BIO 2135 Lecture Notes - Lecture 10: Herbivore, Pedicellaria, Gonad
28 Sep 2016
School
Department
Course
Professor
Document Summary
Get a single epithelial layer invaginating inward to make second type of epithelium (digestive epithelium) and it is endoderm. Endoderm is the gut = the opening to the cavity is the opening to the digestive tract, which is the blastopore. Two fates: blastopore becomes the mouth for protostome, blastopore becomes the anus for deuterostome. Commonly included in the development of the deuterostomes. Body cavity back filling mesoderm at the lip of the blastopore and having it split open, had enteron, a little bubble of mesoderm forms and fills the space in between. The problem is that enterocoel always has three pieces to it: proteocoel, mesocoel, and metacoel and also appears in the lophophorates. Tripartite coelom and entercocoelom shouldn"t be used as deuterostome characteristics b/c it occurs up in the protostome lineage as well. Unique shape larval stage that has ciliated band of tissue around the bell. Suspended in it is the organism with the anus and mouth on opposite sides.
