Vertebrates. Chapter 34. 4 Chordate Characteristics. 1. Notochord Long, flexible rod between digestive tube and nerve cord NOT the spinal cord 2. Dorsal Hollow Nerve Chord Formed from ectoderm 3. Pharyngeal Clefts (Gills) Pouches along side of pharynx 4. Post-anal Tail
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4 Extra embryonic Membranes:
1. Amnion – encloses the embryo in fluid sac Shock absorption
Chorion & Allantois– Gas exchange
Allantios – disposal sac for metabolic wastes
Yolk Sac – contains the yolk (nutrient stockpile)