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08 RAT LAB 2009 - A William Allen Office hours Monday 10:00...

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A. William Allen Office hours: Monday 10:00 AM to 1:00 PM or by appointment PAI 1.22G
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Reminder: Exam I on Monday March 30 7:30-9:00 PM Covers labs 1-7 Bring #2 pencil
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Go to the Exam room assigned by lecture time 8:00 AM lecture room JES A121A 9:00 AM lecture room UTC 2.112A 2:00 PM lecture room BUR 106
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Structure? Function?
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Rattus norvegicus Dissection
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Rat Dissection Objectives A. Describe structures of the rat, using anatomical directions. B. Describe the major systems of the rat, and compare these system with those of the crayfish and humans. C. Relate the physiology of the major systems of the rat to its anatomy.
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Anatomical terminology
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ANATOMICAL Directions Cranial (Anterior) / Caudal (Posterior) Dorsal / Ventral Lateral / Medial Proximal / Distal Superior / Inferior
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Structures performing similar functions may or may not share a common ancestry. • Homologous • Analogous
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Homologous Organs which are equivalent morphologically and of common evolutionary origin but which may be similar or dissimilar in appearance or function. bird wing vs. reptile forelimb
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Analogous Organs which are similar in appearance and/or function but which are neither equivalent morphologically nor of common evolutionary origin. bird wing vs. insect wing.
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A. Analogous B . Homologous 1. Rat Testis & Ovaries 2. Rat Vas Deferens & Oviduct 3. Crayfish mandibles & rat jaw
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Taxonomy Phylum: Chordata Subphylum: Vertebrata Class: Mammalia Order: Rodentia Family: Muridae • Genus: Rattus • Species: norvegicus or rattus norvegicus
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Phylum Chordata • Invertebrates – Urochordates (tunicates) – Cephalochordates (lanclets) All vertebrates
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Chordate Characteristics {Structures in embryo stage} 1. Notochord (gives name to phylum) 2. Dorsal, hollow nerve cord 3. Pharyngeal silts/pouches 4. Segmented body & Postanal tail
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Few notes on notochord Hollow tube between gut and neural tube
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