Saturday, April 16, 2011

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.

4 comments:

Anonymous said...

thankz for the info. really appreciate it

syauqah wardah said...

oke sedang belajar benda yg sama! :)

Harishah Halim said...

mcm x ikut sequence je?

W M Najib said...

anon, no problem.

syauqah, ohh. what a coincdnce. good luck ye! payah gak part ni.


harishah, yeke. tak sure plak. main letak je based on dr's slides.