# Racial Dysmorphisms of the Ear Among the Tanzanian and Indian Populations: A Cross-Sectional Study

## TL;DR

This study compares ear shapes and sizes between Tanzanian and Indian populations, finding notable differences that could impact medical and forensic practices.

## Contribution

The study provides new empirical data on ear morphological differences between two distinct populations, highlighting implications for surgery and forensics.

## Key findings

- Indian ears were generally larger than Tanzanian ears, except for certain concha measurements.
- Sexual dimorphism was more pronounced in the Indian population compared to the Tanzanian population.
- Ear position relative to facial landmarks was significantly larger in Tanzanian participants.

## Abstract

Introduction

The human ear exhibits significant morphological and morphometric variations across populations, influencing clinical practices, forensic identification, and psychosocial perceptions. This study aims to compare ear parameters between Tanzanian and Indian populations, assessing racial and sexual dysmorphisms.

Methodology

A cross-sectional study was conducted from March 2024 to February 2025 in Tanzania and India, involving 240 eligible participants aged 18-35 years (120 per country: 60 men and 60 women). Measurements, including ear length, width, lobule dimensions, concha parameters, and distances from the ear to the eye, mouth, and mandible, were taken using digital Vernier calipers and goniometers.

Results

Significant racial differences were observed in most ear parameters, with Indian ears generally larger than Tanzanian ears, except for right concha length, right concha width, and left concha width. Sexual dimorphism was more pronounced in the Indian population, with men showing larger parameters than women in most measurements, while Tanzanian men and women exhibited fewer significant differences. The ear's position relative to facial landmarks was significantly larger in the Tanzanian population. Lobule attachment types varied, with pendulous being the most common.

Conclusion

This study highlights significant differences in ear parameters between Tanzanian and Indian populations for both sexes. These variations are important, particularly in fields such as plastic and reconstructive surgery, prosthetic ear development, and otological treatments, where understanding population-specific anatomical differences is crucial for optimizing patient outcomes. In forensics, ear morphology is a reliable biometric marker for personal identification and aiding in criminal investigations and disaster victim identification.