Cranial nerves related to orbit.

1. Optic nerve

- through optic canal.

- innervates eye ball

2. Oculomotor nerve ( CN3/III)

-branches - Superior div. - superior rectus

- levator palpebrae superioris muscles

- Inferior div - medial rectus

- inferior rectus

- inferior oblique rectus

- branch to ciliary ganglion

3. Trochlear nerve ( CN4/IV)

- innervates superior oblique muscle.

4. Opthalmic nerve ( CN5/ V)

- 3 branches :-

a) Lacrimal branch

b) Frontal branch :-

- Supratrochlear nerve.

- Supraorbital nerve.

c) nasociliary branch :-

- communicating branch to ciliary ganglion

- long ciliary nerves

- ( anterior & posterior) ethmoidal cells.

- infratrochlear nerve

5. Abducens Nerve ( CN6/VI)

- innervates lateral rectus muscle.

6. Ciliary Ganglion

- receives fibers from oculomotor nerve ( preganglionic parasympathetic fibres)

- send fibers to short ciliary nerves (postganglionic parasympt. fibre) - supply sphincter papillae and ciliary muslce ( ma fi dilater papillae okay)

7. Number of sympathetic fibers

-pass through from internal carotid plexus into orbit without synpasing ganglion.

I hate this part right here.