Introduction to the Nervous System Flashcards
Afferent or efferent nerves are used for assessment?
Afferent
Afferent or efferent nerves are used for control and coordination?
Efferent
Is there endocrine singaling in the nervous system?
No
Paracrine
Autocrine only
What are the neurotransmitters used in a parasympathetic reflex arc? Sympathetic?
Acetylcholine, acetylcholine
Acetycholine, norepiinephrine
What are the components of the CNS?
Brain & spinal cord
What are the components of the peripheral nervous system?
Somatic
Outside brain & spinal
What are the divisions of the autonomic nervous system?
Parasympathetic & sympathetic
Visceral & somatic nervous system
What are the 3 plexuses of the enteric nervous system?
myenteric, submucosal, Mucosal
What are the supportive cells of the neroglia?
Astrocytes, oligodendrocytes
Schwann cells
Satellite cells
What is the 1st transmitter of the sensory reflex arc? 2nd?
Glutamine
Acetylchline
Will a reflex arc ever produce a variable response? How is this response described?
No
Reflexes are stereotypic
What are the 5 components of the reflex arc?
Sensors myelinated afferent neuron Integration/processing myelinated efferent neuron Effector organ
What is the logic gate of the nerve cell?
Axon hillock
Why do nerve cells also have some autocrine function?
Re-uptake & regulation of singal
What are the primary sensory components and signal integration of the nerve cell?
Dendrites & soma
What is the metabolic center of the cell/where does neurotransmitter synthesis take place?
Soma
Does signal integration occur along axon?
No
What is the site for excitation-secretion coupling and sometimes neurotransmitter uptake?
Axon terminal
Which synaptic membrane contains Ca2+ voltage gated channels?
Presynaptic
What channels are present on the postsynaptic membrane?
ionotropic neurotransmitter receptors & voltage-gated cation channels (Na+)
How many passes do ion channels (Na, K, Ca) make through the membrane?
6
How fast can signals travel on a myelinated axon?
360ft/s
What neuroglia cells are associated with ganglia?
Satellite cells
How do astrocytes (CNS) function for uptake?
Take up excess K+ to maintain proper ECF
Take up and degrade GABA, Glutamate,etc
Which CNS cells are important for the blood-brain barrier?
Astrocytes
What is the function of ependymal cells?
Form tight junctions & line brain and spinal cavity
