NDLI: Structure and growth of the utricular macula in the inner ear of the slider turtle Trachemys scripta.

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Structure and growth of the utricular macula in the inner ear of the slider turtle Trachemys scripta.

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Structure and growth of the utricular macula in the inner ear of the slider turtle Trachemys scripta.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Avall Severinsen, Stig Mørup Jørgensen, Jørgen Randel Nyengaard, Jens
Description	Country affiliation: Denmark Author Affiliation: Avall Severinsen S ( Stereological Research Laboratory, University of Aarhus, DK-8000 Aarhus C, Denmark. stig.severinsen@IEKF.AU.DK)
Abstract	In general, postembryonic production of inner ear vestibular hair cells (HCs) is believed to occur in all nonmammalian vertebrates. However, no study on this topic has been published on reptiles and, consequently, it is not known whether this also applies to these vertebrates. Therefore, the present study applied stereological methods in order to estimate the total number of HCs in turtles of varying sizes. The findings are that in prehatchlings the utricular macula (UM) contains approximately 4000 HCs as compared to approximately 5000 in juveniles, approximately 8000 in medium-sized turtles, and approximately 12,000 in large, sexually mature turtles. Scanning electron microscopy (SEM) reveals that presumably newly generated HCs with small surface areas and thin stereovilli are found in all regions of the UM. Furthermore, it reveals that utricular HCs can be classified as belonging to a specific region from the morphology of their apical structure. Striolar HCs have a large free oval-to-ovoid surface, a hair bundle with numerous stereovilli, and a short kinocilium. Rampary and cotillary HCs have smaller and slimmer free surfaces, comparatively fewer stereovilli, but much longer kinocilia. In conclusion, the current study demonstrates that postembryonic production of HCs does occur in reptiles and thereby supports the general view that this is a common trait in all nonmammalian vertebrates.
File Format	HTM / HTML
ISSN	15253961
e-ISSN	14387573
Journal	Journal of the Association for Research in Otolaryngology
Issue Number	4
Volume Number	4
Language	English
Publisher	Springer
Publisher Date	2003-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Otolaryngology Saccule And Utricle Cytology Growth & Development Turtles Anatomy & Histology Animals Cell Division Hair Cells, Auditory Ultrastructure Microscopy, Electron, Scanning Models, Biological Embryology Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Otorhinolaryngology Sensory Systems

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