Comparative Anatomy Lab Lab 10: Cat Dissection Week 1 Bio-220L-W02Aim: To dissect and examine the internal anatomy of the cat.Introduction:
This week, we will dissect a cat in order to understand anatomy better. Interesting creaturesthat they are, cats have many unique characteristics. Their eyes and ears aid them with everymove while their coat functions as a blanket in winter and their tongue acts as a comb as wellas a warming and cooling device. Cat anatomy is the simple anatomy or consideration of thestructure of the internal body parts of a cat. Concisely, as a cat is a carnivore since longtimes, it has its mouth and claws specially adapted for victimizing the prey. It has thesharpest sense organs for early caution and various other specialties. Cats have highlyspecialized teeth for the killing of prey and the tearing of meat. The premolar and firstmolar together compose the carnassial pair on each side of the mouth, which efficientlyfunctions to shear meat like a pair of scissors. While this is present in canids, it is highlydeveloped in felines. The cats tongue has sharp spines, or papillae, useful for retaining andripping flesh from a carcass. These papillae are small backward-facing hooks thatcontain keratin which also assist in their grooming. Like nearly all members of thefamily Felidae, cats have retractable claws. In their normal, relaxed position, the claws aresheathed with the skin and fur around the toe pads. This keeps the claws sharp by preventingwear from contact with the ground and allows the silent stalking of prey. ats possess ratherloose skin; this allows them to turn and confront a predator or another cat in a fight, evenwhen it has a grip on them. This is also an advantage for veterinary purposes, as it simplifiesinjections. In fact, the lives of cats with kidney failure can sometimes be extended for yearsby the regular injection of large volumes of fluid subcutaneously, which serves as analternative to dialysis. Cats possess rather loose skin; this allows them to turn and confront apredator or another cat in a fight, even when it has a grip on them.
Materials: • Pencil/drawing utensil • White paper • Dissection Kit • Turtle for dissection • Dissection tray • Bleach • Paper towels • Pins • Models labeled “A-G” • Models labeled numbers “1-11”Method:- Obtain everything as instructed.1. Obtain dissection tray.2. Clean dissection tray with bleach and wipe dry.3. Place specimen on the tray dorsally.4. Take scalpel and cut the specimen starting from the anterior mid-sagittal plane.5. Identify the structures accordingly.6. Draw all the models as displayed once the dissection is completeResults/Diagrams:
- The drawings of all the skeletons and dissections are attached and labeled accordingly.Discussion:Although we did not dissect the cat today, we did examine the external physical features ofthe cat through the bag that it was enclosed in. In addition, we sketched more models of cats,birds, and reptiles. This provided us with a better understanding of the skeletal anatomy of allof these creatures. The cat is a very complex mammal that shares many characteristicssimilar to humans. By understanding the cat better, we can better understand humans.Conclusion:Cats are mammals classified as Felis catus under the current scientific classification system.Domestic cats are characterized by a number of well-known physical characteristics. Theseinclude a flexible and compact body, keen eyesight and adaptations for visual acuity at night,retractable claws, sharp teeth and a reduction in numbers of teeth reflecting adaptation as acarnivore, long vibrissae, and a long and flexible tail important as an aid to balance. Thedomestic cat was first classified as Felis catus by Carolus Linnaeus in the tenth edition ofhis Systema Naturae of 1758. However, because of modernphylogenetics, domestic cats arenow usually regarded as another subspecies of the Wildcat Felis silvestris. This has resultedin mixed usage of the terms, as the domestic cat can be called by its subspecies name, Felissilvestris catus. Wildcats have also been referred to as various subspecies of F. catus, but in2003 the International Commission on Zoological Nomenclature fixed the name for wildcats
as F. silvestris. The most common name in use for the domestic cat remains F. catus,following a convention for domesticated animals of using the earliest (thesenior) synonym proposed. Sometimes the domestic cat is called Felis domesticus or Felisdomestica, the term coined by German naturalist Johann Christian Polycarp Erxleben in1777. These are not valid taxonomic names, and Linnaeuss binomial takes precedence. Catshave 7 cervical vertebrae like almost all mammals, 13 thoracic vertebrae (humans have 12),7 lumbar vertebrae (humans have 5), 3 sacral vertebrae like most mammals (humans have 5because of their bipedal posture), and a variable number of caudal vertebrae in the tail(humans retain 3 to 5 caudal vertebrae, fused into an internal coccyx). The extra lumbar andthoracic vertebrae account for the cats spinal mobility and flexibility. Attached to the spineare 13 ribs, the shoulder, and the pelvis. Unlike human arms, cat forelimbs are attached to theshoulder by free-floating clavicle bones, which allow them to pass their body through anyspace into which they can fit their heads.No Addendum Questions handed out this week.