Anulus tendineus communis
Graphic representation of a left eyeball, the external eye muscles and some nerves (optic nerve, oculomotor nerve, ciliary ganglion). The anulus tendineus communis surrounds the optic nerve in a ring shape at the entrance of the bony optic nerve canal ( Canalis opticus ) and is the union of the tendons of origin of the external eye muscles. Moving over the picture shows the names of the elements.
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The annulus tendineus communis , common tendon ring or Zinn's tendon ring is a ring of tendons in the rear part of the eye socket , from which all external ocular muscles of an eye as well as the upper eyelid arise except for the lower oblique .
The tendons of origin of these skeletal muscles unite to form the anulus tendineus communis, which surrounds the optic nerve in a ring shape, just before its entry into the optic nerve canal ( canalis opticus ), and is here fused with the bone. It bridges the superior orbital fissure in two places and thus divides it into three levels, the middle of which it encloses. In addition to the four straight eye muscles, the recti muscles ( superior, medialis, lateralis and inferior ), the retractor bulbi (absent in humans), the upper oblique superior oblique muscle and the levator palpebrae superioris muscle arise from the common tendon ring .
Starting from their common tendon ring, these muscles, together with the intermuscular membrane (membrana intermuscularis) connecting them, form a truncated cone , called a muscle cone , which widens like a funnel towards the front and thus divides the eye socket into an intra-conical and an extra-conical space.
See also
literature
- Herbert Kaufmann (Ed.): Strabismus . With the collaboration of W. de Decker among others. Enke, Stuttgart 1986, ISBN 3-432-95391-7 .