Identify the more inferior contents of the orbit.

1. Identify the optic and nasociliary nerves and the ophthalmic artery. (G 7.38B;N 88;Gl 41.12) Attempt to identify the long ciliary, anterior ethmoidal and infratrochlear nerves. The anterior ethmoidal and infratrochlear nerves are positioned between the superior oblique and medial rectus muscles.
   Important Relationship

   • The nasociliary nerve passes directly superior to the optic nerve.
   • The nasociliary nerve (anterior ethmoidal and infratrochlear branches) passes directly superior to the medial rectus muscle and directly inferior to the superior oblique muscle.
   • The ophthalmic artery passes inferior, lateral and superior to the optic nerve.
2. Identify the medial and lateral rectus muscles. (G 7.38B;N 86;Gl 41.2) Identify the abducens nerve entering the proximal medial aspect of the lateral rectus muscle.
3. Identify the inferior rectus muscle and the inferior ramus of the oculomotor nerve. (G 7.38B;N 88;Gl 41.8)