Nerve Structure - PDF

RE +  - any change in an organism's internal or external environment that causes the organism to react responds to stimulus What examples can you give to showing the functions of the nervous system? Which is the sensory input? integration? motor output? Sensory...

RE +  - any change in an organism's internal or external environment that causes the organism to react responds to stimulus What examples can you give to showing the functions of the nervous system? Which is the sensory input? integration? motor output? Sensory Input gathering information monitor changes occurring inside and outside the body Integration to process and interpret sensory input and decide if action is needed Motor output a response to integrated stimuli https://poweredtemplate.com/03777/0/index.html NEURONS (nerve cells) specialized transmit messages Transmit electrochemical messages called nerve impulses to other neurons and effectors (muscles or glands)  NEURON STRUCTURE MAIN REGIONS 1. Dendrites 2. Cell Body 3. Axon  NEURON STRUCTURE Nerve Impulse - the way neurons communicate with one another; are mostly electrical signals DENDRITES - short - receive impulses from other neurons - conduct impulses toward the cell body  NEURON STRUCTURE CELL BODY - “soma” - connects to the dendrites and axon - where the nucleus and cell organelles are found  NEURON STRUCTURE - gap between one neuron's axon and another neuron's dendrite AXON - “nerve fibers” - long - sends nerve impulses away from the body - transmits signals to other cells at synapses NEURON STRUCTURE  NEURON STRUCTURE cone-shaped base of an axon end of a branch where nerve of an axon impulses are conducts generated electrical signals to a synapse  29-26 NEURON STRUCTURE Dendrites  Schwann Cells - neurological Schwann cells cells Axon  - produce myelin sheath. Myelin sheath protects the nerve cells German physician and physiologist  29-28 NEURON STRUCTURE  Myelin Sheath - covers the axon - speeds up the travel of the nerve impulses Myelinated & Unmyelinated neurons  NEURON STRUCTURE space between Schwann cells; nerve impulse move from node to node  NEURON STRUCTURE fibers in the neuron; protein transportation granules (RER); protein synthesis  NEURON TYPES sense or gan cell dendrites direction of body electrical signal myelin sheath axon le musc nerve endings motor neuron interneuron sensory neuron sends signals to your connects neurones to sends signals from muscles to tell them to other neurones your sense organs move  NEURON TYPES “afferent neurons” sense or gan Sensory neurons - receives impulses from the sense organs send impulses from receptors to the brain and spinal cord nerve endings  NEURON TYPES “association neurons” dendrites Interneurons - (from the spinal cord and brain) -reads impulses from the sensory neurons -determines what response should be generated nerve -carry the impulse to the endings motor neurons  NEURON TYPES “efferent neurons” Motor neurons - stimulate effector cells - carry impulses away from the spinal cord and brain to a gland or muscle, resulting to a le musc response  29-36 REFLEX ARC a nerve pathway involving the three types of neurons