Placodes: Difference between revisions
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== References == | |||
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* '''Developmental Biology''' (6th ed.) Gilbert, Scott F. Sunderland (MA): Sinauer Associates, Inc.; c2000. [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=dbio.figgrp.5455%20 Evolution of the mammalian middle ear bones from the reptilian jaw] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=dbio.figgrp.5460 Chick embryo rhombomere neural crest cells] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=dbio.table.3135 Some derivatives of the pharyngeal arches] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=dbio.section.2871 Formation of the Neural Tube] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=dbio.section.2884 Differentiation of the Neural Tube] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=dbio.section.2894 Tissue Architecture of the Central Nervous System] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=dbio.section.2908 Neuronal Types] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=dbio.section.2937 Snapshot Summary: Central Nervous System and Epidermis] | |||
* '''Neuroscience''' Purves, Dale; Augustine, George J.; Fitzpatrick, David; Katz, Lawrence C.; LaMantia, Anthony-Samuel; McNamara, James O.; Williams, S. Mark. Sunderland (MA): Sinauer Associates, Inc. ; c2001 [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=neurosci.chapter.879 The Auditory System] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=neurosci.section.894 The Inner Ear] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=neurosci.section.893 The Middle Ear] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=neurosci.section.891 The External Ear] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=neurosci.chapter.1447 Early Brain Development] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=neurosci.chapter.1546 Construction of Neural Circuits] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=neurosci.chapter.1640 Modification of Brain Circuits as a Result of Experience] | |||
* '''Molecular Biology of the Cell''' (4th Edn) Alberts, Bruce; Johnson, Alexander; Lewis, Julian; Raff, Martin; Roberts, Keith; Walter, Peter. New York: Garland Publishing; 2002. [http://www.ncbi.nlm.nih.gov:80/books/bv.fcgi?db=Books&rid=mboc4.section.3963 Neural Development] | [http://www.ncbi.nlm.nih.gov:80/books/bv.fcgi?db=Books&rid=mboc4.figgrp.3966 The three phases of neural development] | |||
* '''Clinical Methods''' [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=cm.chapter.1949 63. Cranial Nerves IX and X: The Glossopharyngeal and Vagus Nerves] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=cm.chapter.3847 The Tongue] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=cm.chapter.3777 126. The Ear and Auditory System] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=cm.chapter.3627#3654 An Overview of the Head and Neck - Ears and Hearing] | [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=cm.chapter.3897 Audiometry] | |||
* '''Health Services/Technology Assessment Text (HSTAT)''' Bethesda (MD): National Library of Medicine (US), 2003 Oct. [http://www.ncbi.nlm.nih.gov:80/books/bv.fcgi?db=Books&rid=hstat1a.section.25014#25029 Developmental Disorders Associated with Failure to Thrive] | |||
* '''Eurekah Bioscience Collection'''[http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=eurekah.chapter.53006 Cranial Neural Crest and Development of the Head Skeleton] | |||
'''Search Bookshelf''' [http://www.ncbi.nlm.nih.gov/sites/entrez?db=Books&cmd=search&term=placode%20development placode development] | |||
===Reviews=== | |||
<pubmed>9927591</pubmed> | |||
===Articles=== | |||
===Search Pubmed=== | |||
'''Pubmed''' [http://www.ncbi.nlm.nih.gov/sites/gquery?itool=toolbar&cmd=search&term=placode%20development placode development] | |||
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Revision as of 12:24, 21 June 2010
Introduction
Placodes are ectodermal thickenings which have important roles in development of special sensory systems.
In human development, during week 4 a series of thickened surface ectodermal patches form in pairs rostro-caudally in the head region.
Recent research suggests that all sensory placodes may arise from common panplacodal primordium origin around the neural plate, and then differentiate to eventually have different developmental fates. (More? Schlosser G.) These sensory placodes will later contribute key components of each of our special senses (vision, hearing and smell).
Other species have a number of additional placodes which form other sensory structures (fish, lateral line receptor). Note that their initial postion on the developing head is significantly different to their final position in the future sensory system (More? Sensory Notes).
Otic placode- in the stage 13/14 embryo (shown below) the otic placode has sunk from the surface ectoderm to form a hollow epithelial ball, the otocyst, which now lies beneath the surface surrounded by mesenchyme (mesoderm). The epithelia of this ball varies in thickness and has begun to distort, it will eventually form the inner ear membranous labyrinth.
Optic (Lens) placode- lies on the surface, adjacent to the outpocketing of the nervous system (which will for the retina) and will form the lens.
Nasal placode- has 2 components (medial and lateral) and will form the nose olefactory epithelium.
Sensory System
Embryo Week: Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 | Week 9
- Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline
References
Online Textbooks
- Developmental Biology (6th ed.) Gilbert, Scott F. Sunderland (MA): Sinauer Associates, Inc.; c2000. Evolution of the mammalian middle ear bones from the reptilian jaw | Chick embryo rhombomere neural crest cells | Some derivatives of the pharyngeal arches | Formation of the Neural Tube | Differentiation of the Neural Tube | Tissue Architecture of the Central Nervous System | Neuronal Types | Snapshot Summary: Central Nervous System and Epidermis
- Neuroscience Purves, Dale; Augustine, George J.; Fitzpatrick, David; Katz, Lawrence C.; LaMantia, Anthony-Samuel; McNamara, James O.; Williams, S. Mark. Sunderland (MA): Sinauer Associates, Inc. ; c2001 The Auditory System | The Inner Ear | The Middle Ear | The External Ear | Early Brain Development | Construction of Neural Circuits | Modification of Brain Circuits as a Result of Experience
- Molecular Biology of the Cell (4th Edn) Alberts, Bruce; Johnson, Alexander; Lewis, Julian; Raff, Martin; Roberts, Keith; Walter, Peter. New York: Garland Publishing; 2002. Neural Development | The three phases of neural development
- Clinical Methods 63. Cranial Nerves IX and X: The Glossopharyngeal and Vagus Nerves | The Tongue | 126. The Ear and Auditory System | An Overview of the Head and Neck - Ears and Hearing | Audiometry
- Health Services/Technology Assessment Text (HSTAT) Bethesda (MD): National Library of Medicine (US), 2003 Oct. Developmental Disorders Associated with Failure to Thrive
- Eurekah Bioscience CollectionCranial Neural Crest and Development of the Head Skeleton
Search Bookshelf placode development
Reviews
<pubmed>9927591</pubmed>
Articles
Search Pubmed
Pubmed placode development
Glossary Links
- Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link
Cite this page: Hill, M.A. (2024, June 1) Embryology Placodes. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Placodes
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G