the spinal cord and is made up of three parts: the midbrain, the pons, and t...

The thalamus is a paired, egg shaped mass of gray matter sitting on either side of the third ventricle, deep within the brain. It ...

The hippocampus is a curved structure in the medial temporal lobe of each hemisphere whose name comes from the Greek word for seah...

The amygdala is a small, almond shaped cluster of nuclei located deep in each temporal lobe, just in front of the hippocampus, and...

The basal ganglia are a group of interconnected nuclei deep within the brain, including the caudate nucleus and putamen, together ...

The corpus callosum is a broad, flat band of nerve fibers lying beneath the cerebral cortex at the midline of the brain, and it is...

The cerebral cortex is the thin outer layer of gray matter covering the cerebral hemispheres, only a few millimeters thick but hig...

The autonomic nervous system is the part of the peripheral nervous system that regulates bodily functions largely without consciou...

The vagus nerve is the tenth cranial nerve and the longest, its name coming from the Latin word for wandering. It leaves the medul...

The sciatic nerve is the largest and longest nerve in the human body, roughly as thick as a finger where it begins. It forms from ...

The brachial plexus is a network of nerves formed from the anterior rami of the fifth cervical to first thoracic spinal nerves. It...

Neurons are the electrically excitable cells that carry information through the nervous system. A typical neuron has a cell body c...