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49 Cards in this Set
- Front
- Back
The nervous system is composed of what?
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neurons and neuroglia
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What is at the end of peripheral nerves and gather information and converts it into nerve impulses
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sensory receptors
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sensory impulses are intergrated into the brain as
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perception
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what is the intergrative function of the nervous system?
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perception
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conscious or subconscious decisions follow leading to motor functions via the what
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effectors
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The central nervous system is made up of the?
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brain and spinal cord
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The peripheral nervous system is made up of the ?
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Receptors and the peripheral nerves that connect the cns to the rest of the body
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a nerron has a?
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Cell body
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a bundle of nerve fibers are called
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Axons
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nerv fibers include a solitary out going axon and numerous what?
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Dentrites
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Dendrites do what?
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Bring in the impulses from the receptors(recieves messages)
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What are the three types of neurons? (classified by structure
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Multipolar,Bipolar, unipolar
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how do the three differ?
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By the number of dendrites
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What are afferent neurons that conduct impulses from the peripheral receptors to the CNS
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sensory neurons
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Sensory neurons are usually what type of neuron?
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unipolar
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What are the neurons that are multipolar that lie within the CNS and form links between other neurons?
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interneurons
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What neurons are multipolar and conduct impulses from the CNS to the effectors?
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Motor neurons also called efferent neurons
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The junction between two communicating neurons is called the
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synapse
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what is between two communicating neurons that the synapse has to go through?
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synaptic cleft
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What is the largest most complex portion of the nervous system and contains 100 billion multipolar neurons?
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The brain
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The divisions of the brain are?
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Cerebrum, cerebellum, diecephalon, and brainstem
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What is the largest portion of the brain?
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THe cerebrum
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The cerebrum is divided into how many hemispheres?
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2
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A deep ridge of nerve fibers is called?
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The corpus callosum
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The corpus callosum connects what?
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The two hemispheres of the cerebrum
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The surface of the brain is marked by what?
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Ridges called convolutions
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Covolutions are seperated by what?
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Grooves Deep ones called fissure and shallow ones called sulcus
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The Diencephalon contains what two things?
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The Thalamus and the hypothelamus
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What does the Thalamus do?
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sorts and directs sensory information performs the service of both messenger and editor
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What does the Hypothelamus do?
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maintains homeostasis by regulating a wide variety of visceral activity. links the endocrine system with the nervous system
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the brainstem consist of what
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Pons, midbrain and the medulla oblongata
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The brainstem lies at the base of the what?
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cerebrum
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The brainstem connects the brain to the what?
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spinal cord
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What are the functions of the midbrain?
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convey impulses to and from the cerebrum
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What are the functions of the pons?
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regulates breathing and blood pressure
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What are the functions of the Nedulla oblongata?
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To transmit asending and desending impulses
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What are the functions of the cerebellum?
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is a reflex center for integrating sensory information concerning the position of body parts(balance muscle movement and posture
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The autonomic Nerous system does what?
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Helps to maintain homeostatis with or without concious help
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Neurons are what?
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Masses of nerve cells and they are the structual and functional units of the nervous system
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Neuroglial cells provide what for a neuron?
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Physical support, insulation and nuetrients
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What fills spaces provides stuctural framework, produces the lipoprotein myelin and carrys on phagocytosis?
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THe neuroglia
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Microglial cells are located where?
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CNS
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Microglial cells do what?
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Support neurons and phagocytize bacteria cells and cellular debri
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What does the Oligodendrocytes do?
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they provide insulating layers of myelin which is called a myelin sheath around the axon CNS
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What do the Astrocytes do?
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Found between neurons and blood vessels and they provide sturctural support and form scar tissue CNS
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What is a Ependymal cell and what does it do?
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forms inner linings that enclose spaces within the brain and the spinal cord CNS
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A neuron includes 3 common features what are they?
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a cell body, dendrites and an axon
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Nerves can be what kinds?
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Sensory motor or mixed
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what forms a myelin sheath around an axon in the pns
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Schwann cells
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