cranialT brain nerves be esibod Mudpur nbadde The got ge oleM spinal of spinal cord nerves lomibains o sdi olfactory- olfactory lobe nerve cerebrum optic lobe (cerebellum not shown) Fig. 18.32 midbrain Nervous system of a frog solo cranial medulla oblongata nerves spinal cord brain from the body The left atrium receives blood from the
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.
Observe the illustration of a frog’s brain in the picture. Judging from the features of the brain, what two senses would appear to be most acute in a frog?
1a. Upon what features of the brain would you base this conjecture?
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