Whilst reservations here primarily concern epithelial cells prepared from the oviduct ampulla, corresponding reservations would apply to epithelial cells from the isthmus.
Position of nerve ring, 0.396 - 0.440 from anterior end, just posterior to corpus, indicated by cluster of ganglia surrounding proximal margin of isthmus.
Flow in the descending aorta just distal to the ductus arteriosus/aortic isthmus junction shows definite temporal differences and two distinct streams.
Increased nuchal translucency in trisomy 21 fetuses; relation to narrowing of the aortic isthmus.
However, its application, safety, and efficacy in the setting of mild hypoplasia of the aortic isthmus has not been determined.
The skin and bone above the tectum were opened to allow access to the nucleus isthmi, which lies below the tectum at its caudal pole.
When shedding of the oocyte(s) into the ampulla is imminent, stored spermatozoa are activated and released from the caudal isthmus in discrete numbers.
Stimulation of the nucleus isthmi leads to time-varying electrical potentials in the optic tectum.
