The Norway rat ( Rattus norvegicus ) has been a model organism in biomedical research for over 150 years due to its short gestation period, docile nature, and, most importantly, its possession of a mammalian body plan that is homologous to that of Homo sapiens . While modern imaging techniques such as MRI and CT scanning offer non-invasive alternatives, direct dissection remains the gold standard for learning three-dimensional spatial relationships among organ systems. This laboratory exercise employs guided dissection of a preserved, double-injected (latex-colored arteries red, veins blue) rat to examine the macroscopic anatomy of the digestive, respiratory, circulatory, and urogenital systems.
The purpose of this dissection is threefold. First, we will identify the organs of the digestive system, including the esophagus, stomach, small intestine, cecum, and large intestine. Second, we will locate the heart, lungs, trachea, and major blood vessels of the circulatory and respiratory systems. Third, we will examine the urogenital system and determine the sex of our specimen by observing the presence of either testes (male) or a bicornuate uterus (female). rat dissection lab report introduction full
Introduction For over a century, the laboratory rat ( Rattus norvegicus ) has served as a cornerstone of biological and medical education. The rat dissection lab report is often the most demanding assignment in a high school Advanced Placement (AP) Biology, college General Zoology, or undergraduate Human Anatomy course. At the heart of this report lies the introduction —a section that many students underestimate but instructors scrutinize most. The Norway rat ( Rattus norvegicus ) has
The principle of anatomical conservation among placental mammals provides the rationale for using the rat ( Rattus norvegicus ) as a surrogate for human anatomy education. Despite approximately 85 million years of evolutionary divergence between Rodentia and Primates, the fundamental organization of the major organ systems—digestive, respiratory, circulatory, urogenital, and nervous—has been preserved due to shared developmental genetic regulatory networks (e.g., Hox gene expression patterns). This laboratory report details a complete dissection of a formalin-preserved, double-injected (red latex in arteries, blue latex in veins) rat, with the goal of establishing a direct, hands-on understanding of mammalian viscera. The purpose of this dissection is threefold