The 3rd cranial nerve-oculomotornerve
The oculomotor nuclear complex is located in the the middbrain at the level of superior colliculus. This has one unpaired and four paired nuclear columns.
The unpaired column constitute
6th cranial nerve-Abducent nerve
The oculomotor nuclear complex is located in the the middbrain at the level of superior colliculus. This has one unpaired and four paired nuclear columns.
The unpaired column constitute
- Edinger-Westphal nucleus
- Subnucleus for levator palpebrae superioris.
- Subnuclei for superior, inferior and medial recti and inferior oblique.
- Trochlear nerve passes posteriorly and the fibres from the right and left trochlear nuclei decussate on the dorsum of mid brain.
- This is the only cranial nerve that emerges dorsally from the brainstem.
- The left trochlear nucleus sends fibres to the right superior oblique muscle and vice versa.
6th cranial nerve-Abducent nerve
- Abducent nerve has a very long intracranial course and supplies the lateral rectus muscle..
- Because of its long intracranial course, this nerve is affected in conditions producing raised intracranial tension, hence producing a false localizing sign.
