Module 3.1 - Head and Neck (Cranial Nerves Separate)

1st Year / 1st Sem / 1st Shifting - AnaLec

CN I: Olfactory

• Cribriform Plate

• Sensory

CN II: Optic

• Optic Canal

• Sensory

CN III: Oculomotor

• Superior Orbital Fissure

• Motor

CN IV: Trochlear

• Superior Orbital Fissure (2)

• Motor

CN V: Trigeminal / V-I. Ophthalmic Division

• Superior Orbital Fissure

• Both

CN V: Trigeminal / V-II. Maxillary Divison

• Foramen Rotundum

• Both

CN V: Trigeminal / V-III. Mandibular Division

• Foramen Ovale

• Both

CN VI: Abducent

• Superior Orbital Fissure (3)

• Motor

CN VII: Facial

• Internal acoustic meatus, facial canal, stylomastoid foramen

• Both

CN VIII: Auditory/Vestibulocochlear

• Internal Acoustic meatus

• Sensory

CN IX: Glossopharyngel

• Jugular foramen

• Both

CN X: Vagus

• Jugular foramen (2)

• Both

CN XI: Accessory

• Jugular foramen (3)

• Motor

CN XIII: Hypoglossal

• Hypoglossal canal

• Motor

Sensory Cranial Nerves

• Olfactory CN l

• Optic CN ll

  • Largest nerve in the orbit

• Vestibulocochlear CNVlll

Motor Cranial Nerves

• Oculomotor CN lll

• Trochlear CN lV

  • Most slender intracranial 

• Abducent Vl

• Accessory CN Xl

• Hypoglossal CN Xll

Mixed Cranial Nerves

• Trigeminal CN V

  • Largest of cranial nerves

• Facial Vll

• Glossopharyngeal CN lX

• Vagus CN X

• Most extensive distribution

Olfactory nerve

• Function: smell

• Lesion: anosmia 

Optic nerve

• Function: acuity of vision

• Lesion: blindness 

Oculomotor

• Motor:

  • Levator palpebrae superioris

  • (Elevates eyelids)

  • Superior,Middle,Inferior recti muscles & 

  • Inferior oblique(extraocular muscles)

  • Constrictor pupillae(size of iris)

  • Ciliary muscle (accommodation)

• Lesions: Diplopia 

Trochlear

• Superior oblique 

Abducent

Lateral rectus

Trigeminal

• Largest cranial nerve

• Both Motor and Sensory in function

• 3 divisions( V-I-OPHTHALMIC, V-2-MAXILLARY, V-3 MANDIBULAR)

• Mandibular branch- Purely motor in function

  • Muscles of Mastication

Auditory/ Vestibulocochlear

• Vestibular-Position and movement

• Lesion: dizziness/vertigo

• Cochlear- Hearing

  • Lesion: Tinnitus deafness

Glossopharyngeal n.

• Motor: stylopharyngeous muscle (swallowing)

• Parasympathetic: Parotid gland

  • Sensory: general sensation & taste of posterior 1/3rd tongue

  • Carotid sinus & body

Vagus n.

• Motor: Constrictor muscle of pharynx 

  • Intrinsic muscles of larynx

  • Muscles of trachea, bronchi, heart, alimentary tract

• Sensory: taste from vallecula