mitted to the Ottawa General Hospital after an accident that happened as they te at night. Here is what the patient reported upon admission at the hospital: home last night and did not see a hole on the sidewalk. It was very dark outside, Inot see anything. I fell on the ground and hit my head hard. In the last month this few times, where I feel I am totally blind at night. I can see just fine during the or if the light is dim. I have also felt pretty tired the last few days." e hospital, a blood test was performed on the patient and some of results were as Blood concentrations Patient 7 µg/dL 0.7 mg/dL Normal range 20-60 µg/dL 0.6-2 mg/dL tests, the doctor confirms that the patient's vision is altered but only in dark
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.
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