BIOL 2030 Chapter Notes - Chapter 8: Notochord, Cecum, Midgut
26 Feb 2017
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Casts out internal organ when in danger and quickly regenerates organs after. Respiration though internal evaginations called respiratory trees (cid:120) external anatomy: To distinguish from ventral and dorsal find genital pore (located mid dorsal, (black dot)) Ventral surface consist of more tube feet. Body divided into three reigions: (cid:131) proboscis : used for burrowing in sand (cid:131) collar (cid:131) trunk (cid:120) thoracic region (cid:120) hepatic region (cid:120) abdominal region (cid:120) Anterior end has two openings: (cid:131) terminal mouth on incurrent siphon (cid:131) atrial opening on a projection (cid:120) marks dorsal view. Identify: (cid:120) (cid:190) anterior mouth (cid:190) dorsal or more posterior atriopre (cid:190) dark shaped otocyst (cid:190) pigmented eyespot (cid:190) notochord (cid:190) muscle bands. Genus: branchiostoma (commonly referred to as amphioxus) (cid:120) Anterior to the ventral fin is atripore. Pigemented eye spot is not sensitive to light. Four characteristics of amphiouxus: (cid:131) notochord (cid:131) pharyngeal gill slits (cid:131) dorsal hallow nerve chord (cid:131) post-anal tail.
