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

Illustration showing the course of the ilioinguinal nerve within the lumbar plexus.
Encyclopaedia

Ilioinguinal Nerve

by Mihir Himanshu Majeethia

Diagram illustrating the course of the thoracoacromial trunk and its four terminal branches.
Encyclopaedia

Thoracoacromial Artery

by Aren Mnatzakanian

Lateral view of the neck highlighting the two heads of the sternocleidomastoid muscle innervated by the accessory nerve (CN XI).
Encyclopaedia

Sternocleidomastoid

by Dr Oliver Jones