Anatomy and Physiology of Special Sensory Organs
Sensory organs can be labeled as special sensory structures that permit sight, hearing, odor, and flavor. Sensory structures permitting proprioception, touch, thermal, and pain perception can be classified as more advanced sensory organs. The sensory neurons are trained to find out modifications in the external and internal conditions so that a person's body can react to that change. A stimulus is the first signal that is recognized by any sensory receptor of the body. Stimulus is an impulse generated when there is a change in the surroundings of a person. For example, a heated environment will alert the brain through the thermal sensory organs and generate a reflex accordingly.
Sensory Receptors
The human sensory system is one of the most complex and highly evolved structures, which processes a myriad of incoming messages. This well-coordinated system helps an organism or individual to respond to external stimuli, appropriately. The sensory receptors are an important part of the sensory system. These receptors are specialized epidermal cells that respond to external environmental stimuli. These receptors consist of structural and support cells that form the peripheral unit of the receptor and the neural dendrites which receive and detect the external stimuli.
Enumerate the steps involved in process of sense of sight.
Vision relies chiefly upon one tangible organ—the eye. Eye developments differ in complexity relying upon the necessities of the living being. The human eye is one of the most complicated structures on earth, and it requires numerous segments to permit our advanced visual abilities. The eye has three significant layers:
1.the sclera, which looks after, secures, and supports the shape of the eye and includes the cornea;
2.the choroid, which gives oxygen and sustenance to the eye and includes the pupil, iris, and focal point; and
3.the retina, which permits us to peices images together and incorporates cones and rods.
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