Our Chemical Senses Flashcards
(18 cards)
What are the 2 types of relay neurons in olfaction?
Mitral
Tufted
What are periglomerular cells?
GABAergic interneurons
May serve to modify incoming signals
Connections with olfactory sensory neurons and mitral/tufted relay neurons
What are granule cells?
GABAergic interneurons, inhibit mitral/tufted relay neurons
What are the 5 major areas of the olfactory cortex?
Anterior olfactory nucleus Anterior/posterior cortical nuclei or amygdala Olfactory tubercle Entorhinal cortex Piriform cortex
NTS is associated with which sense?
Gustation
What nerves transmit taste?
Glossopharyngeal and chorda tympani (facial nerve)
Name of the glossopharyngeal nerve ganglion
Geniculate
Name of the facial nerve ganglion
Petrosal
What are the 3 types of taste buds?
Fungiform
Foliate
Circumvallate
Where are circumvallate papillae and what is their innervation?
Posterior 1/3 of tongue
Glossopharyngeal nerve
Where are the foliate papillae and what is their innervation?
Posterior edge of tongue
Chorda tympani nerve (VII) and lingual branch of trigeminal (V)
Where are the fungiform papillae and what is their innervation?
Anterior 2/3 tongue
Chorda tympani nerve (VII) and lingual trigeminal (V)
Which taste buds are largely responsible for sweet taste?
Circumvallate and foliate
Which taste buds are largely responsible for umami taste?
Fungiform
Which taste buds are largely responsible for bitter taste?
Circumvallate and foliate
Flavour is dependent on a combination of…
Taste, oral somatosensation and retronasal olfaction
How are salty and acidic tastes thought to be different from sweet, umami and bitter tastes?
Ion channels (proposed) compared to receptors
Where is the taste information conveyed to from the thalamus?
Hypothalamus, gustatory cortex, primary somatosensory cortex, amygdala
