See Also: standard limb lead(medicine)
Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
cloaca(encyclopedia)
cloaca(dictionary)
Cloaca(health)
cloaca(medicine)
endodermal cloaca(medicine)
ectodermal cloaca(medicine)
persistent cloaca(medicine)
exstrophy of the cloaca(medicine)

standard limb lead (medicine) and cloaca (sh)


standard limb lead (medicine)


standard limb lead


One of the three original bipolar limb lead's of the clinical electrocardiogram, designated I, II and III: lead I records the potential difference between the right and left arms; lead II the difference between right arm and left leg; and lead III the difference between left arm and left leg.

Synonym: indirect lead.


cloaca (sh)




In vertebrates, common chamber and outlet into which the intestinal, urinary, and genital tracts open.

It is present in amphibians, reptiles, birds, some fishes (e.g., sharks), and monotreme mammals but is absent in placental mammals and most bony fishes. Certain animals (e.g., many reptiles and some birds, including ducks) have an accessory organ (penis) within the cloaca that is used to direct the sperm into the female's cloaca. Most birds mate by joining their cloacas in a "cloacal kiss"; muscular contractions transfer the sperm from the male to the female.