Document Detail


Mammalian neural crest and neural crest derivatives.
MedLine Citation:
PMID:  8297038     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In the mammalian embryonic trunk, neural crest cells emigrate from the closed neural tube in a cranio-caudal sequences and appear to have similar migration pathways and derivatives to those of avian embryos. In the cranial region, however, there are mammalian-specific features, which are related to the mammalian-specific pattern of cranial neurulation. Midbrain and rostral hindbrain neural crest cells emigrate from widely open neural folds; caudal hindbrain crest emigrates in a caudo-rostral sequence, following the sequence of neural tube closure in this region. The forebrain is also a source of neural crest cells at early stages of neurulation; both forebrain and midbrain crest cells contribute to the frontonasal mesenchyme, although their relative contributions have not been analysed. Few studies have provided direct information about mammalian neural crest cell derivatives. Studies on the effects of retinoid excess on craniofacial development provide indirect evidence that mammalian cranial neural crest, like that of avian embryos, includes two populations whose differentiated phenotype and morphological tissue structure are determined prior to emigration. Retinoid-induced shortening of the preotic hindbrain leads to abnormal migration pathways of the neural crest cells that normally migrate into the mandibular arch to form Meckel's cartilage, so that an ectopic Meckel's cartilage-like structure forms in the maxillary region of the face. Slow descent of the heart in retinoid-exposed embryos enables the "wrong" crest cell population to populate the wall of the truncus arteriosus. These observations correlate well with observations of retinoid-induced craniofacial and heart abnormalities in human infants.
Authors:
G Morriss-Kay; E Ruberte; Y Fukiishi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft     Volume:  175     ISSN:  0940-9602     ISO Abbreviation:  Ann. Anat.     Publication Date:  1993 Dec 
Date Detail:
Created Date:  1994-02-25     Completed Date:  1994-02-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100963897     Medline TA:  Ann Anat     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  501-7     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Cell Movement
Embryonic and Fetal Development
Mammals / anatomy & histology*
Neural Crest / anatomy & histology*,  cytology,  physiology*
Prosencephalon / embryology
Rats

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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