intro Flashcards
what are the 3 basic functions of the nervous system?
- sensation
- perception
- action
what are the 5 distinguishing features of an advanced nervous system?
- cell specialization
- areal specialization
- functional cooperation
- adaptability
- high info storage capacity
what type of glial cell does this statement describe?
“long cytoplasmic processes which bridge neurons & capillary endothelial cells”
astrocytes
what type of glial cell does this statement describe?
“ characteristic limited number of dendritic processes that provide electrical insulation for adjacent neurons”
oligodendrocytes
where do oligodendrocytes originate from?
embryonic ectoderm
where do astrocytes originate from?
embryonic ectoderm
what type of glial cell does this statement describe?
“characteristic small size derived from hematopoetic sources & provide protection”
microglia cells
what did galvani’s experiment with the frog legs demonstrate?
that electrical stimulation can trigger muscle contraction
what are the 3 major functional classes of neurons?
- sensory/afferent
- motor/efferent
- interneurons
describe the length of a sensory/afferent neuron’s axon and dendrite
long dendrite
short axon
describe the length of a motor/efferent neuron’s axon & dendrite
short dendrite
long axon
what are the 2 types of neurosensory receptors found in the skin?
- free nerve endings with little or no myelin
2. thicker myelinated axons arising from classes of mechanoreceptors
