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Objectives: This study was conducted to investigate and describe
the topographic anatomical details of the external ear of the guinea pig
(GP).
Methods: Twenty ears were dissected with the aid of an operating
microscope and microsurgical techniques. Photographs were taken through
an operating microscope.
Results: GP’s auricula has lack of dynamic configuration. Helix
and scapha are rudimentary. External ear canal is composed of
cartilaginous ring, two osseous rings, tympanic ring and the
semispherical-shaped bulla. The mean length of the canal was 7 mm. The
widest and narrowest diameters of the canal were 4 and 3 mm respectively.
A bony dehiscence called foramen Huschke was observed in each dissection
of the canals.
Conclusion: The external ear of the GP differs than the human
external ear in many aspects. Researchers planning to study with this
animal model should be aware of all these differences. |
