Station 2 Flashcards
Where is the olfactory mucosa located?
Superiormost region of the nasal cavity
What is the olfactory epithelium?
Pseudostratified ciliated columnar epitheium with Olfactory receptor neurons (bipolar neurons), and NO goblet cells
Nuclei of ciliated columnar cells appears more organised than respiratory epithelium
Cells include: Olfactory cells (bipolar neurons) Supporting cells (provide mechanical and metabolic support for olfactory cells, apically located nuclei) Basal cells (stem cells) Brush cells (general sensory - other than olfaction)
In Submucosa = Bowman’s Glands. Produce serous secretions that constantly trap and wash away odorants
What is a Bowman’s Gland? Function? Structure? Where are they found?
Found in submucosa of olfactory epithelium.
Produce serous secretions that constantly trap and wash away odorants
Tubuloalveolar serous gland
Describe the bipolar neurons
Have immotile cilia which express olfactory receptors, located on their apical dendrite
Where do the olfactory neurons go from the olfactory epithelium?
Cell bodies are in the olfactory epithelium, the axons pass superiorly, through the olfactory foramina of the cribriform plate of the ethmoid bone. The axons bundle together forming the olfactory nerve (CNI)
Which cranial nerve. and which two divisions of it, convey general (non-olfactory) sensory information from nasal cavity to CNS?
Trigimenal Nerve (CN V), chiefly the Maxillary Division (CN V2), and also the Ophthalmic Division (CN V1) - convey pain, temp, touch, etc
Which cranial nerve conveys preganglionic axons from the CNS to the pterygopalatine ganglion, where they synapse>
What types of fibres will stimulate secretion from the serous mucous glands in the nasal cavity?
Facial Nerve (CN VII)
Carries Parasympathetic Fibres which stimulate mucosal gland secretions
Travels with the general sensory nerves in the nasal cavity to innervate the nasal cavity glands
