BIO 1305 Lecture Notes - Lecture 9: Archenteron, Endoderm, Triploblasty
16 Dec 2017
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Eukaryotic multicellular with proteins external to the cell membrane provide structural support to cells and connect them to one another: refer to figure 32. 2 and write out the steps of embryonic development. Acoelomate, pseudomate, coelomate: make a chart comparing protostomes to deuterostomes. Spiral determinate: cleavage planes of cell division are diagonal to the vertical axis of the embryo and the fate of each embryonic cell develops very early. Solid masses of mesoderm split and form the coelom. Radial indeterminate: cleavage planes are either parallel or perpendicular to the vertical axis of the embryo and each cell produced by early cleavage division retains the capacity to develop into a complete embryo. Mesoderm buds from the wall of the archenteron and its cavity becomes the coelom. Eumetozoa (true animals) is a clade with true tissues. 3 major clades of bilaterial: deuterostomia, ecydozoa, lophotrochozoa includes all invertebrates and chordates (vertebrate: describe the three clades of bilaterian animals.
