๐ค Olfactory receptors1️⃣ are the most important cells of the olfactory epithelium and they are the first order neurons of the cranial nerve I
๐คThere are approximately 100 million such receptors in the olfactory epithelium found along the roof of the nasal cavity including the superior and upper middle conchae
๐คOlfactory receptors project through the cribiform plate in the ethmoid bone
๐คThey have multiple cilia immersed in a surrounding matrix of mucus and a long dendrite
๐คOdiferous chemicals get dissolved in this mucus and then trigger the olfactory receptors
๐คThe impulses pass through the neuron to the olfactory bulb (lies in base of frontal cortex in anterior fossa), which has projections to cortical areas
๐คThe primary olfactory area in the temporal lobe process such informations through it's connections with the hypothalamus, thalamus and frontal cortex
๐คThe other major cell type is basal cells2️⃣ found deep to the olfactory neurons (olfactory neurons have a half-life of one month) and replace them, as they mature
๐ค3️⃣Sustentacular or supporting cells constitute the columnar mucus epithelium found between the receptors
๐คThere are 4️⃣Olfactory (Bowman’s) glands found in the connective tissue beneath the olfactory epithelium which produce the mucus in which the odiferous chemicals dissolve
❓➡️ ๐ ฐ️ Finally answer to the question
๐คThe innervation of the olfactory epithelial cells from cranial nerve VII (facial nerve) explains the tears and sniffing evoked by some smells.
Reference: Tortora GJ, Grabowski SR. Principles of Anatomy and Physiology, 8th edn. New York, NY: HarperCollins, 1996; pp. 454–5
#smell , #Olfaction , #PhysiologyForExams , #NeuroAnatomy , #anesthesiology
๐คThere are approximately 100 million such receptors in the olfactory epithelium found along the roof of the nasal cavity including the superior and upper middle conchae
๐คOlfactory receptors project through the cribiform plate in the ethmoid bone
๐คThey have multiple cilia immersed in a surrounding matrix of mucus and a long dendrite
๐คOdiferous chemicals get dissolved in this mucus and then trigger the olfactory receptors
๐คThe impulses pass through the neuron to the olfactory bulb (lies in base of frontal cortex in anterior fossa), which has projections to cortical areas
๐คThe primary olfactory area in the temporal lobe process such informations through it's connections with the hypothalamus, thalamus and frontal cortex
๐คThe other major cell type is basal cells2️⃣ found deep to the olfactory neurons (olfactory neurons have a half-life of one month) and replace them, as they mature
๐ค3️⃣Sustentacular or supporting cells constitute the columnar mucus epithelium found between the receptors
๐คThere are 4️⃣Olfactory (Bowman’s) glands found in the connective tissue beneath the olfactory epithelium which produce the mucus in which the odiferous chemicals dissolve
❓➡️ ๐ ฐ️ Finally answer to the question
๐คThe innervation of the olfactory epithelial cells from cranial nerve VII (facial nerve) explains the tears and sniffing evoked by some smells.
Reference: Tortora GJ, Grabowski SR. Principles of Anatomy and Physiology, 8th edn. New York, NY: HarperCollins, 1996; pp. 454–5
#smell , #Olfaction , #PhysiologyForExams , #NeuroAnatomy , #anesthesiology
