BIOL 1004 Lecture Notes - Lecture 15: Depth Perception, Yolk Sac, Bipedalism

• School: Carleton University
• Department: Biology
• Course: BIOL 1004
• Professor: Gregory Bulte

Document Summary

Some species have some of there traits only during embryonic development. Early in cambrian period (530 million years) Animals called vertebrates get their name from vertebrae; series of bones that make up backbone. Post anal tail: includes the anus and muscles. Notochord: is a longitudinal, flexible rod between digestive tube and nerve cord. Provides skeletal support throughout most of the length of a chordate. In most vertebrates, more complex, jointed skeleton develops, and adult retains only remnants of embryonic notochord. Ner(cid:448)e (cid:272)ord: de(cid:448)elops i(cid:374)to (cid:272)e(cid:374)tral (cid:374)er(cid:448)ous syste(cid:373) (cid:862)(cid:271)rai(cid:374) a(cid:374)d the spi(cid:374)al (cid:272)ord(cid:863) In most chordates, grooves in pharynx called pharyngeal clefts develop into slits that open to the outside of body. Function of pharyngeal slits: suspension-feedi(cid:374)g stru(cid:272)tures i(cid:374) (cid:373)a(cid:374)y i(cid:374)(cid:448)erte(cid:271)rate"s (cid:272)hordates, gas exchange in vertebrates except the ones with limbs and tetrapod, de(cid:448)elop i(cid:374)to parts of the ear, head, a(cid:374)d (cid:374)e(cid:272)k i(cid:374) tetrapod"s. Chordates ha(cid:448)e a tail posterior to a(cid:374)us (cid:862)tail is greatly redu(cid:272)ed duri(cid:374)g e(cid:373)(cid:271)ryo(cid:374)i(cid:272) de(cid:448)elop(cid:373)e(cid:374)t(cid:863)