ATTACHEMENTS OF THE NERVES :
- Forebrain - I , II
- Mid brain - III , IV
- Pons - V , VI , VII , VIII
- Medulla - IX , X , XI , XII
Lets talk about the individual nerve :
CN I - OLFACTORY NERVE :
Origin :Forebrain
Exit :Cribriform plate
Modality :Sensory
Function :Smell
CN II - OPTIC NERVE :
Origin :Forebrain
Exit :Optic canal
Modality :Sensory
Function :Vision
CN III - OCCULOMOTOR NERVE :
Origin :Mid brain
Exit :Superior orbital fissure
Modality :Motor
Function :
- It innervates muscles of eye movements such as
-Inferior oblique
-Superior rectus
-Inferior rectus
-Medial rectus
- It also innervate cilliary muscles - responsible for accomodation [ability of the eye to focus far and near objects]
CN IV - TROCHLEAR NERVE :
Origin :Mid brain
Exit :Superior orbital fissure
Modality :Motor
Function :It innervate Superior oblique muscle
CN VI - ABDUCENT NERVE :
Origin :Pons
Exit :Superior orbital fissure
Modality :Motor
Function :It abduct the eye by innervating Lateral rectus muscle
[NOTE : Cranial nerve for movement of eye ball - occulomotor ,trochlear and abducent nerve]
CN V - TRIGEMINAL NERVE :
Origin :Pons and medulla
Divisions :
- Opthalmic
- Maxillary
- Mandibular
Exit :
- Opthalmic - Superior orbital fissure
- Maxillary - Foramen rotundum
- Mandibular - Foramen ovale
Modality :Sensory and Motor
Function :
Sensory :
- Opthalmic nerve -V1
- Maxillary nerve - V2
- Mandibular nerve - V3
Motor :
V3 - Mandibular nerve supplies muscles of Mastification they are
- Masater
- Temporalis
- Medial pterihyoid
- Lateral pterihyoid
CN VII - FACIAL NERVE :
Origin :Pons
Exit :Stylomastoid foramen
Modality :Motor and Sensory
Function :
Motor :
-Facial nerve suppies to the muscles of facial expression by dividing into five branches
-It also supplies to secretary glands such as
- lacrimal gland
- Sublingual gland
- Submandibular gland
Taste sensation from Anterior two third of the tongue
CN VIII - VESTIBULO COCLEAR NERVE :
Origin :Junction of medulla and pons
Exit :Internal acoustic meatus
Modality :Sensory
Function :Hearing and balance
CN IX - GLOSOPHARNGEAL NERVE :
Origin :Medulla
Exit :Jugular foramen
Modality :Motor and Sensory
Function :
SENSORY : Taste sensation from posterior one third of Tongue
MOTOR :
- It innervate Parotid gland
- It initiate gag reflex [contraction of the back of the throat triggered by an object touching the roof of your mouth, the back of your tongue, the area around your tonsils, or the back of your throat.]
CN X - VAGUS NERVE :
Origin :Medulla
Exit :Jugular foramen
Modality :Motor and Sensory
Function :
- Motor and sensory for viseral organs like heart, lungs and digestive system
- It stimulate rest and digestive response
CN XI - SPINAL ACCESORY NERVE :
Origin :Medulla
Exit :Jugular foramen
Modality :Motor
Function :Motor for Sternocleido mastoid and trapezious
CN XII - HYPOGLOSSAL NERVE :
Origin :Medulla
Exit :Hypoglossal canal
Modality :Motor
Function :Motor for Tongue
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