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Bifid rib: anatomical considerations in three cases.

Wu-Chul Song¹, Sang-Hyun Kim, Dae-Kyoon Park

¹Department of Anatomy, School of Medicine, Konkuk University, Gwangjin-Gu, Seoul, Korea.

Yonsei Medical Journal

|May 12, 2009

Summary

This study details 3 cases of bifid rib, a rare anatomical variation. Understanding bifid rib anatomy is crucial for diagnosing chest anomalies and differentiating them from conditions like tumors or fractures.

Keywords:

Bifid rib anatomy development variation

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Area of Science:

Anatomy
Human Anatomy
Thoracic Anatomy

Background:

Bifid rib is a rare congenital anomaly with limited detailed anatomical studies.
Understanding variations in rib structure is essential for thoracic surgery and diagnostics.

Observation:

Three cases of bifid right fourth rib in male cadavers were analyzed.
Observed significant narrowing of upper intercostal spaces and widening of lower spaces.
Intercostal muscles were present within the bifid space in all observed cases.

Findings:

Bifid ribs were classified into two types based on anatomical features.
The internal thoracic artery supplied the bifid space via the third anterior intercostal artery.
The fourth intercostal nerve and a branch from the third intercostal nerve innervated the bifid space muscles.

Implications:

Accurate anatomical knowledge of bifid ribs aids in differential diagnosis of chest wall pathologies.
This malformation requires consideration in radiological interpretations to avoid misdiagnosis.
Awareness of bifid rib variations is important for clinicians and radiologists involved in thoracic imaging and surgery.