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The spectacle of the ball python (Python regius): a morphological description.

Mari-Ann O Da Silva1, Steffen Heegaard, Tobias Wang

  • 1Center for Zoo and Wild Animal Health, Copenhagen Zoo, Denmark; Eye Pathology Institute, University of Copenhagen, Denmark.

Journal of Morphology
|December 31, 2013
PubMed
Summary
This summary is machine-generated.

The ball python

Keywords:
corneaepitheliumsnakestromasubspectacular space

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Area of Science:

  • Herpetology
  • Ophthalmology
  • Comparative Anatomy

Background:

  • The spectacle, a transparent scale covering the eye, is a unique feature in many reptiles.
  • Understanding its structure is crucial for reptile eye health and vision research.

Purpose of the Study:

  • To provide a detailed morphological description of the ball python (Python regius) spectacle.
  • To investigate the spectacle's layered structure, cellular composition, and thickness using advanced imaging techniques.

Main Methods:

  • Light microscopy and transmission electron microscopy of 21 ball python eyes.
  • Optical coherence tomography (OCT) and Scheimpflug scanning (Pentacam) on nine live ball python eyes.
  • Histological analysis of spectacle layers: outer epithelium, stroma, and inner epithelium.

Main Results:

  • The spectacle comprises three distinct layers: keratin-overlaid outer epithelium, collagen-rich stroma with nerves and vessels, and squamous inner epithelium with vesicles.
  • A transition zone at the spectacle rim shows increased basal cell height and less organized stroma.
  • Spectacle thickness averaged 96 ± 10 µm (histology) and 108 ± 13 µm (OCT); subspectacular space was minimal but visible peripherally via OCT.

Conclusions:

  • The ball python spectacle possesses a well-defined, three-layered structure with specific cellular and stromal organization.
  • The transition zone at the spectacle rim represents a gradual integration with periocular skin.
  • OCT provides a reliable, non-invasive method for measuring spectacle thickness and assessing the subspectacular space in live snakes.