Lecture 8- Cranial nerves introduction Flashcards
how many cranial nerves
12
acronyms for learning 12 cranial nerves
On, On, On, They Travelled And Found Voldemort Guarding Very Ancient Horcruxes
On (1)
CN I- Olfactory
On (2)
CN II- Optic
On (3)
CN III- Oculomotor
They (4)
CN IV- Trochlear
Travelled (5)
CN V- Trigeminal nerve
And (6)
CN VI- Abducens
Found (7)
CN VII- Facial
Voldemort (8)
CN VIII- Vestibulocochlear
Guarding (9)
CN IX- Glossopharyngeal
Very (10)
CN X- Vagus
Ancient (11)
CN XI-Accessory
Horcruxes (12)
CN XII- Hypoglossal
Cranial nerves III – XII arise from the brain stem (Figure 1). They can arise from a specific part of the brain stem (midbrain, pons or medulla), or from a junction between two parts:
- midbrain
- midbrain -pontine junction
- pons
- pontine-medulla junction
- medulla oblongata
which cranial nerve emerge from the midbrain
trochlear IV (posterior) (longester intracranial length)
which cranial nerve emerge from the midbrain-pontine junction
oculomotor III
which cranial nerve emerge from the pons
trigeminal (V)
which cranial nerve emerge from the Pontine- medulla junction
abducens facial vestibulocochlear (VI-VIII)
which cranial nerve emerge from the medulla oblongata
posterior to the olive: glossopharyngeal, vagus, accessory (IX-XI). Anterior to the olive: hypoglossal (XII).
Tip: Cranial nerves with the number 2 in them (e.g. 2-optic and 12-hypoglossal) exit through a
canal of the same name. They are the only cranial nerves to pass through canals.
The cranial nerves are numbered by their
location on the brain stem (superior to inferior, then medial to lateral) and the order of their exit from the cranium (anterior to posterior) (Figures 1 & 2).
which cranial nerve passes throguh the cribiform plate
Olfactory (CN I)- starts at the cortex
which cranial nerve passes throguh the optic canal
optic nerve- thalamus
