Mesoderm

The mesoderm (from Gr. Μέσος [mé sos ] "middle", "middle" and  to derma  "skin") is the middle cotyledon of the embryoblast . The mesoderm cells arise in humans in the third week of development through immigration between the epiblast and hypoblast ( enterocoelia ). The term mesoderm is not synonymous with mesenchyme . Mesoderm is an ontogenetic term, whereas mesenchyme is a histological one .

The following structures are formed from the mesoderm:

• Notochord and the resulting nuclei pulposi of the intervertebral discs
• Lining of the coelom
• bone
• Skeletal muscles
• connective tissue
• smooth muscles of the viscera
• heart
• Blood vessels
• Blood cells
• spleen
• Lymph nodes
• Lymphatic vessels
• Adrenal cortex
• Kidneys
• Gonads
• internal genital organs
• Microglia

Subdivision

• Intraembryonic mesoderm formed from the epiblast
  • Axial mesoderm ( notochord )
  • Paraxial mesoderm ( somites ; sclerotome , myotome , dermatome )
  • Intermediate mesoderm ( urinary and sexual apparatus )
  • Lateral mesoderm or side plate mesoderm (serous lining of the body cavities: pleura, peritoneum, pericardium )
• Extraembryonic mesoderm formed from the hypoblast
  • clothes chorionic from

Web links

Commons : Mesoderm  - collection of images, videos and audio files

Wiktionary: Mesoderm  - explanations of meanings, word origins, synonyms, translations

See also

• Ectoderm
• Endoderm

Individual evidence

1. ^ Neil A. Campbell , Jane B. Reece : Biology. Spektrum-Verlag 2003, ISBN 3-8274-1352-4 , page 1208