The level of spontaneous myogenic tone in isolated human posterior ciliary arteries decreases with age.

The spontaneous myogenic activity of rings of human posterior ciliary arteries was studied in vitro. All arteries from six patients had an intrinsic myogenic tone, which was dependent on extracellular calcium and inversely correlated with age. The myogenic tone was stable without rhythmic variations, except in one artery. The level of spontaneous myogenic… CONTINUE READING