BIOL 1412 Chapter Notes - Chapter 31 and 40: Extracellular Fluid, Extracellular Matrix, Tube Feet
1 Mar 2016
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Cellular morphological synapomorphies: extracellular matrix molecules : collagen and proteoglycans, unique junction types between cells. Developmental patterns differentiate animal groups: cleavage(radial[sponges] vs. spiral[lophotochozoans, edysozoans have idiosyncratic cleavage pattern, triplobastic vs. diplobasltic, symmetry of the body. Triplobastic group is divided into two major groups based on how gastrulation occurs immediately after the blastopore is formed: Simplest form of symmetry is spherical symmetry- body parts radiate out form a central point [mostly in unicellular protists] Radial symmetry-body parts are arranged around one main axis at the body"s center. Back is called dorsal, underside is ventral. Correlated with cephalization-concentration of sensory organs and nervous tissues at the anterior end of the animal: structure of the body cavity. Body plans of triploblastic animals can be divided into three types, based on presence and structure of body cavity. Aceoelomate- lack enclosed fluid filled body cavity: instead they have masses of cells called mesenchyme between their gut and the body wall.
