Anatomy study note · Head and neck

Common tendinous ring

The fibrous ring on the back wall of the orbit surrounding the optic canal, from which the four rectus muscles arise.

Key points

• Origin of the 4 recti.
• Surrounds the optic canal/foramen.
• Superior oblique arises nearby; inferior oblique from the orbital floor.
• Connective tissue: from leftover mesenchyme.
• Tendinous ring: dense regular CT.
• Ligament/tendon: dense regular CT — parallel collagen bundles.

The full note in the atlas also covers

Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 12, PDF p. 1589
• Inderbir Singh’s Human Embryology, ch. 7, PDF pp. 94–95
• BRS Cell Biology & Histology, 7th ed., ch. 6, PDF pp. 110–111

More from the head and neck

• Cornea
• Corniculate and cuneiform cartilages
• Corpus callosum
• Corpus striatum
• Cricoid cartilage
• Cricothyroid
• Deep cervical lymph nodes
• Digastric
• Dura mater
• Dural venous sinuses
• Epiglottis
• Ethmoid

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