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