00:10
00:09
00:08
00:07
00:06
00:05
00:04
00:03
00:02
00:01
| a semilunar valve between the pulmonary artery and the right ventricle of the heart that prevents the blood from flowing back into the right ventricle |
| ductless glands above the kidneys, consisting of a cortex producing steroidal hormones, and a medulla producing epinephrine and norepinephrine |
endosteum en·dos·te·um (ěn-dŏs'tē-əm)
n. pl. en·dos·te·a (-tē-ə)
The thin layer of cells lining the medullary cavity of a bone. Also called medullary membrane.