ZOO 3050 Lecture Notes - Lecture 15: Lateral Plate Mesoderm, Paraxial Mesoderm, Intermediate Mesoderm
13 Apr 2018
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Mesoderm: gives rise to most of body mass, forms both epithelia and large amounts of mesenchym, epithelium, sheets of tightly joined cells, mesenchyme. Isolated cells surrounded by large amount of ecm. Mesoderm lineages: intermediate mesoderm, chordamesoderm, paraxial mesoderm, lateral plate mesoderm. Intermediate mesoderm: forms genital and urinary tract, kidneys and somatic part of gonads. Chordamesoderm: forms notochord, transient tissue, most notochord eventually degenerates, discs between vertebrae remnants of notochord (forms nucleus pulposa) 2 subtypes: somitic mesoderm, forms somites, paired blocks of transcient tissue either side of nt, bones/cartilage of: Spinal column + ribs axial skeletons: muscles, dermis, head mesoderm, forms connective tissues + musculature of face, mesoderm from 1st somite, connective tissue: characterized by large amounts of ecm. 3 subtypes of lateral plate mesoderm: splanchnic mesoderm, heart, peritoneum. Lecture 15-16-paraxial mesoderm: somatic mesoderm, limb bones. Internal layer of connective tissue: pelvis, extra-embryonic, extraembryonic membranes, chorion, umbilical cord.
