Cranial Nerves Flashcards
What is CN(I)
State its:
Origin
What is supplies
Fibres
Function
- Olfactory nerve
- Origin - Roof of nasal cavity
- Supplies - Nasal cavity
- Fibres - Special sensory
- Function - Smell
Where does the olfactory nerve move through
The olfactory foramina of cribriform plate of the ethmoid bone
Where do the receptors of the olfactory nerve take the smell to
To the olfactory bulb from there to the brain to be aware of the smell
What is the CN(II)
State its:
- Origin
- What it supplies
- What fibres
- What function
- Optic nerve
- Origin - Retina
- Supplies - Photoreceptors
- Fibres - Special sensory
Where does the optic nerve move through
The optic canal where they get sent to occipital lobe to process what we see
What is CN(III)
State its:
- Origin
- Supplies
- Fibres
- Function
- Oculomotor nerve
- Origin - Midbrain
- Supplies - Muscles that surround the eye
- Fibres - Motor
- Function Eye movement + eyelid movement
What does the oculomotor nerve move through
Superior orbital fissure
What is the CN(IV)
State its:
- Origin
- What it supplies
- Fibres
- Function
- Trochlear nerve
- Origin - Midbrain
- Supplies - One of the ocular eye muscles
- Fibres - Motor
- Function - Eye movement
What does the trochlear nerve move through
Superior orbital fissure
What is CN(V)
State its:
- Origin
- What it supplies
- Fibres
- Function
- Trigeminal nerve
- Origin - mesencephalic nucleus (midbrain), principal pontine nucleus (pons), spinal nucleus (medulla), trigeminal motor (pons)
- Supplies - Skin, muscles of mastication, tongue (2/3rds)
- Fibres - sensory and motor (V3 only)
- Function - Sensation of touch, pain, temperature and pressure
What does the trigeminal nerve move through
- V1 - Superior orbital fissure
- V2 - Foramen rotundum
- V3 Foramen ovale
What is CN(VI)
State its:
- Origin
- What it supplies
- Fibres
- Function
- Abducens nerve
- Origin - Pons
- Supplies - Lateral rectus (remaining eye muscle)
- Fibres - Motor
- Function - Movement of the eye
What does the abducens nerve move through?
Superior orbital fissure
What is CN(VII)
State its:
- Origin
- What it supplies
- Fibres
- Function
Facial nerve
- Origin - Pons
- Supplies muscles of mastication
- Fibres - Motor + sensory
- Function - Movement to make expression, secretion, taste, touch, pain (external ear)
What does the facial nerve move through
Internal acoustic meatus and stylomestoid foramen
What is CN(VIII)
State its:
- Origin
- What it supplies
- Fibres
- Function
- Vestibulocochlear nerve
- Origin - Pons + medulla junction
- Supplies - Vestibule + Inside ear
- Fibres - Sensory (vestibule) + Motor (cochlear)
- Function - Coordinate balance, sound transmission to process
What does the vestibularcochlear nerve move through
Internal acoustic meatus
What is CN(IX)
State its:
- Origin
- What it supplies
- Fibres
- Function
- Glossopharyngeal nerve
- Origin - Medula
- Supplies - Stylopharyngeus muscle, 1/3 posterior of tongue, parotid
- Fibres - Sensory and motor
- Function - Taste, touch, pain, temp of the ear, pharynx, tongue
What does the glossopharyngeal nerve move through
Jugular foramen
What is CN(X)
State its:
- Origin
- What it supplies
- Fibres
- Function
- Vagus nerve
- Origin - Medulla
- Supplies - Heart, stomach thorax, abdomen, epiglottis, pharynx, larynx
- Fibres - Sensory + motor
- Function - Controls heartbeat, main parasympathetic nerve for rest + digest function, phonation (producing sound), swallowing
What does the vagus nerve move through
Jugular foramen
What is CN(XI)
State its:
- Origin
- What it supplies
- Fibres
- Function
- Accessory nerve
- Origin - Medulla + spinal cord
- Supplies - Muscles in neck + across shoulder
- Fibres - Motor
- Function - Flexion of the neck, contralateral head rotation
What does the accessory nerve move through
Jugular foramen
What is CN(XII)
State its:
- Origin
- What it supplies
- Fibres
- Function
- Hypoglossal nerve
- Origin - Medulla
- Supplies - Extrinsic + intrinsic muscles of tongue
- Fibres - Motor
- Function - Movement of the tongue
What does the hypoglossal nerve move through
Hypoglossal canal
