W
white matter Bundles of myelinated axons located in the central nervous system.
wormian bone (wer´me-an) See sutural bone.
Y
yellow marrow (mar´o) Specialized lipid storage tissue within bone cavities.
Z
zygote (zi´g=ot) A fertilized egg cell formed by the union of a sperm cell and an ovum.
zymogens (zi´muo-jenz) Inactive enzymes that become active when part of their structure is removed by the action of another enzyme or by some other means.
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