Sensory - Taste Development: Difference between revisions
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Revision as of 06:27, 6 October 2011
Introduction
These notes introduce the development of the sense of taste which can divided into five basic tastes: bitter, salty, sweet, umami (savoury) and sour. Current research appears to have displaced the historic concept of a tongue "map".
A study in rat suggests that neonatal changes in circumvallate papillae may result in postnatal changes in "taste".[3] In frogs, a large taste disc (TD) is the largest vertebrate gustatory organ. Postnatally, the sense of taste is also closely related to the sense of smell.
Taste Links: Introduction | Student project | Tongue Development | Category:Taste | ||
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Senses Links: Introduction | placode | Hearing and Balance hearing | balance | vision | smell | taste | touch | Stage 22 | Category:Sensory |
Some Recent Findings
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Development Timing
These are human embryonic timings[6], not clinical which is based on last menstral period +2 weeks.
Week 6 - gustatory papilla, caudal midline near the foramen caecum
Week 6-7 - nerve fibers approach the lingual epithelium
Week 8 - nerves penetrate epitheilai basal lamina and synapse with undifferentiated, elongated, epithelial cells (taste bud progenitor cell)
Week 10 - shallow grooves above the taste bud primordium
Week 12 - first differentiated epithelial cells (Type II and III)
Week 12 -13 - maximum synapses between cells and afferent nerve fibers
Week 14 - 15 - taste pores develop, mucous
Week 18 - substance P detected in dermal papillae, not in taste bud primordia
3rd Trimester -
Tongue Development
Gustatory cranial sensory neurons
Cranial nerves VII, IX and X have dual embryonic origins and provide both gustatory (taste) and non-gustatory (touch, pain, temperature) sensory innervation to the oral cavity of vertebrates.
Gustatory Neurons
- originate from epibranchial placodes
- innervate taste buds
- project centrally to the rostral nucleus of the solitary tract (NTS)
General Epithelial Innervation of the oral cavity
- originate from cranial neural crest
- innervation to the oropharynx
- project to non-gustatory hindbrain regions (spinal trigeminal nucleus)
(text based on: Embryonic origin of gustatory cranial sensory neurons.[7])
Stage 22
Section (B4) through head showing tongue and head structures.
References
- ↑ <pubmed>17108952</pubmed>
- ↑ <pubmed>17903280</pubmed>
- ↑ <pubmed>11474141</pubmed>
- ↑ <pubmed>21655085</pubmed>| PMC3107195 | http://www.plosgenetics.org/article/info%3Adoi%2F10.1371%2Fjournal.pgen.1002098 PLoS Genetics]
- ↑ <pubmed>19363153</pubmed>
- ↑ <pubmed>8955790</pubmed>
- ↑ <pubmed>17826760</pubmed>
Reviews
<pubmed>21184814</pubmed> <pubmed>20696704</pubmed>| JCB
Articles
Search PubMed
Search May 2010
- Taste System Development - All (320) Review (64) Free Full Text (78)
- Tongue Development - All (2804) Review (258) Free Full Text (519)
Search Pubmed: Taste System Development | Tongue Development
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Cite this page: Hill, M.A. (2024, June 17) Embryology Sensory - Taste Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Sensory_-_Taste_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G