from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The cartilaginous cranium of an embryo before ossification.
- noun A portion of the embryonic cranium forming the bones of the base of the skull and eventually undergoing ossification.
from The Century Dictionary.
- noun A cartilaginous skull; a skull permanently cartilaginous, as that of many fishes.
- noun The cartilaginous as distinguished from the membranous portions of an embryonic skull, which may eventually become entirely bony; that portion of an osseous skull which is preformed in cartilage.
- noun In ichthyology, the persistent cartilaginous portion of the cranium occurring in many osseous fishes, such as the salmonids, subjacent to the bones.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun anatomy The developing
skull, composed of cartilage, of an embryobefore ossification
Sorry, no etymologies found.
In the shark and dog-fish this membranous cranium undergoes complete chondrification, and forms the cartilaginous skull or chondrocranium of these animals.
Some of them remain distinct throughout life, e.g., parietal and frontal, while others join with the bones of the chondrocranium, e.g., interparietal, squamæ of temporals, and medial pterygoid plates.
Model of the chondrocranium of a human embryo, 8 cm. long.
70 Model of the chondrocranium of a human embryo, 8 cm. long.