For the spinal cord though, we can say that there are three types of neurons: sensory, motor, and interneurons. So just how many types of neurons are there? And how do scientists decide on the categories? For neurons in the brain, at least, this isn’t an easy question to answer. Just from looking down a microscope, however, it becomes very clear that not all neurons are the same. They are the fundamental units that send and receive signals which allow us to move our muscles, feel the external world, think, form memories and much more. O h O nce O ne T akes T he A natomy F inal V ery G ood V acations A re H eavenly.Neurons are the cells that make up the brain and the nervous system.Hypoglossal nerve - motor fibers for tongue movements sensory impulses from tongue.Accessory nerve - motor fibers to sternocleidomastoid & trapezius.Vagus nerves - sensory and motor fibers for pharynx, larynx, and thoracic & abdominal viscera (mostly parasympathetic = promote digestion & regulate heart activity).Glossopharyngeal nerve - sensory for posterior taste buds motor fibers to the pharynx (swallowing & saliva production) carotid artery pressure sensors.Vestibulocochlear nerve - sensory for balance and hearing.Facial nerve - sensory for anterior taste buds motor fibers for facial expression and lacrimal & salivary glands.Abducens nerve - motor fibers to eye muscles (lateral movement).Trigeminal nerve - sensory for the face, nose, & mouth motor fibers to chewing muscles.

Trochlear nerve - motor fiber to eye muscle (superior oblique).Oculomotor nerve - motor fibers to eye muscles (most movements, lens shape, & pupil size).

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