NURS 106 Lecture Notes - Lecture 22: Olfactory Receptor, Olfactory Mucosa, Olfactory Bulb
30 Oct 2018
School
Department
Course
Professor
Document Summary
*olfactory is the only sensory information that reaches the cerebral cortex directly. Olfactory receptors in the nose nose and afferent axon transverses into brain. 3 cm squared of mucosa ceiling of nasal cavity, containing 3 cell types. Afferent neuron whose receptor portion is in olfactory mucosa in. Collectively formed olfactory receptor cells (supporting cells, basal cells) Receptors are specialized endings of renewable afferent neurons. Precursors of new olfactory cells (replaced every 2 months) Olfactory receptors olfactory bulb olfactory tract. To be smelled substances must be sufficiently volatile that some of its molecules can enter the nose, or sufficiently water soluble that it can be dissolved in the mucous coating hte olfactory mucosa. Odorants act through second-messenger systems to trigger action potentials. Afferent signals are sorted according to scent component by glomeruli within olfactory bulb. Taste buds have receptor cells packaged with supporting cells. Taste receptors have a lifespan of 10 days taste pore .
