Practical Lab | Zoology
Frog (Rana tigrina) Dissection Manual
For: Science Class 11
File Type: PDF | File Size: 375 KB
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Inside File:
External Anatomy:
1. Place the frog on the dissecting pan. Do not pin it down.
2. Use these descriptions and the picture to identify each of the following external structures.
A. 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. 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. eardrum) ? round membranes just posterior and ventral to the eyes
B. 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. 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
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