#Frog dissection manual skinRemove the skin from one of the hindlimbs. mandible – the lower jaw maxilla – the upper jaw maxillary teeth – a row of teeth found on the margin of the maxilla vomerine teeth – two small patches (bumps) of teeth found on the roof of the mouth in the center of the anterior area internal nares – the nostril openings on the roof of the mouth just lateral to the vomerine teeth eye sockets – on the roof of the mouth where the eyes bulge inward Eustachian tubes – the openings for these tubes are found on each side of the roof of the mouth near the hinge of the jaws esophagus – the opening for this tube is at the back of the mouth (it leads down the throat to the stomach) glottis – this is the opening for the trachea it is just anterior to the opening of the esophagus on the floor of the mouth tongue – found on the floor of the mouth hinged at its anterior end buccal cavity – the inside cavity of the mouth When done, you should be able to easily open the mouth to examine these internal mouth structures. Use the scissors to cut the back of the mouth where the mandible attaches to the maxilla. Open the mouth using your fingers or forceps. Skin – the outer covering of the head, truck, and appendages it is smooth and moist epidermis – the outer layer of the skin containing pigment granules for coloration dermis – the skin layer under the epidermis containing chromatophores (i.e. Appendages – the limbs that extend from the trunk including the forelimbs and hindlimbs forelimbs – short extensions from the anterior end of the trunk arm – the uppermost section of the forelimb extending from the shoulder to the elbow forearm – the middle section of the forelimb extending from the elbow to the wrist hand – the lowermost section of the forelimb extending outward from the wrist hindlimbs – long extensions from the posterior end of the trunk thigh – the uppermost section of the hindlimb extending from the hips to the knee shank – the middle section of the hindlimb extending from the knee to the ankle foot – the lowermost section of the hindlimb extending outward from the ankle digits – the fingers and toes note: there are four finger digits but five toe digits D. Trunk – the posterior end of the frog extending from the head to the hindlimbs cloacal opening – the hole at the posterior end of the frog (it’s the anus but has more functions) C. eardrum) – round membranes just posterior and ventral to the eyes B. nostrils) – two small openings on the dorsal surface of the head near the tip eyes – two eyes protrude from the head just posterior to the external nares nictitating membrane – an extension of the lower eyelid that can come up to protect the eye tympanum (i.e. Head – the anterior end of the frog extending to and including the eardrums mouth – the large opening at the anterior end of the head made up of a maxilla and mandible maxilla – the upper jaw bone mandible – the lower jaw bone external nares (i.e. Use these descriptions and the picture to identify each of the following external structures.Ī.
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