Key Anatomical Directions
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1 Dissection Anatomical Direction Before beginning a dissection, it is important to have an understanding of some of the basic directional terminology associated with the dissection of specimens. Some of these terms include proximal, which means toward the body, and distal, which means to move away from the body. Other important anatomical directions are indicated below. Key Anatomical Directions Dissection Safety Proper safety procedures when working with dissection tools and specimens is of greatest importance. Some safety rules to engage in when dissecting specimens are as follows. Dissection Safety Rules Follow all instructions given by your teacher. Inform your teacher of any illness as a result of exposure to chemicals used in specimen preparation. Avoid contact with preservative chemicals. Rinse the specimens completely before dissection. Know where the eye-wash fountain is if needed. Wear safety goggles to prevent the splashing of any chemicals into the eyes. Properly mount dissection specimens to dissecting pan. Do not dissect a specimen while holding it. Handle scalpel or razor blade (safety edged) with extreme 1
2 care. Always cut away from your body and away from others. Never ingest specimen parts. Never remove specimens or specimen parts from the classroom -- until the dissection is completed all parts of the dissection must remain within the dissecting pan. Properly dispose of dissected materials. Store specimens in as directed by your teacher. Clean up the work area and return all equipment to the proper place when the dissection is completed. Wash hands after each dissection. Dissection Equipment Dissection Equipment The pictured dissection equipment from left to right is (1.) a teasing or dissection needle which used to pull apart muscle tissue, (2) dissecting scissors which are used to cut through tissue, and (3) a scalpel, which is a knife used to slice through and cut tissue. Plant Dissection Many kinds of flowering plants, such as lilies, daffodils, or tulips are commonly subjects for dissection in biology. The flower is the plant structure specialized for reproduction in advanced plants. The processes of meiosis and fertilization occur in the flower. 2
3 Some Key Flower structures petals: colored parts inside the sepals which attract insects sepals: structures which are usually green outside the petals which help to protect the flower stamen: forms the male reproductive organ and consists of an anther and a filament anther: pollen box in which pollen grains are formed containing the genetic material which produces sperm filament: supports the anther pistil or carpel: female reproductive organ which consists of three parts stigma: found at the top of the pistil, is often sticky and hairy adapting it to catch and hold pollen style: tube-like connection between the stigma and the ovary ovary: enlarged part of the pistil attached to the receptacle (stem tip on which the flower rests) and contains the ovules ovules: small white structures within the walls of the ovary which produces the plant egg cells 3
4 Animal Dissection The dissection of animals is important for many reasons. It helps in the learning about the internal structures of animals. It also allows students to learn how organs and tissues are interrelated. Another purpose of dissection is to allow the comparison of organisms in terms of their organs and relative complexities. While many good simulations of dissections may be observed, it seldom can replace the benefits of the actual participation in an actual dissection. A common invertebrate organism dissected is the honey bee. Usually the dissection procedure involves cutting the organism open on its ventral side and teasing/peeling its tissues and muscles back to observe internal organs. Different teachers may have their own preferences in terms of their emphasis on the tissues and organs to be observed in a dissection. Key Internal Organs of the Honey Bee Organ Body System Major Function brain nervous thinking and coordination of body activities heart circulatory pumps blood through the body stomach digestive stores and begins the chemical digestion of food midgut mandibular gland digestive digestive finishes chemical digestion and absorbs digested nutrients into the blood begins chemical digestion of food in the mouth aorta circulatory transports blood to the thorax and head trachea malphigian tubules venom gland respiratory excretory Immune/defen se exchanges gases with the external environment (aided by the skin in the frog) filter wastes from the blood Produces poison for stinger ganglia nervous nerve clusters controlling reflex reactions muscle muscular control movement of appendages ovaries reproductive makes eggs in queen bee testes reproductive makes sperm in drone bee Honey Bee Internal Anatomy 4
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Original content Copyright by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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