Flashcards in Nasal + Oral Cavity Deck (24):
Nasal cavity: gross anatomy
olfactory chemoreceptors in olfactory epithelium --> cribiform plate --> olfactory bulb --> limbic system
types of cells in the olfactory epithelia (3)
olfactory chemoreceptors, support cells, basal cells
molecular mechanism of smell
odourant --> GPCR --> up adenyl cyclase/cAMP --> open Na channel
nasal cavity consists of both what kinds of epithelia?
olfactory + respiratory epithelia
name the cells in the respiratory epithelia (5)
cilliated pseudostrat columnar epithelial cells, goblet cells, basal cells, brush cells, K cells
name the parts of the oral cavity (5)
oral epithelium, tongue, tonsils, teeth, salivary glands
name the features of the lip slide (oral epithelium). Name the 3 zones and their epithelial characteristics
exterior (will see hair follicles, sebaceous glands + keratinized simple squamous epith).
vermillion zone (will see transition bw keratinzed simple squamous epith --> nonkeratinzed simple squamous epith. This area has no sebaceous or sweat glands -- chaps easily)
interior (nonkerat simple squamous epithelia, minor salivary glands) Note that the middle has skeletal muscle
The tongue is a bag of muscles covered in oral epithelium + papillae. Name the 3 types of papilae and their features
1) filiform (most common, spiky looking, keratinized (grey/white), helps move food along)
2) fungiform (rounder, well vascularized/innervated, lightly keratinized)
3) circumvallate (8-10 along the sulcus terminals. responsible for taste. V large, circular papillae with a deep groove/"moat". On the side of the papillae are VON EBNER'S GLANDS which secrete SEROUS MUCUS into the groove. This dissolves tastants, for the TASTE BUDS on the side of the papillae to detect (can only detect AQUEOUS things)
describe the histology of a taste bud
consists of a taste pore opening into a series of TASTE HAIR CELLS, SUPPORT CELLS, BASAL CELLS , and innervated by an afferent nerve fibre
what kind of tissue are tonsils?
name the 2 tonsils we are responsible for knowing
palatine (back of throat) and pharengeal (up in nasopharynx)
slide of a palatine tonsil - what are its distinguishing characteristics?
1) dense CT capsule with CRYPTS
2) covered in oral epithelium (nonkerat simple squamous)
3) contain LYMPHATIC NODULES (pale blobs) which contain IMMATURE, DIVIDING B CELL LYMPHOCYTES
Name the gross anatomy layers of a tooth (3+1)
1) enamel, 2) dentin, 3) pulp, 4) roots
what 2 things hold a tooth in place?
cementum + periodontal ligament (hold dentin root --> bone)
histological layers of an erupting tooth (from out to in)
ameloblast, enamel, dentin, predentin, odontoblast, pulp
what secretes what in a tooth? ie logic to the layers
ameloblasts secrete enamel, odontoblasts secrete predentin, which matures into dentin (leaving dentin tubules which form from odontoblast processes)
what makes cementum
what is enamel made of? wha tproteins are invlved in enamel formation
what is dentin made of
collagen + hydroxypatite
name the 3 salivary glands
parotid, sublingual, submandibular
what secretes what kind of saliva?
parotid secretes serous saliva (w/ amylase)
sublingual secretes seromucus (mostly mucus) saliva w/ lysozyme
submandibular secretes seromucus saliva
describe the path of saliva (5)
secreted by serous/mucus epithelial cells --> acini --> secretory tubules --> intercalated duct (cuboidal epithelium) --> stirated duct (columnar epithelium w/ basal membrane infoldings) --> excretory duct
note that the acinus is covered in myoepithelial cells
how to distinguish bw serous and mucous ducts?
serous: pink, pyramidal, pizza shaped, found in acini
mucus: pale, pizza shaped, larger duct lumen, found in tubules