Document Detail


Elastic fibers in the rat exorbital lacrimal gland duct system.
MedLine Citation:
PMID:  2777519     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In the rat, each paired subcutaneous exorbital lacrimal gland overlies the retromandibular area. The fibrous cord containing its ducts passes over the masticatory muscles to the temporal canthus. Thus, the lacrimal system must accomodate both jaw and lid movements. To see whether elastic fibers exist to modulate alterations in tension caused by such movements, light and electron micrographs were made of its duct system. The innermost elastic fibers are connected by elaunin fibrils and oxytalan microfibrils to the lamina densa, particularly near the hemidesmosomes. The innermost elastic fibers appear to be longitudinal and about 0.2 micron from the lamina densa. Circumferential fibers exist about 0.8-3.2 microns from that structure. More peripheral fibers of both orientations also exist. Light microscopy of the extraglandular duct demonstrated circumferential fibers near the basement membrane and longitudinal and angular elastic fibers amid the collagenous layers. Some of the longitudinal fibers assume a loose cross-weave. Intraglandularly, as duct size diminishes elastic fibers progressively decrease in number and size until the smallest ducts have none. Thus, an elastic gradient exists. It is believed that recoil of the angular elastic fibers aids distension of the large and medium ducts when secretion is great and that recoil of the circumferential ones permits those duct diameters to diminish when secretion does. The longitudinal elastic fibers would allow all but the smallest ducts to recoil from the stretching of much of the exorbital lacrimal duct system accompanying blinking and other facial movements.
Authors:
M Lorber
Related Documents :
20372599 - Modal interferometer based on hollow-core photonic crystal fiber for strain and tempera...
2509479 - Analysis of the bending behaviour of porcine xenograft leaflets and of natural aortic v...
23187469 - Design of led fish lighting attractors using horizontal/vertical lidc mapping method.
18059889 - Electrostrictive response in single-mode ring-index-profile fibers.
2777519 - Elastic fibers in the rat exorbital lacrimal gland duct system.
15734489 - Anisotropy of human linea alba: a biomechanical study.
2635459 - Isolation of scotopic human electroretinograms using color adaptation and pattern rever...
25474329 - Access resistance of stimulation electrodes as a function of electrode proximity to the...
25398179 - Learning templates for artistic portrait lighting analysis.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  30     ISSN:  0146-0404     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  1989 Sep 
Date Detail:
Created Date:  1989-10-19     Completed Date:  1989-10-19     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2002-11     Citation Subset:  IM    
Affiliation:
Department of Physiology and Biophysics, Georgetown University School of Medicine, Washington, DC 20007.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Animals
Elastic Tissue / anatomy & histology*,  ultrastructure
Female
Lacrimal Apparatus / anatomy & histology*,  ultrastructure
Male
Microscopy, Electron
Rats

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


Previous Document:  Role of spherical aberration in contrast sensitivity loss with radial keratotomy.
Next Document:  Different patterns of retinal correspondence in the central and peripheral visual field of strabismi...