Ch. 9 Nervous System
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each of the black spaces below before clicking
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| What are the functions of the nervous system? | Feeling, Thinking, Remembering, Moving, & being aware of the world around you.
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| Another word for nerve cells. | Neurons.
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| Name the two groups the organs of the central nervous system can be divided into. | Central Nervous System(CNS), & Peripheral Nervous System
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| What organs make up the central nervous system? | Brain & spinal cord
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| Where do the nerves of the peripheral nervous system connect? | To the central nervous system
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| Integrated. | Various parts linked or coordinated together.
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| Myelin | Surrounds axon. Layers of lipid protein(lipoprotein)
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| Nodes of Ranvier | Narrow gaps between myelin
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| Myelinated axon | Axon with myelin
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| Unmyelinated axon | Axon without myelin
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| Gray Matter | Unmyelinated axons & cell bodies appear grey in the CNS
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| White Matter | Groups of myelinated axons appear white in CNS
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| Sensory Neurons | Carry impulse from PNS to CNS
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| Interneuron | Found in CNS. Transmit impulses from one part of the brain/spinal cord to another
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| Motor Neuron | Carry impulse out of CNS to board effectors
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| Synapse | Point of communication between neurons
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| What are the 2 groups of neurotransmitters? | Excitatory & Inhibitory
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| Excitatory | Increases probability of nerve impulse ex. Acetylcholine
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| Inhibitory | Decrease chance of nerve impulse ex. dopamine
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| Reflex | Automatic subconscious response to changes within or outside body
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| Meninges | Membranes located between bone and soft tissue of the nervous system
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| What are the 3 types of meninges? | Dura matter, Arachnoid matter, Pia matter
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| Dura matter | Outer most layer tough & fibrous. Function: Protect
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| Arachnoid matter | Thin web like membrane between dura & pia
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| Pia matter | Very thin with many nerves & blood vessels to nourish
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| Spinal cord | Structure: Give rise to spinal nerves, Butterfly shape of gray & white matter. Function: Conducts impulses in/out of CNS
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| What are the 3 major portions of the brain? | Cerebrum, Cerebellum, Brain stem
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| Corpus Callosum | Connects hemispheres
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| Cerebral cortex | Outer part of cerebrum made out of 75% gray matter
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| Cerebrospinal fluid | Completely surrounds the brain and spinal cord occupying subarachnoid space
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| What is the function of the cerebrospinal fluid | Support and protect
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| Thalamus | relay station
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| Hypothalamus | provides a link between endocrine and nervous system
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| Lymbic system | animal brain
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| Mid brain | reflex center for eye and sound
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| Medulla oblongata | controls heart rate, respiratory rate and vasomotor
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| vasomotor | blood vessels constricting/dialating
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