sense organ


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sense organ

a structure in animals that is specialized for receiving external or internal stimuli and transmitting them in the form of nervous impulses to the brain

Sense organ

A structure which is a receptor for external or internal stimulation. A sense organ is often referred to as a receptor organ. External stimuli affect the sensory structures which make up the general cutaneous surface of the body, the exteroceptive area, and the tissues of the body wall or the proprioceptive area. These somatic area receptors are known under the general term of exteroceptors. Internal stimuli which originate in various visceral organs such as the intestinal tract or heart affect the visceral sense organs or interoceptors. A receptor structure is not necessarily an organ; in many unicellular animals it is a specialized structure within the organism. Receptors are named on the basis of the stimulus which affects them, permitting the organism to be sensitive to changes in its environment.

Photoreceptors are structures which are sensitive to light and in some instances are also capable of perceiving form, that is, of forming images. Light-sensitive structures include the stigma of phytomonads, photoreceptor cells of some annelids, pigment cup ocelli and retinal cells in certain asteroids, the eye-spot in many turbellarians, and the ocelli of arthropods. The compound eye of arthropods, mollusks, and chordates is capable of image formation and is also photosensitive. See Photoreception

Phonoreceptors are structures which are capable of detecting vibratory motion or sound waves in the environment. The most common phonoreceptor is the ear, which in the vertebrates has other functions in addition to sound perception. See Ear

Statoreceptors are structures concerned primarily with equilibration, such as the statocysts found throughout the various phyla of invertebrates and the inner ear or membranous labyrinth filled with fluid.

The sense of smell is dependent upon the presence of olfactory neurons, called olfactoreceptors, in the olfactory epithelium of the nasal passages among the vertebrates. See Olfaction

The sense of taste is mediated by the taste buds, or gustatoreceptors. In most vertebrates these taste buds occur in the oral cavity, on the tongue, pharynx, and lining of the mouth; however, among certain species of fish, the body surface is supplied with taste buds as are the barbels of the catfish. See Taste

The surface skin of vertebrates contains numerous varied receptors associated with sensations of touch, pain, heat, and cold. See Chemical senses, Cutaneous sensation, Sensation

Sense Organ

 

a specialized peripheral system by which an animal or human receives and partially analyzes various external stimuli. Each sense organ consists of receptors and auxiliary structures of varying complexity. The remote sense organs—the organs of sight, hearing, and smell—receive distant stimuli, while the organs of taste and touch receive stimuli only upon direct contact.

sense organ

[′sens ‚ȯr·gən]
(physiology)
A structure which is a receptor for external or internal stimulation.
References in periodicals archive ?
Thus, the sense organs, like these new media, pare down and shape
This is especially so, even among persons age 65 or over, for circulatory diseases, mental disorders, and to a lesser extent, injuries and poisonings and the nervous system and sense organs.
There are three ways in which a mirror is similar to a sense organ receiving a sensible form: (1) the mirror does not become the same color as the object reflected, since its material disposition maintains the property of reflecting all wavelengths; (2) the reflected object causes the mirror image; (3) when one looks at an object reflected on a mirror, one sees the object itself, not an image of it.
Moreover, the author argues that the objects of Morandi's inquiry--the brain, the sense organs and reproductive system--"signify a provocative sphere of expertise at distinct odds with contemporary notions about women's inferior nature and restricted intellectual and moral purview" (107).
com's massager boutique, it is easy to find massage tools to relax sense organs and bodies.
Together, these sense organs enable us to acquire and respond to crucial information about our environment.
This first volume covers the order Chilopoda, the centipedes, discussing such aspects as general morphology, integument and associated organs such as solitary epidermal glands and bioluminescence, musculature and locomotion, the excretory system including the maxillary organ of the Notostigmophora and nephrocytes, sense organs, reproduction, ecology, distribution, fossil history, and taxonomy.
Gul said representations abroad are the sense organs of Turkey opening to outside world, noting that the healthiest assessments and necessary critical interventions were made through the ambassadors.
On an insect limb two main categories of sense organs can be found; mechanoreceptors and chemoreceptors, where only the former type are thought to have influence on agile locomotion (Delcomyn, F.
Each of these drives monitors signals from our sense organs, adds its own evaluation, and sends the signals to other parts of the brain.
Later chapters treat various body systems, including the skeletal and muscular systems, nutrition and digestion, the circulatory and respiratory systems, reproduction and early developmental biology, sense organs, and excretion.
But since we further desire knowledge beyond the limits of our unaided senses, and beyond the different limits set by ethical scruples and social convention, we also love the artificial sense organs we have devised: first and foremost, the camera.