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Related Experiment Video

Updated: Jan 20, 2026

Culture of Embryonic Mouse Cochlear Explants and Gene Transfer by Electroporation
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Petrosal morphology and cochlear function in Mesozoic stem therians.

Tony Harper1, Guillermo W Rougier2

  • 1Center for Functional Anatomy and Evolution, Johns Hopkins University, Baltimore, Maryland, United States of America.

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|August 15, 2019
PubMed
Summary
This summary is machine-generated.

Fossil mammal inner ear anatomy reveals early vascular features predating high-frequency hearing. These early mammals had specialized venous drainage, but likely lacked advanced auditory capabilities.

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Area of Science:

  • Paleontology
  • Comparative Anatomy
  • Evolutionary Biology

Background:

  • Understanding the evolution of the mammalian inner ear is crucial for reconstructing the sensory capabilities of early mammals.
  • Plesiomorphic crown mammalian petrosal specimens offer unique insights into the transitional anatomy of early mammals.
  • Micro-computed tomography (micro-CT) enables detailed examination of fossilized osteological structures.

Purpose of the Study:

  • To describe the bony anatomy of the inner ear in three early mammalian petrosal specimens: Priacodon fruitaensis and two Höövör petrosals.
  • To investigate the osteological correlates of neurovascular features, particularly along the abneural wall of the cochlear canal.
  • To clarify hypotheses regarding the mosaic evolution of the cochlear endocast in early mammals.

Main Methods:

  • Micro-CT imaging of three fossil petrosal specimens (one triconodont, two stem therians) and extant mammalian taxa.
  • Detailed anatomical description of the bony labyrinth and associated structures.
  • Comparative analysis of fossil and extant mammalian inner ear anatomy.

Main Results:

  • The membranous cochlear duct adhered abneurally to a secondary bony lamina before the evolution of a primary bony lamina or tractus foraminosus.
  • Fossil stem therian inner ears show localized enlargement of the intrapetrosal venous plexus, interpreted as the vein of the cochlear aqueduct.
  • These early specimens appear to have limited high-frequency hearing capabilities.

Conclusions:

  • The development of specialized venous drainage in the cochlear endocast predates the evolution of high-frequency hearing in mammals.
  • The stria vascularis and high-frequency hearing capacity likely evolved independently or later in mammalian evolution.
  • Early mammalian inner ear evolution involved a mosaic of primitive and derived features.