Meckel's cartilage
4187864
163865377
2007-10-11T19:06:55Z
Arcadian
104523
{{Embryology of head and neck}}
{{Infobox Embryology |
Name = {{PAGENAME}} |
Latin = |
GraySubject = 13 |
GrayPage = 66 |
Image = Gray43.png |
Caption = Head and neck of a human embryo eighteen weeks old, with Meckel’s cartilage and hyoid bar exposed. |
Image2 = Gray181.png |
Caption2 = Mandible of human embryo 95 mm. long. Inner aspect. Nuclei of cartilage stippled. |
System = |
CarnegieStage = |
Days = |
Precursor = [[first branchial arch]] |
GivesRiseTo = [[incus]], [[malleus]] |
MeshName = |
MeshNumber = |
DorlandsPre = c_12 |
DorlandsSuf = 12216762 |
}}
The cartilaginous bar of the [[mandibular arch]] is formed by what are known as '''Meckel’s cartilages''' (right and left) ; above this the [[incus]] is developed.
The dorsal end of each cartilage is connected with the ear-capsule and is ossified to form the [[malleus]]; the ventral ends meet each other in the region of the [[symphysis menti]], and are usually regarded as undergoing [[ossification]] to form that portion of the [[mandible]] which contains the [[incisor teeth]].
The intervening part of the cartilage disappears; the portion immediately adjacent to the malleus is replaced by fibrous membrane, which constitutes the [[sphenomandibular ligament]], while from the connective tissue covering the remainder of the cartilage the greater part of the mandible is ossified.
==Additional images==
<gallery>
Image:Gray1011.png|Vertical section of the mandible of an early human fetus. X 25.
</gallery>
==External links==
* [http://www.palaeos.com/Vertebrates/Bones/Gill_Arches/Meckelian.html palaeos.com]
* {{WhoNamedIt|synd|2049}}
{{Gray's}}
{{musculoskeletal-stub}}
{{developmental-biology-stub}}
{{Embryology of head and neck}}[[Category:Embryology]]