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A unique intraorbital osseous structure in the large fruit‐eating bat ( Artibeus lituratus )
Author(s) -
Machado Marcello,
Dos Santos Schmidt Elizabeth Moreira,
Margarido Teresa Cristina,
MontianiFerreira Fabiano
Publication year - 2007
Publication title -
veterinary ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.594
H-Index - 50
eISSN - 1463-5224
pISSN - 1463-5216
DOI - 10.1111/j.1463-5224.2007.00516.x
Subject(s) - anatomy , orbit (dynamics) , soft tissue , biology , artibeus , pathology , medicine , zoology , engineering , aerospace engineering
Objective To describe the normal bony orbital structure of the large fruit‐eating bat ( Artibeus lituratus ) with emphasis on a unique intraorbital bony structure previously not described in the literature. Procedures The bony anatomy of the orbital cavity was studied on dissected skulls of large fruit‐eating bats. The anatomic description of a unique intraorbital spine was made while studying the bony orbit of macerated skulls. Additional observations were made on dissected formalin‐fixed whole heads. Both procedures were performed under a stereo dissecting microscope, using ×2–4‐magnification. A histologic analysis of soft tissues surrounding this cylindrical bony structure was performed using cross and longitudinal oblique sections from decalcified whole heads, which had been fixed in formalin. Additionally, biometric measurements and a histomorphometric analysis were performed. Results and conclusions An intraorbital cylindrical osseous structure measuring 3.96 ± 0.68 mm in length and 155.62 ± 14.03 µm in diameter was observed in the large fruit‐eating bat ( A. lituratus ), creating a unique orbital structural design among mammals. We suggest the name optic spine of the alisphenoid bone. The anatomic, biometric and histologic characterization of this element might contribute to a further understanding of the dynamics of bat vision and the sort of factors that influenced evolution of the visual system of microbats. The authors hope that the documentation of this distinctive anatomic feature will also expand the debate about the phylogenetic analysis of the relationship among bat species in the near future.