Nervous Tissue Flashcards
structural division of nervous system
CNS vs. PNS
subdivision that includes the brain and spinal cord
CNS
subdivision that includes the cranial nerves, spinal nerves, and ganlia
PNS
clusters of neuron cell bodies located outside the CNS
ganglia
touch, pain, pressure, vibration, temperature, proprioception , and the special senses
considered voluntary (or conscious) functions of the “somatic sensory”
temperature and stretch of muscles of organ wall, transmit from blood vessels and viscera of internal organs to CNS
considered involuntary (or unconscious) functions of the “visceral sensory”
Example of becoming aware of visceral sensations when they are extreme
painful bloating of the stomach after eating too much
conducts nerve imppulses from CNS to skeletal muscles, causing them to contract
voluntary function of “somatic motor”
innervates internal organs and regulates smooth muscle, cardiac muscle, and glands
involuntary function of “autonomic motor”
condition caused by improper function of autonomic motor component, characterized by numerous problems (fainting/syncope, slow or fast HR, GI issues, thermoregulatory issues, visual blurring, and seizures)
dysautonomia
Two cell types that form nervous tissue
neurons vs. glial
excitable cells that initiate and transmit nerve impulses
neurons
nonexcitable cells that support and protect other cell type
glial cells
3 basic structural features all neurons share
- cell body
- dendrites
- axon
have high metabolic rate, extreme longevity, and most cease mitosis after fetal development
neurons
