4: Cranial Nerves & Autonomics of the H & N Flashcards
What are the 5 fibre types of Cranial Nerve?
- Motor fibres to voluntary (striated) muscle
- Motor fibres innervating involuntary muscles and glands
- Sensory (afferent) fibres: General transmission from skin and mucus membrane
- Sensory (afferent) fibres carrying sensation from viscera
- Sensory (afferent) fibres transmit unique SPECIAL sensory sensation
What fibre type is the Olfactory Nerve (CN 1)?
Special Sensory (5)
What does the Olfactory Nerve (CN 1) control?
Sense of smell
Where does the Olfactory Nerve (CN 1) originate?
Cerebrum
What is the Cranial exit of the Olfactory nerve (CN 1)?
Cribriform plate
How is the Olfactory Nerve (CN 1) tested?
Testing smelling
What fibre type is the Optic Nerve (CN 2)?
Special Sensory (5)
What is the origin of the Optic Nerve (CN 2)?
Cerebrum
What is the cranial exit of the Optic nerve (CN 2)?
Optic canal
What is the function of the Optic nerve (CN 2)?
Vision
How is the Optic nerve (CN 2) tested?
Pupil responses to light
What fibre type is the Occulomotor Nerve (CN 3)?
Motor (1) & (2)
To Voluntory + Invol muscles
What is the origin of the Occulomotor Nerve (CN 3)?
Midbrain of brainstem
What is the cranial exit of the Occulomotor Nerve (CN 3)?
Superior Orbital Fissure
What is the function of the Occulomotor Nerve (CN 3)? ( 2 things)
- Motor (1 Vol): Extrinsic eye muscles & levator palpebrae
- Motor (2 Invol): Pupillary sphincter

How is the Occulomotor Nerve tested?
Test movements of eye
What fibre type is the Trochlear Nerve (CN 4)?
Motor (1 Vol)
What is the origin of the Trochlear Nerve (CN 4)?
Midbrain of brainstem
What is the cranial exit of the Trochlear Nerve (CN 4)?
Superior orbital fissure
What is the function of the Trochlear Nerve (CN 4)?
Sup oblique muscle of eye
How is the Trochlear Nerve (CN 4) tested?
Test movements of eye
What is the fibre type of the Trigeminal Opthalmic Nerve (CN V1)?
Motor (2 Invol)
What is the origin of the Trigeminal Opthalmic Nerve (CN V1)?
Pons
What is the cranial exit of the Trigeminal Opthalmic Nerve (CN V1)?
Sup orbital fissure





















