BS 110 Notes 11-5-2010

Radial plane of cell division is at right angles

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Radial – plane of cell division is at right angles/ parallel to the longitudinal axis of the embryo and newly formed cells do not have a spiral pattern b. Mouth originates away from the blastopore which develops into the anus 9. Chordata a. Segemented body, well developed organ systems within a tube body plan b. Notochord, dorsal hollow never cord, gill slits, myotomes i. Notochord – firm rod shaped structure that runs longitudinal to the digestive tract and provides support. Develops into spinal cord and brain and depending on the chordate, may or may not form structures ii. Myotomes – specific pockets of muscle
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c. Hemichordata – phylum of a small number of advanced worm-like animals that have some echinoderm characteristics and some chordate characteristics. Ancestral group of hemichordates are the transitional/evolutionary group between some echinoderm group and the early chordates d. 3 subphylum i. Urochordata – tunicates – larvae line, basket like, filter feeders ii. Cephalochordata – marine – lancelots- larvae and fishlike, filter feeders iii. Vertebrata – notochord enlarges and becomes partially or completely replaced by cartilage and/or bone and develops into the vertebral column (backbone) and cranium (skull)Offers protection, Large amount of surface area for muscle ,Flexible framework i. 7 Classes
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  • Fall '07
  • newly formed cells, egg cleavage, early embryological development

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