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What are the 3 Primary functions of the nervous system?
- Sensory input
- motor output
What function of the nervous system monitors stimuli, changes inside and outside the environment?
What function of the nervous system processes and interprets sensory input by different parts of the CNS?
What function of the nervous system is a response to stimuli sent by the CNS to an effector organ (muscle,gland or internal organ)
what division of the NS contains the brain and spinal cord?
*integrating and control center
*interprets sensory input/dictates motor output
Central Nervous System CNS
What division of the NS is NOT protected by the skull or spine?
*links all parts of the body to the CNS
*nerves extend from the brain and the spinal cord
Peripheral Nervous System PNS
What are the two groups of Peripheral Nerves?
- Spinal Nerves-carry impulses to and from spinal cord
- Cranial Nerves- carry impulses to and from brain
What are the two functional subdivisions of the PNS?
- Sensory (afferent) Division
- Motor (efferent) Division
What PNS subdivision consist of nerve fibers that carries impulses toward the CNS from receptors located throughout the body?
Sensory (afferent) Division
What are the two sensory fibers and their functions?
- Somatic sensory fibers: convey impulses from the skin,skeletal muscle and joints
- Visceral sensory fibers: transmit impulses from the visceral organs
What PNS subdivision consist of nerve fibers that transmits impulses from the CNS to effector organs, these impulses activate muscles to contract and glands to secrete?
Motor (efferent) Division
What are the two main parts to the motor division of the PNS?
- Somatic Nervous System
- Autonomic Nervous System
What part of the motor division is voluntary and consist of somatic motor nerve fibers that conduct impulses from the CNS to skeletal muscles?
Somatic Nervous System
What part of the motor division is involuntary and consist of visceral motor nerve fibers that conduct impulses from the CNS to glands and organs, regulates the activity of smooth muscle, cardiac muscle and glands?
Autonomic Nervous System
What are the two subdivisions of the ANS that for the most part oppose one another in controlling involuntary functions, whatever one stimulates the other inhibits?
- Sympathetic division ( fight or flight)
- Parasympathetic division ( rest and digest)
What are the two types of nerve cells?
What nerve cell surrounds and wraps neurons for protection and support?
what nerve cell is excitable ( responds to stimuli) and transmit electrical impulses?
What are the 6 types of Neuroglia cells?
- ependymal cells
- satellite cells
- Schwann cells
What neuroglia are found in the CNS?
- ependymal cells
What neuroglia cells are in the PNS?
- Satellite Cells
- Schwann Cells
What neuroglia cell forms a barrier known as the blood brain barrier, recycle and recaptures neurotransmitters and soak up leaked ions (potassium)? Most abundant neuroglia cell...
What neuroglia cell monitors health of neurons and defensively protects them, these cells are found at injury sites.
What neuroglia lines the central cavities of the brain and spinal cord, ciliated and play a role in formation of cerebrospinal fluid CSF and circulation.
what neuroglia cells myelinates an axon of an individual axon in the CNS?
What neuroglia cells myelinate groups of axons (as many as 60) in the PNS?
What neuroglia cells are in the PNS and have unknown functions, found surrounding neuron bodies, thought to have many of the same functions as astrocytes in the CNS?
*a functional unit of the nervous system
*requires abundant oxygen and glucose
*specialized nerve cell that generates, conducts and transmits messages (nerve impulses, AP)
* can not survive more than a few minutes w/out oxygen
This structure of a neuron is also called the Soma and Perikaryon, mostly located in the CNS protected by skull and spine
*contains unique rough ER (nissle bodies) (chromatophilic substance)-color loving
Neuron Cell Body
Clusters of cell bodies w/in the CNS are called what?
Clusters of cell bodies in the PNS are called what?
- ganglia (outside protection of skull and spine)
- means-knot on a string, swelling
many branch like, short receptive input regions of a neuron, convey messages toward the cell body
single long output extension of a neuron, can vary in length up to 4 ft, transmits messages away from the cell body