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 of the extrinsic muscles of the tongue, excluding the palatoglossus muscle.
Encyclopaedia

Genioglossus

by Max Bidewell

Lateral anatomical illustration of the neck showing the color-coded thyrocervical trunk and its branches, with a legend identifying the subclavian and thyrocervical trunk, inferior thyroid, ascending cervical, transverse cervical, and suprascapular arteries.
Encyclopaedia

Inferior Thyroid Artery

by Emily West

Illustration of the quadratus lumborum muscle in the posterior abdominal wall.
Encyclopaedia

Quadratus Lumborum

by Aren Mnatzakanian