BIOSC 1200 Study Guide - Midterm Guide: Chondrogenesis, Limb Bud, Acanthostega
23 Nov 2017
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Appendicular skeleton study guide: briefly define the technical terms used in the lectures. It should be noted that gnathostomata is delimited by chondrychthes, so i"m going to describe their fins. They have paired pectoral fins (aka forefins), paired pelvic fins (aka hindfins), pelvic and pectoral girdles that support the fins. The fins are narrow-based, stiff, and in a fixed area. They"re function is for stability, some turning, and the caudal fin proves for locomotive force: explain how ichthyostega (which is called eusthenopteron in the book) and acanthostega form connecting links between fishes and tetrapods. Fig 9-8 in book: ichthyostega is the ancestral fish (with fins) and acanthostega is the derived tetrapod (with limbs). There are several reasons for this: first, it is important to note that both have single proximal elements (the humorous) and a radius and an ulna. They are homologous because they are similar in shape and location: acanth.
