Physiological and anatomical studies of the development of the sympathetic innervation to rat iris arterioles

1999 ◽  
Vol 77 (2-3) ◽  
pp. 152-163 ◽  
Author(s):  
Shaun L Sandow ◽  
Caryl E Hill
Keyword(s):  
Sympathetic Innervation ◽  
Anatomical Studies ◽  
Rat Iris

scholarly journals Studies on the regulation of beta-nerve growth factor gene expression in the rat iris: the level of mRNA-encoding nerve growth factor is increased in irises placed in explant cultures in vitro, but not in irises deprived of sensory or sympathetic innervation in vivo.

1986 ◽  
Vol 102 (5) ◽  
pp. 1940-1948 ◽  
Author(s):  
D L Shelton ◽  
L F Reichardt
Keyword(s):  
Nerve Growth Factor ◽  
Growth Factor ◽  
Sympathetic Innervation ◽  
Sensory Innervation ◽  
Surgical Removal ◽  
Mrna Levels ◽  
Nerve Growth ◽  
Rat Iris

Beta-nerve growth factor (NGF) is a protein necessary for the survival and maintenance of sympathetic and sensory neurons that appears to be produced by the target tissues of these neurons in vivo. Both denervation and the culture of explants of one model target, the rat iris, leads to an increase in the NGF content, suggesting that innervating neurons may regulate a step in synthesis or turnover of NGF. To determine whether there is a change in synthesis controlled at the mRNA level, the rat iris has been assayed for its content of NGF mRNA after surgical and chemical denervation and after explant into culture. Using a sensitive blot hybridization assay, a large, rapid increase in the content of NGF mRNA was observed upon explant of the rat iris. The increase was readily detectable within 1 h, reached a maximum increase of 10- to 20-fold by 6 to 12 h, and was still evident after 3 d in culture. The distribution of NGF mRNA in different areas of the iris does not change during this time. This rapid increase in NGF mRNA is also seen in the fully innervated iris in vivo after trauma to the anterior chamber. In contrast, denervation to varying degrees in situ had no effect on NGF mRNA levels. Neither removal of sympathetic innervation by surgical or chemical methods nor combined surgical removal of sympathetic and sensory innervation detectably altered NGF mRNA content. Thus, denervation of the rat iris in situ does not cause the observed accumulation of NGF by increasing the level of NGF mRNA, and the increase in NGF content must be due to other factors.

Ultrastructure of the soil fungus, Geomyces pannorus

1984 ◽  
Vol 42 ◽  
pp. 738-739
Author(s):  
J. A. Traquair ◽  
E. G. Kokko
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fine Structure ◽  
Low Temperatures ◽  
Soil Fungus ◽  
Organic Soils ◽  
Anatomical Studies ◽  
Transmission Electron ◽  
Electron Microscopical ◽  
Scanning Electron

With the advent of improved dehydration techniques, scanning electron microscopy has become routine in anatomical studies of fungi. Fine structure of hyphae and spore surfaces has been illustrated for many hyphomycetes, and yet, the ultrastructure of the ubiquitous soil fungus, Geomyces pannorus (Link) Sigler & Carmichael has been neglected. This presentation shows that scanning and transmission electron microscopical data must be correlated in resolving septal structure and conidial release in G. pannorus.Although it is reported to be cellulolytic but not keratinolytic, G. pannorus is found on human skin, animals, birds, mushrooms, dung, roots, and frozen meat in addition to various organic soils. In fact, it readily adapts to growth at low temperatures.

An ultrastructural analysis of the sympathetic innervation of the rabbit ear artery and middle cerebral artery and their branches

1992 ◽  
Vol 50 (1) ◽  
pp. 934-935
Author(s):  
John T. Dodge ◽  
John A. Bevan
Keyword(s):  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Sympathetic Innervation ◽  
Electrical Field Stimulation ◽  
Rabbit Ear Artery ◽  
Electrical Field ◽  
Functional Differences ◽  
Ear Artery ◽  
Rabbit Ear ◽  
Vascular Beds

Unlike many peripheral vascular beds, the sympathetic nervous system exerts little control on cerebral blood flow. The contractile response of isolated rabbit middle cerebral artery (MCA) segments to electrical field stimulation of its intramural nerves is less than in a similar-sized artery from the ear. This study was undertaken to characterize and compare the perivascular neuromuscular relationships and innervation density of similar-sized arteries varying in diameter from these two different regional arterial beds to see if there were structural correlates for these functional differences.

Supraspinatus and Infraspinatus Tendon Tears: New Insights from Recent Anatomical Studies

2019 ◽  
Author(s):  
M. Tuite ◽  
A. U. Patel ◽  
T. Scerpella ◽  
B. Chan ◽  
G. Baer ◽  
...  
Keyword(s):  
Anatomical Studies ◽  
Tendon Tears ◽  
Infraspinatus Tendon

216-OR: O-GlcNAc Transferase in the Ventromedial Hypothalamus Regulates Lipid Metabolism through Fat Depot–Specific Sympathetic Innervation

Diabetes ◽  
2020 ◽  
Vol 69 (Supplement 1) ◽  
pp. 216-OR
Author(s):  
QI WANG ◽  
BICHEN ZHANG ◽  
YUNFAN YANG ◽  
JIA MI ◽  
GENG TIAN ◽  
...  
Keyword(s):  
Lipid Metabolism ◽  
Sympathetic Innervation ◽  
Ventromedial Hypothalamus ◽  
Fat Depot ◽  
Glcnac Transferase
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