They are connected to the brain stem and basically 'run' the head as well as help regulate the organs of the thoracic and abdominal cavities.ĭendrites -Threadlike extensions of the cytoplasm of a neuron.Įffector -Any molecule, chemical, organ, structure or agent that regulates a pathway by changing the pathway's reaction rate. The CNS consists of the brain, the cranial nerves and the spinal cord.Ĭranial nerve -In humans, there are 12 cranial nerves. It consists of the medulla oblongata, the part responsible for cardiac and respiratory control, the midbrain, which is involved in basic, involuntary body functions, and the pons, where some cranial nerves originate.Ĭentral nervous system (CNS) -One of two major divisions of the nervous system. It is a complicated neural center with several neuronal pathways between the cerebrum, spinal cord, cerebellum, and motor and sensory functions of the head and neck. At the end of the axons, nerve impulses are transmitted to other nerve cells or to effector organs.īrachial plexus -A group of lower neck and upper back spinal nerves supplying the arm, forearm and hand.īrain stem -Lowest part of the brain that connects with the spinal cord. Neurons communicate with each other by transmitting signals from branches located at the end of their axons. Each neuron has one axon, which can be longer than a foot. auditory nerve, a sensory nerve for hearing and balance controlĪxon -Long filament of a neuron that carries outgoing electrical signals from the cell body towards target cells.facial nerve, a mixed nerve, the sensory part for taste and the motor part for the control of facial muscles and salivary glands.abducens nerve, a motor nerve for eyeball movement control.trigeminal nerve, a mixed nerve, the sensory part for facial and mouth sensation and the motor part for chewing.trochlear nerve, a motor nerve for eyeball muscle control.oculomotor nerve, a motor nerve for eyelid and eyeball muscle control.optic nerve, a sensory nerve for vision.
0 Comments
Leave a Reply. |