Anatomy study note · Thorax

Serratus posterior muscles

Two thin, flat muscles forming the intermediate layer of the back muscles, one at the upper and one at the lower ribs.

Key points

• Superior: down and out to the upper ribs. Inferior: up and out to the lower ribs.
• Intercostal nerves.
• Probably proprioceptive more than respiratory.
• Trunk muscles: from myotomes of the somites.
• Dorsal part → dorsal-ramus muscles; ventral part → ventral-ramus muscles.
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

Origin · Insertion · Action · Nerve supply · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 4, PDF pp. 494, 503–504
• Inderbir Singh’s Human Embryology, ch. 7, PDF pp. 108–109
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the thorax

• Sternum
• Superior vena cava
• Sympathetic trunk
• Thymus
• Trachea
• Tricuspid valve
• Vagus nerve
• Aortic valve
• Arch of aorta
• Ascending aorta
• Azygos vein
• Brachiocephalic artery

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