Cranial nerves I-V Flashcards
Olfactory nerve I
It only has special sensory for *olfaction.
The axons from the olfactory track travel to multiple cortical regions including the __________.
medial temporal lobe
Olfactory nerve is located in the _________.
cerebrum
Optic nerve (II)
Has special sensory: vision
What houses the optic chiasm?
*sulcus chiasmatis
The optic nerve carries sensory information from the neural retina to the _________ and ___________.
*diencephalon (lateral geniculate body) and
*midbrain (midbrain nuclei)
The ________ is the anatomical site where the axons arising from the nasal (medial) half of the retina cross the midline to the contralateral side.
*Temporal retina axons stay ipsilateral.
optic chiasm
After the optic chiasm, the same axons coming from the optic nerve are now called ___________.
optic tract
The oculomotor nerve (III) enter the ocular cavity via the _________.
superior orbital fissure
Oculomotor nerve (III)
Comes from the *midbrain
Has two branches: 1) superior ramus 2) inferior ramus
- It gets its sensory axons from communicating with the _____1_____ nerve in the superior orbital fissue.
- It gets its postganglionic sympathetic axons from communicating with the ____2______ nerve in the cavernous sinus.
- It has its motor axons from its oculomotor nucleus in the midbrain.
- The Edinger-Westphal nucleus in the midbrain provides the preganglionic parasympathethic axons.
1-ophthalmic nerve
2-internal carotid plexus
Superior ramus of oculomotor nerve
Sensory (communication from the ophthalmic nerve in the superior orbital fissure), postglanglionic sympathetic (from the internal carotid plexus in the cavernous sinus) and motor (lmn) innervation (from oculomotor nucleus of the midbrain) to the _______ and _______ muscles.
***No preganglionic parasympathetic at the level of the superior ramus**
superior rectus; levator palpebrae superioris
Grant-794
Inferior ramus of oculomotor nerve
Sensory (from the ophthalmic nerve in the superior orbital fissure), postglanglionic sympathetic (from the internal carotid plexus in the cavernous sinus) and motor (lmn) innervation (from oculomotor nucleus of the midbrain) to the _______ and _______ and _________ muscles.
inferior oblique, medial rectus, and inferior rectus
pg. 795
Oculomotor nerve (III)
The Edinger-Westphal nucleus in the midbrain gives the ___________ axons that travel with the inferior ramus and then to the ciliary ganglion, from here the postganglionic parasympathetic axons travel with the short ciliary nerve (branch of the ophthalmic division of the trigeminal nerve) to innervate the *ciliary body (ciliary smooth muscle) and ____________.
preganglionic parasympathetic; (pupillary) constrictor muscle of the iris
During the accomodation reflex, the lens ________ due to parasympathetic innervation. Also, parasympathetic innervation constrict the pupil by acting on the pupillary constrictor fibers.
thicken
Parasympathetic communication to the ciliary ganglion
Preganglionic parasympathetic innervation (axons coming from EWN) get to the ciliary ganglion (consisting of postganglionic parasympathetic bodies) then the postganglionic parasympathetic axons travel with the ____1_____ nerve, and innervate the _____2____ and _____3_____ muscle of the iris.
1- short ciliary nerve
2- ciliary body (for accomodation reflex)
3- constrictor (pupillary)
The short ciliary nerve is a branch of the _______ division of the trigeminal nerve.
ophthalmic
Trochlear nerve (IV)
Comes from dorsal midbrain
Traverses the superior orbital fissure to enter ocular cavity
- It gets its sensory axons from communicating with the _____1_____ nerve in the superior orbital fissue.
- It gets its postganglionic sympathetic axons from communicating with the ____2______ nerve in the cavernous sinus.
- It has its motor axons from its trochlear nucleus in the midbrain.
1-ophthalmic nerve
2- internal carotid plexus
superior oblique muscle
Trochlear nerve (IV)
Sensory, postganglionic sympathetic, and motor (lmn) innervation (from trochlear nucleus in the midbrain) to the ______ muscle.
Superior oblique
Trigeminal nerve (V)
Major sensory nerve of the head
Has 3 branches:
1-Ophthalmic
2-Mandibular
3- Maxillary
Trigeminal nerve comes from the _______
pons
The trigeminal ganglion is located outside of the pons.
Ophthalmic nerve
General sensory (naturally)
-No *motor axons run with it.
Postganglionic sympathetic axons from the internal carotid plexus in the cavernous sinus.
Ophthalmic nerve
Sensory, postganglionic sympathetic innervation of the skin (__1____, ____1_, ___1____), ___2_____, mucosa (nasal cavity), and **extraocular muscles.
1-forehead, upper lid, nose
2-Cornea
The ophthalmic nerve (of the trigeminal nerve) comes to the ocular cavity through the ________ .
superior orbital fissure
Lacrimal nerve (of the ophthalmic branch of the trigeminal nerve)
-Shortest
F- sensory & postganglionic sympathetic [communication from the internal carotid plexus in the cavernous sinus] innervation of the _____1_____ and the skin overlying the lateral aspect of the ____2_____, and forehead.
PLUS **postganglionic parasympathetic innervation of the ____1______ [communication from the *pterygopalatine ganglion via the zygomatic nerve, of the maxillary nerve.)
1- lacrimal gland
2- upper lid
Frontal nerve
-largest
Has 2 branches
1-Supraorbital nerve
2-Supratrochlear nerve
Supraorbital nerve (branch of frontal nerve)
Exits through *Supraorbital foramen
function- sensory & postganglionic sympathetic [communication from the internal carotid plexus in the cavernous sinus] innervation of the skin overlying the ____1____ & _________ of *frontal sinus
1- forehead
2-mucosa