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Sense organs provide getting of information about condition and change of surroundings and of activity of systems of organism. They are peripheral parts of analyzers, i.e. sensory organs.
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Analyzers are aggregations of organs and structures, providing perception of different irritations, acting into organism, formation and coding of external energy into nerve impulse. This nerve impulse passes along nerve ways to subcortical and cortical centers, where analysis of information and formation of subjective sensation occur.
Each analyzer has 3 parts:
Peripheral or receptor, is represented by organs in which receptor cells are present, they recept signals from external environment and from internal organs.
Intermediate or conducting- these are intercalated neurons along which nerve impulse passes from receptor cells to cortical centers.
Central part represents parcels of cortex of large hemispheres, where terminal analysis and synthesis of percept sensation occur.
Classification of sense organs:
3 types:
Sense organs, which receptors are specialized neurosensory primary-sensory cells, transforming external energy into nerve impulse. These organ of vision and olfactory organ. Source of development is nerve lamina.
Sense organs, which receptors are sensoepithelial, secondary-sensory. From them irritation passes to dendrites of sensory neurons, which percept excitation and born nerve impulse. These are organ of hearing and equilibrium and gustatory organ. Source of development is ectoderm.
Not marked anatomically organ form. These are group of receptor capsulated and encapsulated nerve endings.
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