EEB263H1 Lecture Notes - Sagittal Plane, Notochord, Chordate
13 Mar 2014
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Document Summary
Topic: how form fits function in vertebrates. Long axis of body parallel to ground (in reference to the planes of axis) Sagittal plane: splits body into right + left. Parasagittal: divides left + right body into unequal parts. Transverse plane: divides body into front + back. Frontal plane: divides body into upper + lower parts. Used in reference to limbs. Artery (reference point = heart) Nerve (reference point = spine) Combinations of directions = oblique directions. Node: indication that two groups are sister- groups. Axial, stiffening structure, mid- axial (analogous to the spinal cord) Fluid filled (acts as a structural component) Rod cannot be compressed (due to fibrous columns) Filter- feeder (entraps suspended food with mucus) Colonial organism that lives in a tube- like structure. Waves created by tentacles. Proboscis: front end (excretes mucus containing food particles) No pharyngeal gills and notochord. Acorn worms: filter feeders that make burrows (lots of pharyngeal slits)
