Dermal bone: Difference between revisions

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A '''dermal bone''' or '''membrane bone''' is a bony structure derived from [[intramembranous ossification]] forming components of the [[vertebrate]] [[skeleton]] including much of the [[skull]], [[jaw]]s, [[gill]] covers, shoulder girdle and [[fin]] spines rays ([[lepidotrichia]]), and the [[Turtle shell|shell]] (of [[tortoise]]s and [[turtle]]s). In contrast to [[endochondral ossification|endochondral]] bone, dermal bone does not form from cartilage that then calcifies, and it is often ornamented.<ref name=Bu15>{{cite journal| last1=de Buffrénil |first1=V. | last2=Clarac |first2=F.| last3=Fau |first3=M.| last4=Martin | first4=S.| last5=Martin |first5=B.| last6=Pellé |first6=E.|last7=Laurin |first7=M.|year=2015 |title=Differentiation and growth of bone ornamentation in vertebrates: a comparative histological study among the Crocodylomorpha |journal=Journal of Morphology |volume=276 |issue=4 |pages=425–445 | doi=10.1002/jmor.20351|pmid=25488816 }}</ref> Dermal bone is formed within the [[dermis]] and grows by accretion only – the outer portion of the bone is deposited by [[osteoblast]]s.
The function of some dermal bone is conserved throughout vertebrates, although there is variation in shape and in the number of bones in the [[skull roof]] and postcranial structures. In [[bony fish]], dermal bone is found in the fin [[Ray (fish fin anatomy)|rays]] and scales. A special example of dermal bone is the [[clavicle]]. Some of the dermal bone functions regard biomechanical aspects such as protection against predators <ref name=Ch11>{{cite journal| last1=Chen |first1=IHI.H. | last2=Kiang |first2=JHJ.H.| last3=Correa |first3=V.| last4=Lopeza | first4=MIM.I.| last5=Chen |first5=PYP.Y.| last6=McKittrick |first6=J.|last7=Meyers |first7=MAM.A.|year=2011 |title=Armadillo armor: mechanical testing and micro-structural evaluation.|journal=Journal of Animal Ecology|volume=4|issue=5 |pages=713–722 |doi= 10.1016/j.jmbbm.2010.12.013}}</ref><ref name=Br15>{{cite journal| last1=Broeckhoven|first1=C.Chris | last2=Diedericks |first2=G.| last3=Mouton |first3=PLFNP. le Fras N.| year=2015 |title=What doesn’t kill you might make you stronger: functional basis for variation in body armour ?|journal=Journal of Animal Ecology |volume=84|pages=1213–1221|doi=10.1111/1365-2656.12414}}</ref><ref name=Cl19b>{{cite journal| last1=Clarac |first1=F. | last2=Goussard |first2=F.| last3=de Buffrénil |first3=V.| last4=Sansalone| first4=V.|year=2019 |title=The function(s) of bone ornamentation in the crocodylomorph osteoderms: a biomechanical model based on a finite element analysis. |journal=Paleobiology |volume=45 |issue=1 |pages=182–200 | doi=10.1017/pab.2018.48}}</ref>. The dermal bones are also argued to be involved in ecophysiological implications such as the heat transfers between the body and the surrounding environment when basking (evidenced in crocodilians) <ref name=Cl19>{{cite journal| last1=Clarac |first1=F. | last2= Quilhac |first2= A.|year=2019 |title= The crocodylian skull and osteoderms: A functional exaptation to ectothermy?|journal=Zoology |volume=132|pages=31–40 | doi=10.116/j.zool.2018.12.001}}</ref> as well as in bone respiratory acidosis buffering during prolonged apnea (evidenced in both crocodilians and turtles) <ref name=Ja99>{{cite journal| last1=Jackson |first1=DCD.C. | last2= Goldberger |first2=Z.| last3= Visuri |first3=J.| last4= Armstrong | first4=RNR.N.|year=1999 |title= Ionic exchanges of turtle shell in vitro and their relevance to shell function in the anoxic turtle|journal=Journal of Experimental Biology |volume=202|pages=503-520}}</ref><ref name=Ja03>{{cite journal| last1=Jackson |first1=DC. | last2= Andrade |first2=D.| last3= Abe |first3=AS.|year=2003 |title= Lactate sequestration by osteoderms of the broad-nose caiman, Caiman latirostris, following capture and forced submergence. |journal=Journal of Experimental Biology |volume=206|pages=3601–3606}}</ref>. These ecophysiological functions rely on the set-up of a blood vessel network within and straight above the dermal bones. <ref name=Cl18>{{cite journal| last1=Clarac |first1=F. | last2= de Buffrénil |first2=V.| last3= Cubo|first3=J.| last4=Quilhac| first4=A.|year=2018 |title= Vascularization in ornamentedosteoderms: physiological implications in ectothermy and amphibious lifestyle in the crocodylomorphs? |journal=Anatomical Record |volume=301|pages=175–183 | doi=10.1002/ar.23695}}</ref>