ZOO 2090 Study Guide - Final Guide: Baculum, Accessory Nerve, Incus

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2090
• Professor: Jinzhong Fu

Document Summary

Phylum chordata: notochord, dorsal hallow nerve chord, pharyngeal slits, subpharyngeal gland (endostyle, post anal tail. Myomeres (v shaped) muscle segments connected by connective tissue called myomeres. No paired lateral appendages but 2 medial dorsal fins. Inteument: osmotic pressure regulation, protection from friction stress, colouration for camo or sex. Skeletal: attachment for muscles for locomotion, protecting internal structures. Placoid scales with hooks to allow for water flow. Dermis divided to stratum spongiosum on top and stratum compactum on bottom dermally derived scale. Vertebral column protects spinal chord and aids in locomotion. Ganoid scales (gars and bichars) rhomboidal and opaque, enamel like coating on top of bony base. Cycloid are thin somewhat transparent smooth edge no enamel. Ctenoid comb like projections on distal margin no enamel. 5 gill slits hyostylic or autostylic jaw suspension females don"t. Splanchnocranium- still 7 visceral arches see pic in book.