olfacto-, olfact- +

A smelling organ; such as, a nose.

A reference to olfaction, or the sense of smell.

The absence, or loss, of the sense of smell.

1. The sensory area for olfaction lying in the hippocampal gyrus of the brain.
2. The area of nasal mucosa in which the olfactory organ is situated.

A region at the base of the brain through which numerous small branches of the anterior and middle cerebral arteries (lenticulostriate arteries) enter the depth of the cerebral hemisphere.

It is bordered medially by the optic chasm and anterior half of the optic tract, rostrally and laterally by the lateral olfactory stria; its anteromedial part corresponds to the olfactory tubercle.

A sudden disagreeable sensation of smell, or odor, preceding or characterizing an epileptic attack

1. One of two enlargements at the terminus of the olfactory nerve at the base of the brain just above the nasal cavities.
2. A key part of the olfactory apparatus consisting of a bulbous enlargement of the end of the olfactory nerve on the under surface of the frontal lobe of each cerebral hemisphere of the brain just above the nasal cavity.

In the embryo, the nasal cavities at an early period of development.

Smell disorders which include a loss of the ability to smell or a change in the way odors are perceived.

Reduction of the sense of smell is termed hyposmia. Total inability to detect odors is termed anosmia.

As for changes in the perception of odors, some people notice that familiar odors become distorted, or an odor that usually smells pleasant instead smells foul. Still other people may perceive a smell that is not present which is called "olfactory hallucination" and it is one that involves the sense of smell.

Smell disorders have many causes. Most people who develop a smell disorder have recently experienced an illness or an injury. Common triggers for smell disorders are colds and other upper respiratory infections and head injuries.

Among other causes of smell disorders are polyps in the nasal cavities, sinus infections, hormonal disturbances, or dental problems. Exposure to certain chemicals; such as, insecticides and solvents, and some medications have also been associated with smell disorders.

People with head and neck cancers who receive radiation treatment are also among those who experience problems with their sense of smell.

Olfactory disorders can have serious consequences; for example, the sense of smell often serves as a first warning signal, alerting us to the smoke of a fire or the odor of a natural gas leak and dangerous fumes.

Perhaps more important is that our chemosenses are sometimes a signal of serious health problems. Obesity, diabetes, hypertension, malnutrition, Parkinson's disease, Alzheimer's disease, multiple sclerosis, and alcoholic psychosis are all accompanied or are signaled by chemosensory problems; such as, olfactory disorders.

A slowly growing malignant tumor of the nasal fossa (an anatomical depression), developing from epithelial (outside layer of cells) and neural tissues of the olfactory mucosa.

Any of the nerves supplying the nasal olfactory mucosa.

These nerves consist of delicate bundles of unmyelinated fibers (fila olfactoria) that pass through cribriform plate and terminate in olfactory glomeruli of olfactoryi bulb.

The fila are central processes of bipolar receptor neurons of olfactory mucous membrane.

Sensory neurons from the lining of the nose.

They are the only neurons that continue to divide and differentiate throughout an organisms life.

The organ involved in the detection of smells, which consists of a group of sensory receptors that respond to air-borne or water-borne chemicals.

Vertebrates possess a pair of olfactory organs in the mucous membrane lining the upper part of the nose, which opens to the exterior via the external nares (nostrils).

Chemicals from the environment are dissolved in the mucus secreted by the nasal epithelium and information is transmitted to the brain by the receptors via the olfactory nerve.

Olfactory organs are found on the antennae in insects and in various positions in other invertebrates.

The specialized olfactory receptive area that includes the upper one-third of the nasal septum and the lateral wall above the superior concha and is lined with olfactory mucosa.

A reference to olfaction, or descriptive of the sense of smell.