This is a draft cheat sheet. It is a work in progress and is not finished yet.
1. Cranial Nerve I (Olfactory Nerve)
▪ Type: Sensory.
▪ Function: Smells.
▪ Results of lesions: Anosmia.
▪ Only cranial nerve without thalamic relay to cortex. |
|
2. Cranial Nerve II (Optic Nerve)
▪ Type: Sensory.
▪ Function: Sight.
▪ Results of lesions:
- Visual field deficits (Anopsia).
- Loss of light reflex. |
|
3. Cranial Nerve III (Oculomotor nerve):
* The oculomotor nerve (III), trochlear nerve (IV), and abducens nerve (VI) coordinate eye movement.
* Type: motor.
* Innervates all extraocular muscles (EXCEPT SO4 & LR6) as superior rectus (SR), inferior rectus (IR),
medial rectus (MR) and inferior oblique (IO).
* The action of the ocular muscles innervated by oculomotor nerves is elevation and adduction of the eye
(up and in), and the most important action is adduction
*- CN III has both Motor (Middle) and Parasympathetic (Peripheral) components.
* lesion of oculomotor nerve will result in:
1. down and out eye position (diplopia & external strabismus)
2. ptosis (drooping of the eyelid).
3. mydriasis & loss of light reflex
4. loss of accommodation (near response). (loss of Convergent)
5. Divergent |
|
