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Definition
| System comprised of neurons, brain, cranial nerves, ganglia, enteric plexueses, and sensory receptors. |
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| Contains 100 Billion neurons, found in cranium |
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| Twelve pairs of nerves that emerge from the base of the brain |
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| A grouping of axons, connective tissue, and blood vessels that lies outside the brain and spinal cord |
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Definition
| Connects to the brain via the foramen magnum. Contains 100 Million neurons. |
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| Thirty-one pairs of nerves that emerge from the spinal cord. |
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Definition
| Bundle of nervous tissue, mainly neurons, occuring outside of the brain/spinal cord |
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| Networks of neurons found in the walls of the gastrointestinal tract, which regulate the digestive system. |
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Definition
| Specialized cells which monitor changes in the environment. Also, the dendrites of sensory neurons. |
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Term
| Functions of the Nervous System |
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Definition
| Sensory, Integrative, Motor. |
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Term
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Definition
| Detect either internal (ex. change in blood pH) or external (ex. physical contact) stimuli. |
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Definition
| Carry sensory info towards the brain |
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Definition
| Processing information, making decisions, etc. Perception (consious awareness of stimulus) is key. |
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Definition
| Short neurons with axons that contact nearby neurons. Most of the neurons in the body are interneurons. |
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Definition
| System whereby the nervous system elicits a response via efferent neurons |
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Definition
| carry motor signals away from brain |
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Definition
| Muscles and glands that change environment |
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Term
| Central Nervous System (CNS) |
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Definition
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Term
| Peripheral Nervous System (PNS) |
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Definition
| ...all other nervous tissue. |
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Definition
| Sensory neurons that convey info from sensory receptors such as eyes etc to the CNS. Motor neurons going to |
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| Sensory Neurons that convey info from autonomic sensory receptors, like those in organs to the CNS, and motor neurons that carry responses to smooth and cardiac muscle, and to glands. Involuntary. |
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Definition
| flight-or-flight response system found in ANS. antagonistic to the Parasympathetic division. |
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Definition
| controls rest-and-digest activity in the ANS. antagonistic to the sympathetic division. |
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Term
| Enteric Nervous System (ENS) |
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Definition
| made up of enteric plexuses throughout the gastrointestinal tract. Functions independanently of CNS and ANS, to some extent. Propels food through GI tract, handles secretions, etc. |
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Definition
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Term
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Definition
| the ability to respond to a stimulus and convert it into an action potential |
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Term
| Action Potential (Nerve Impulse) |
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Definition
| Electrical signal which travels down a neuron. Starts with the movement of ions in the interstitial fluid and inside the neuron via ion channels. |
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Definition
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Definition
| and neuronal process or extension that emerges from the cell body. Dendrites, axon, etc. |
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Definition
| Where nerve recieves input. Short and branched from the perikaryon. look like trees. |
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Definition
| Output. Cylindrical projection from the perikaryon. Joins the cell body at the axon hillock (raised bump). Part closest to the hillock is the initial segment. |
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Term
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Definition
| Axonic cytoplasm. surrounded by a membrane (axolemma) |
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