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

Popular

Lateral view diagram of the oral muscles of facial expression, highlighting the blending of buccinator and orbicularis oris fibers.
Encyclopaedia

Orbicularis Oris

by Max Bidewell

Diagram illustrating the superior and inferior branches of the oculomotor nerve within the orbit.
The Cranial Nerves

The Oculomotor Nerve (CN III)

by Navin Leanage

Diagram illustrating the borders of the triangular interval.
Anatomical Areas

The Triangular Interval

by Dr Oliver Jones