Muscles of the Thorax

Overview

Muscles of the thorax play essential roles in respiration, posture and protection of thoracic organs. This section introduces the major muscular components responsible for ventilatory movement and thoracic wall integrity.

Key Structures

Topics include the muscles of the thoracic cage, which facilitate rib movement during breathing, and the diaphragm, the primary muscle of respiration. Each page describes attachments, nerve supply and function.

Clinical Relevance and Learning Focus

Understanding thoracic muscle anatomy aids in evaluating respiratory dysfunction, chest wall pain and diaphragmatic abnormalities. It provides a foundation for clinical examination and interpretation of imaging.

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Diagram of the diaphragm showing its two lobes (left and right) and the vertebral attachments (left and right crura).

The Diaphragm

Diagram illustrating the external and internal intercostals muscles of the thoracic wall.

The Muscles of the Thoracic Cage

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Illustration of the tendinous borders of the anatomical snuffbox, highlighting key tendons.
Anatomical Areas

The Anatomical Snuffbox

by Dr Oliver Jones

Sagittal section illustration of the dural venous sinuses and the great cerebral vein.
Blood Vessels and Cerebrospinal Fluid

The Dural Venous Sinuses

by Dr Charissa Jansen

Diagram of the Gracilis muscle located in the medial thigh.
Encyclopaedia

Gracilis

by Dr Oliver Jones