olfaction


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smell

 [smel]
the sense that enables one to perceive odors; it depends on the stimulation of sense organs in the nose by small particles carried in inhaled air. It is important not only for the detection of odors, but also for the enjoyment of food, since flavor is a blend of taste and smell. Taste registers only four qualities: salt, sour, bitter, and sweet; other qualities of flavor depend on smell. Called also olfaction.



The organs of smell are small patches of special cells (olfactory cells) in the nasal mucosa. One patch is located in each of the two main compartments of the back of the nose. The olfactory cells are connected to the brain by the first cranial nerve (olfactory nerve). Air currents do not flow directly over the patches in breathing; this is why one must sniff to detect a faint odor or to enjoy a fragrance to the fullest.

When one sniffs, air currents carrying molecules of odorous chemicals enter special compartments, called olfactory chambers, where the chemicals are dissolved in mucus. There they can act on the organs of smell in much the same way that solutions act on the taste buds of the tongue. The endings of the sensory nerves that detect odors, the olfactory receptors, can quickly adapt to an odor and cease to be stimulated by it after a few minutes of full exposure.

The sense of smell may be diminished or lost entirely, usually temporarily, as a result of an obstruction of the nose, nasal infection, injury or deterioration of the nasal tissue, brain tumor, or mental illness. In rare instances, injury or disease causes such damage to the olfactory nerve that loss of the sense of smell is permanent. Complete absence of the sense of smell is known as anosmia.

ol·fac·tion

(ol-fak'shŭn),
1. The sense of smell.
2. The act of smelling.
Synonym(s): osmesis, osphresis
[L. ol- facio, pp. -factus, to smell]

olfaction

/ol·fac·tion/ (ol-fak´shun)
1. smell; the ability to perceive and distinguish odors.
2. the act of perceiving and distinguishing odors.

olfaction

(ŏl-făk′shən, ōl-)
n.
1. The sense of smell.
2. The act or process of smelling.

olfaction

[olfak′shən]
Etymology: L, olfacere, to smell
1 the act of smelling.
2 the sense of smell. olfactory, adj.

ol·fac·tion

(ōl-fak'shŭn)
1. The sense of smell.
Synonym(s): smell (2) .
2. The act of smelling.
Synonym(s): osphresis.
[L. ol-facio, pp. -factus, to smell]

olfaction

The sense of smell or the act of smelling.

olfaction

the sense of smell, in which there is chemoreception of molecules suspended in the air.

olfaction (ōlˑ·fakˈ·shn),

n the sense of smell.

ol·fac·tion

(ōl-fak'shŭn)
1. Sense of smell.
2. Act of smelling.
[L. ol-facio, pp. -factus, to smell]

olfaction (olfak´shən),

n the process of sensing certain odors during basic patient assessment, both intraoral and extraoral, in order to note changes in disease states; simply by detecting certain odors, the dental professional can suspect periodontitis, dental caries, necrotizing periodontal disease, diabetic acidosis, cigarette use, and alcohol abuse.

olfaction

1. the act of smelling.
2. the sense of smell.

Patient discussion about olfaction

Q. I have a very acute sense of smell. Most things that have a smell cause me to have Migraines every day. I have heard that a chiropractor is who I need to treat me for this problem. Anyone else here have this problem? What have you done and were you able to treat it?

A. I can't remember where I heard about the chiropractor's involvement but it is really unpleasant. I tend to make life unpleasant for others to, just not to have a migraine. Things like cooking popcorn, perfumes, trash and many other things will give me a migraine (not a headache) right away. It may be called Hyperosmia (abnormal sense of smell).

Q. MY friends body is leaking and he smells awful. He also has a skin rash. He stinks.Can I help him.He is big. smokes too much,and does shower but he still smells. I need to get him in a chairty hospital. If ignored what will happened. Thank You Bettye

A. HI betty,thank god he has a friend like you--I dont like saying this but,your friend is killing himself,and the sooner you try to get him into a hospital the better--it not going to be easy-but you can only try.At this point he is at risk of LUNG CANCER--A VERY BAD INFECTION--AND CARDIAC ARREST,because of his weight,eating is an addiction,and people die from it,also people die from respiratory arrest because of his weight--stay strong--mrfoot56

More discussions about olfaction
References in periodicals archive ?
Normal olfaction test results scores were [greater than or equal to] 7/12 for veterans younger than 55 yr and [greater than or equal to] 5/12 for veterans 55 yr and older.
It is infrastructural in that it underlies many aspects of olfaction.
Olfaction and cognition: A philosophical and psychoanalytic view.
Supreme Court first engaged the constitutionality of K-9 olfaction.
And mum, whose occasional deference to olfaction is a skoosh of Sure under the armpits on bingo night, will start comparing the subtlety of Chanel with the muskiness of Magie Noir.
The primary taste sensations - mostly from the tongue - remain fairly constant and robust throughout life, but our sensory perception through our nose, called olfaction, often weakens with age, Duffy says.
Now, together with David Howes and Anthony Synnott, she has produced a fine survey of the meanings of olfaction from the historical, anthropological and sociological viewpoint; written in clear prose, synoptic and concise, their text will prove valuable to teachers and students alike.
In October, YCVB won the bid for the 17th International Symposium on Olfaction and Taste that will be held in 2016, and in November Yokohama was chosen as the host for the Goldschmidt Conference in 2016, the leading conference of geochemical community.
The project will be developed in close collaboration between theorists and experimentalists, and is expected to yield an understanding of photosynthesis and olfaction at the most fundamental level, thus contributing in a unique way to such important challenges as the development of more efficient light harvesting technologies or artificial odour sensors.
Olfaction is still largely unexplored terrain and would present a unique opportunity to showcase the cognitive capabilities of their Watson.