Mastoid emissary in Indian skulls

Area of Science:

• Paleoanthropology
• Bioarchaeology
• Human Anatomy

Background:

• The mastoid emissary, a vascular channel in the skull, exhibits population-specific variations.
• Understanding these variations is crucial for anthropological and forensic studies.
• Artificial cranial deformation, common in ancient Peruvian cultures, may influence mastoid emissary characteristics.

Purpose of the Study:

• To investigate the occurrence and localization of the mastoid emissary external orifice in medieval South Peruvian Indian skulls.
• To analyze variations among three distinct populations: Villa el Salvador, Tablada de Lurin, and Paracas.
• To assess the impact of artificial cranial deformation and sex on mastoid emissary morphology.

Main Methods:

• Analysis of 211 Indian skulls from medieval South Peru.
• Examination of mastoid emissary external orifice occurrence and localization.
• Comparison of variations across three geographically distinct populations.
• Statistical analysis to identify sex-related differences and population-specific patterns.

Main Results:

• Multiple mastoid emissary orifices were common, particularly in Villa el Salvador and Paracas populations.
• Mastoid emissaries were generally located higher in Peruvian Indians compared to Europeans, notably in the Paracas group.
• Significant sex differences in mastoid emissary features were observed across the combined populations.
• Distinct population-specific differences in mastoid emissary localization were identified.

Conclusions:

• Mastoid emissary morphology shows significant variability among South Peruvian Indian populations, even with artificial cranial deformation.
• Sex dimorphism in mastoid emissaries is evident in this ancient population, consistent with European findings.
• The study highlights the importance of considering population-specific anatomical variations in anthropological research.