Flashcards in Taste buds and stuf Deck (50)
What part of the tongue has specialized mucosa?
Body of the tongue
Root of the tongue
Divides the anterior and posterior portions of the tongue
What type of epithelium covers the tongue
What give the tongue its rough surface?
What CN inneervate the taste buds?
VII, IX, X
What provides touch sensory to the tongue?
What innervates warming sensation of the tongue
What innervates cooling sensation of the tongue?
What provides pain sensation of the tongue
A-delta and C-fibers
What provides somatosensory innervations of the anterior tongue?
What provides somatosensory innervation to the posterior of the tongue
Large (A-beta) axons that terminate in the superficial lamina propria between rete pegs
Which nerves are "rapidly adapting"? what does that mean?
Respond only to the changing aspects of the stimulus - mechanically sensitive receptors are embedded in the nerve fiber endings
Which nerves are "slowly adapting"? What does that mean?
Respond both to the changing aspects and static phases of stimulus
In Merkel endings, where does the initial firing come form, and where does the continued firing come form?
Initial firing comes from activation of the receptors in the nerve fiber itself
Sustained firing comes from activation of receptors in the Merkel cell which communicates synaptically with the associated fiber
Free nerve endings that sense pain
Merkel endings and Meissner corpuscles can't code for nosxious sensations
What are some things taste can detect/distinguish?
Can distinguish nutritive v non-nutritive substances
Can distinguish nutrients
Can detect harmful substances
What are the 5 classes of taste reception?
Sugars - sweet
Amino acids - umami
Salts - salty
Acids - sour
Varied - bitter
T/F - Sensations of spiciness is dependent of taste system
False - dependent on the pain system - TRP receptors
How many cells in a taste bud? How are these cells oriented
90 degrees to the rest of the epithelium
What cellular structure are taste receptors located?
Opening to keratinized layer to let things diffuse and be sensed by microvilli
Lateral to the microvilli
T/F - Taste buds are only on the tongue
False - they are mostly on the tongue, but there are some in the pharynx and soft palate
Fungiform papillae shape
What innervates fungiform papillae?
Chorda tympani branch of VII
-They arise from arch I, but the innervation arises from arch II
Where are fungiform papillae located?
On the dorsal anterior tongue, among more numerous filliform papillae
Do not contain taste buds
Innervated by sommatosensory only