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|Embryology: Paraxial mesoderm|
|Transverse section of a chick embryo of forty-five hours’ incubation.|
* Chordamesoderm: yellow, at notochord.
* Paraxial mesoderm: red, at somite.
* Intermediate mesoderm: purple, near Wolffian duct.
* Lateral plate mesoderm: purple, near "Somatic mesoderm" and "Splanchic mesoderm".
|Chick embryo of thirty-three hours’ incubation, viewed from the dorsal aspect. (Paraxial mesoderm labeled at left.)|
|Gray's||subject #6 50|
|Gives rise to||somitomere, head mesoderm|
- Somites form the vertebral column dermis and skeletal muscle
- Branchial arches will develop into facial muscle and cartilage, plus other structures.
- eventually differentiates into the axial skeleton, skeletal muscle, part of the dermis
- almost immediately as it is formed, somitomeres develop.
- starts with several pairs in the cranial region, and increasingly more proceed to develop towards
the caudal region.
- The original seven pairs form the straited muscles of head and neck, which develop within the
- The other somitomeres develop further, to form discrete blocks called somites, starting at
approximately 20 days.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
|Mammalian development of embryo and development and fetus (some dates are approximate - see Carnegie stages) - edit|
Week 2: Yolk sac | Vitelline duct | Bilaminar disc
Week 3: Hensen's node | Gastrula/Gastrulation | Trilaminar embryo Branchial arch (1st) | Branchial pouch | Meckel's cartilage | Somite/Somitomere | Germ layer (Ectoderm, Endoderm, Mesoderm, Chordamesoderm, Paraxial mesoderm, Intermediate mesoderm, Lateral plate mesoderm)
|Histogenesis and Organogenesis|
Circulatory system: Primitive atrium | Primitive ventricle | Bulbus cordis | Truncus arteriosus | Ostium primum | Foramen ovale | Ductus venosus | Ductus arteriosus | Aortic arches | Septum primum | Septum secundum | Cardinal veins
Urinary/Reproductive system: Urogenital folds | Urethral groove | Urogenital sinus | Kidney development (Pronephros | Mesonephros | Ureteric bud | Metanephric blastema) | Fetal genital development (Wolffian duct | Müllerian duct | Gubernaculum | Labioscrotal folds)
Glands: Thyroglossal duct
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