Week 2 - Cranial Nerves Flashcards
Where does CN I open into base of skull?
Cribriform plate in ethmoid bone
Where does CN II open into base of skull?
Optic canal
Where does CN III open into base of skull?
Superior orbital fissure
Where does CN IV open into base of skull?
Superior orbital fissure
Where does CN V1 open into base of skull?
Superior orbital fissure
Where does CN V2 open into base of skull?
Foramen rotundum
Where does CN V3 open into base of skull?
Foramen ovale
Where does CN VI open into base of skull?
Superior orbital fissure
Where does CN VII open into base of skull?
Internal acoustic meatus
Where does CN VIII open into base of skull?
Internal acoustic meatus
Where does CN IX open into base of skull?
Jugular foramen
Where does CN X open into base of skull?
Jugular foramen
Where does CN XI open into base of skull?
Jugular foramen
Where does CN XII open into base of skull?
Hypoglossal canal
What is 1?
Olfactory
What is 5?
Trigeminal
What is 4?
Trochlear
What is 3?
Oculomotor
What is 2?
Optic
What is 7?
Facial
What is 8?
Vestibulocochlear
What is 6?
Abducent
What is 12?
Hypoglossal
What is 10?
Vagus
What is 9?
Glossopharyngeal
What is 11?
Accessory
What type of fibres are present in cranial nerve I?
Special sensory
What type of fibres are present in cranial nerve II?
Sensory
What is the pathway of the optic nerve?
Optic nerve, optic chiasma, optic tract, lateral geniculate nucleus (LGN) and optic radiation
What type of fibres are present in cranial nerve III?
Motor and parasympathetic
What type of fibres are present in cranial nerve IV?
Motor
What type of fibres are present in cranial nerve VI?
Motor
What type of fibres are present in cranial nerve V?
Ophthalmic - sensory
Maxillary - sensory
Mandibular - sensory and motor
What type of fibres are present in cranial nerve VII?
Sensory, motor and parasympathetic
What type of fibres are present in cranial nerve VIII?
Sensory
What type of fibres are present in cranial nerve IX?
Motor, sensory and parasympathetic
What type of fibres are present in cranial nerve X?
Sensory, motor and parasympathetic
What plexus does cranial nerve X form?
Oesophageal plexus
What 2 branches of cranial nerve X innervate the muscles of the pharynx?
Mainly recurrent laryngeal nerve
But cricothyroid muscles by external laryngeal nerve
What is 2 branches of mandibular nerve that supply jaw?
Inferior alveolar nerve
Lingual nerve - above IAN
What type of fibres are present in cranial nerve XI?
Motor
What type of fibres are present in cranial nerve XII?
Motor
What nerves have a parasympathetic component?
III, VII, IX and X
What cranial nerves are attached directly to brain?
Olfactory and optic
What cranial nerves are attached to midbrain?
Oculomotor and trochlear
What is the only cranial nerve to leave posterior aspect of brain?
Trochlear
Which cranial nerve is attached to pons?
Trigeminal
What cranial nerves leave the pontomedullary junction?
Abducent, facial and vestibulocochlear
What cranial nerves are attached to medulla?
Glossopharyngeal, vagus, accessory and hypoglossal
What cranial nerve can be tested in pupillary light relflex?
Oculomotor
Which nerve can be tested by touch over surface of cheek?
Maxillary - trigeminal nerve
What cranial nerve is tested when patient sticks out tongue?
Hypoglossal nerve