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cartilage primordia adjacent on either side to the cephalic portion of the notochord in young embryos; they represent an initial step in the formation of the chondrocranium.
Farlex Partner Medical Dictionary © Farlex 2012
One of a pair of cartilages in the cephalic portion of the notochord of the embryo that unites in humans to form a single basal plate that is the forerunner of the occipital bone.
See also: cartilage
Medical Dictionary, © 2009 Farlex and Partners