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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Diagram illustrating the cutaneous innervation of the gluteal region.
Nerves of the Lower Limb

The Cutaneous Innervation of the Lower Limb

by Max Bidewell

Muscles of the Upper Limb

Muscles in the Posterior Compartment of the Forearm

by Dr Oliver Jones

Anatomy illustration showing the hard and soft palate, highlighting their role in separating the nasal cavity from the oral cavity.
The Mouth

The Palate

by Krishan Kulkarni