Definitions
from The Century Dictionary.
- Situated in front of the notochord: applied to those parts of the brain which are anterior to the end of the chorda dorsalis: correlated with epichordal and parachordal.
- Prior in time to the existence of the Chordata or chor-date animals; before the evolution of a notochord in animals.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective In front of the
notochord
Etymologies
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Examples
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Recent observations have shown that, in mammals, the basi-cranial cartilage, both in the chordal and prechordal regions of the base of the skull, is developed as a single plate which extends from behind forward.
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In the lower vertebrates two pairs of cartilages are developed, viz., a pair of parachordal cartilages, one on either side of the notochord; and a pair of prechordal cartilages, the trabeculæ cranii, in front of the notochord (Fig. 66).
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The base of the skull may therefore be divided into (a) a chordal or vertebral, and (b) a prechordal or prevertebral portion.
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