Chondrocranium

Chondrocranium

The chondrocranium (or cartilaginous neurocranium) is the primitive cartilaginous skeletal structure of the fetal skull that grows to envelop the rapidly growing embryonic brain.[1]

In humans, the chondrocranium begins forming at 28 days from mesenchymal condensations and is fully formed between week 7 and 9 of fetal development. While the majority of the chondrocranium is succeeded by the bony skull in most higher vertebrates, some components do persist into adulthood.[1] In cartilaginous fishes (e.g. sharks and rays) and agnathans (e.g. lampreys and hagfish), the chondrocranium persists throughout life.[2] Embryologically, the chondrocranium represents the basal cranial structure, and lays the base for the formation of the endocranium in higher vertebrates.[3]

Divisions

The portion of the chondrocranium that is associated with the notochord is termed the chordal chondrocranium and is formed from mesodermally-derived mesenchyme. The more rostral portion of the chondrocranium that lie anterior to the notochord constitutes the prechordal chondrocranium, and is derived primarily from neural crest-derived mesenchyme.[1]

See also

References

  1. ^ a b c Salentijn, L. Biology of Mineralized Tissues: Prenatal Skull Development, Columbia University College of Dental Medicine post-graduate dental lecture series, 2007
  2. ^ Kent, G.C & Miller, L. (1997): Comparative Anatomy of the Vertebrates. Wm. C. Brown Publishers. ISBN # 0-697-24378-8.
  3. ^ Romer, Alfred Sherwood; Parsons, Thomas S. (1977). The Vertebrate Body. Philadelphia, PA: Holt-Saunders International. pp. 216–247. ISBN 0-03-910284-X. 



Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Chondrocranium —   [ç ], der Knorpelschädel …   Universal-Lexikon

  • Chondrocranium — kremzlinė kaukolė statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Chondrocranium ryšiai: platesnis terminas – kaukolė …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Chondrocranium — kremzlinė kaukolė statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Chondrocranium ryšiai: platesnis terminas – kaukolė siauresnis terminas – ausies kapsulė siauresnis terminas – nosies kapsulė siauresnis… …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Chondrocranium — kremzlinė kaukolė statusas T sritis embriologija atitikmenys: lot. Chondrocranium ryšiai: platesnis terminas – ašiniai griaučiai siauresnis terminas – ausies kapsulė siauresnis terminas – nosies kapsulė siauresnis terminas – pakauškaulio… …   Medicininės histologijos ir embriologijos vardynas

  • chondrocranium — noun Etymology: Greek chondros grain, cartilage Date: 1875 the cartilaginous parts of an embryonic cranium; also the part of the adult skull derived therefrom …   New Collegiate Dictionary

  • chondrocranium — the cartilaginous skeleton enclosing the brain, olfactory region, eye and inner ear. Part of skull first formed in the embryo. Forms the whole skull in Cyclostomata, Elasmobranchii and Holocephali. Covered by dermal bones in Teleostomi and… …   Dictionary of ichthyology

  • chondrocranium — /kon droh kray nee euhm/ n., pl. chondrocraniums, chondrocrania / nee euh/. a braincase composed of cartilage rather than bone, as the skull of sharks and of the vertebrate embryo before ossification. [1870 75; CHONDRO + CRANIUM] * * * …   Universalium

  • chondrocranium — noun The developing skull, composed of cartilage, of an embryo before ossification …   Wiktionary

  • chondrocranium — A cartilaginous skull; the cartilaginous parts of the developing skull. [chondro + G. kranion, skull] * * * chon·dro·cra·ni·um .kän drə krā nē əm, drō n, pl nia the embryonic cartilaginous cranium also the part of the adult skull derived… …   Medical dictionary

  • chondrocranium — n. part of the skull of an embryo comprising cartilage that later hardens into bones of the base of the skull …   English contemporary dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”