| olfactory bundle | A fibre system, described by E. Zuckerkandl as "Reichbundel," descending from the transparent septum in front of the anterior commissure toward the base of the forebrain; it contains precommissural fibres of the fornix, fibres from the septum to the hypothalamus and innominate substance, as well as fibres ascending to the septum and hippocampus from the hypothalamus and midbrain; it bears no special relation to the sense of smell. (05 Mar 2000) |
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| olfactory cells | Very slender nerve cell's, with large nuclei and surmounted by six to eight long, sensitive cilia in the olfactory epithelium at the roof of the nose; they are the receptors for smell. Synonym: olfactory cells, Schultze's cells. (05 Mar 2000) |
| olfactory cortex | The olfactory cortex, corresponding to the rostral half of the uncus; receiving its major afferents from the olfactory bulb, it is classified as allocortex. See: cerebral cortex. Synonym: olfactory cortex, piriform area. (05 Mar 2000) |
| olfactory epithelium | The epithelium lining the nose. (18 Nov 1997) |
| olfactory esthesioneuroblastoma | <tumour> A rare, often slowly growing malignant tumour of primitive nerve cells, usually arising in the olfactory area of the nasal cavity. Synonym: olfactory esthesioneuroblastoma. (05 Mar 2000) |
| olfactory fila | Collective term denoting the numerous olfactory filaments: slender fascicles each composed of the thin, unmyelinated axons of 8 to 12 of the bipolar olfactory receptor cells in the olfactory portion of the nasal mucosa; the olfactory filaments pass through the cribriform plate of the ethmoid bone and enter the olfactory bulb, where they terminate in synaptic contact with mitral cells, tufted cells, and granule cells. See: olfactory tract. Synonym: nervi olfactorii, fila olfactoria, first cranial nerve, nerve of smell, olfactory fila. (05 Mar 2000) |
| olfactory foramen | One of the openings in the cribriform plate of the ethmoid bone, transmitting the olfactory nerves. (05 Mar 2000) |
| olfactory glands | Branched tubuloalveolar serous secreting glands (of Bowman) in the mucous membrane of the olfactory region of the nasal cavity. Synonym: glandulae olfactoriae. (05 Mar 2000) |
| olfactory glomerulus | One of the small spherical territories in the olfactory bulb in which dendrites of mitral and tufted cells synapse with axons of olfactory receptor cells. (05 Mar 2000) |
| olfactory groove | The sagittal sulcus on the inferior or orbital surface of each frontal lobe of the cerebrum, demarcating the straight gyrus from the orbital gyri, and covered on the orbital surface by the olfactory bulb and tract. Synonym: sulcus olfactorius, olfactory groove. (05 Mar 2000) |
| olfactory hallucination | False perception in smell. (05 Mar 2000) |
| olfactory hyperesthesia | An exaggerated or abnormally acute sense of smell. Synonym: hyperosphresia, hyperosphresis, olfactory hyperesthesia, hyperesthesia olfactoria, oxyosmia, oxyosphresia. Origin: hyper-+ G. Osme, sense of smell (05 Mar 2000) |
| olfactory hypesthesia | Diminished sense of smell. Synonym: hyposphresia, olfactory hypesthesia. Origin: hypo-+ G. Osme, smell (05 Mar 2000) |
| olfactory membrane | That part of the nasal mucosa having olfactory receptor cells and glands of Bowman. (05 Mar 2000) |
| olfactory mucosa | That portion of the nasal mucosa containing the sensory endings for olfaction; the organ of smell. (12 Dec 1998) |