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30 Cards in this Set
- Front
- Back
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Functions of the Nervous System
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1. sensory receptors to monitor changes inside & outside the body
2. processes & interprets the sensory input 3. causes a response by activating muscles or glands |
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Central Nervous System (CNS)
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consists of brain and spinal cord
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CNS Functions
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- interpret incoming sensory info
- issue instructions to rest of the body |
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Peripheral Nervous System (PNS)
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- consists of:
- ganglia (nerve cell bodies) - nerves (cranial and spinal nerves) |
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PNS Function
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communication lines linking the entire body
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Autonomic Nervous System (ANS)
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1. sympathetic: "fight or flight" (extreme situations)
2. parasympathetic: "resting and digesting" (body at rest) |
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neuron
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nerve cells that transmit impulses
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neuroglia
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supporting cells of neural tissue
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f'n of glial cells
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support, insulation, and protection
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astrocytes
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1. brace and anchor neurons to capillaries
2. control chemical environment in brain (CNS) |
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microglia
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- dipose of debris
(CNS) |
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ependymal
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f'n: beating of cilia helps circulate cerebrospinal fluid
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oligodendrocytes
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- wrap their flat extensions around axons
- CNS cells that form myelin sheath |
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schwann cells
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- cells of the PNS that form myelin sheath
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satellite cells
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protective and cushioning cells of PNS neurons
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synapse
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separation between axon terminal and next neuron
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myelin
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covers most neurons
f'n: protect, insulate, and speed up neural transmissions |
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dendrite
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receives info
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axon
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releases infov
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nodes of Ranvier
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gaps of myelin sheath
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white matter
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myelinated fibers
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gray matter
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unmyelinated fibers and cell bodies
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Sensory Nueron
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Sends impulse towards CNS
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Receptors
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Activated by specific changes nearby(stimuli)
(taste, hearing, sight, equilibrium, smell) |
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Cutaneous sense organs
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Pacinian & meissner corpuscles
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Proprioceptors
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Located in muscles & tendons
Detects amount of tension or stretching Determines location, posture, and tone (muscle spindle + Golgi tendon organs) |
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Pain receptors
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Bare dendrite endings
Least specialized cutaneous receptors BUT Most numerous cutaneous receptors |
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Motor Neuron
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Impulse travels away from CNS
Efferent neuron (meaning impulses conduct outwards from the brain or spinal cord) Cell bodies inside CNS in nuclei |
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The largest part of the brain is the (paired)(1.) _______.
The other major subdivisions of the brain are the (2)______ & (3)______. The cavities found I the brain are called (4)______ & contain (5)_________. |
1)
2) 3) 4) 5) |
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A (1)_______ is an elevated ridge of cerebral cortex tissue. The convolutions oxen in the cerebrum are important because they increase (2)______. Grey matter is composed of (3)_______. White matter is composed of (4)______, which provide the communication between different parts of the brain as well as with lower CNS centers. The lentiform nucleus & the other nuclei are collectively called the (5)______.
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1)
2) 3) 4) 5) |
