Cranial Nerves II Flashcards
Trochlear nerve is CN ___
IV
CN IV contains only these types of fibers
General Efferent (GE) fibers
CN ___ provides ___ fibers to the ______
IV, GE, superior oblique muscle
CN IV nuclei are located in the ____ at the level of______
midbrain, the inferior colliculi
CN IV originates in the ______ aspect of the _____
dorsal, midbrain
CN IV exits the midbrain _____
dorsally
After exiting midbrain, CN IV will ______ and course (ant/post)_____
cross over, anteriorly
CN IV will exit the cranial cavity via the _____
superior orbital fissure
The trochlear nerve is vulnerable to
trauma
CN V is
Trigeminal Nerve
CN __ provides sensory information from most of the head and neck structures
V, Trigeminal Nerve
Trigeminal nerve is a (motor/sensory) nerve
sensory
What are the 3 divisions of the Trigeminal nerve?
Ophthalmic
Maxillary
Mandibular
CN V1 is
Ophthalmic nerve
CN V2 is
Maxillary nerve
CN V3 is
Mandibular nerve
The ophthalmic nerve (CN ____) exits the cranial cavity via
V1, Superior orbital fissure
The Maxillary nerve (CN ____) exits the cranial cavity via
V2, Foramen rotundum
The Mandibular nerve (CN ____) exits the cranial cavity via
V3, Foramen Ovale
Name the 4 Parasympathetic Ganglia suspended by the Trigeminal Nerve
Ciliary ganglion
Pterygopalatine ganglion
Otic ganglion
Submandibular ganglion
Branches of the Trigeminal nerve carry hitchhiking \_\_\_\_\_\_\_\_\_\_ that emerge from these 4 ganglion Ciliary ganglion Pterygopalatine ganglion Otic ganglion Submandibular ganglion
post-ganglionic parasympathetic
_____ fibers allow for sensation for head and neck structures
General Afferent (GA)
_____ fibers allow for motor innervation to muscles of mastication and tensor tympani muscle of the middle ear
General Efferent (GE)
Trigeminal nerve exits out of the
Lateral pons
After exiting the lateral pons, the trigeminal nerve creates the ___
trigeminal ganglion
From the trigeminal ganglion, the trigeminal nerve forms the
3 branches (V1, V2, V3)
The trigemnial nerve carry ___ fibers for motor innervation of some striated muscles
General Efferent (GE)
CN __ is the abducens nerve
VI
Abducens nerve contains what kind of fibers?
General Efferent
CN VI is the
Abducens nerve
Abducens nerve innervates the
lateral rectus muscle
The nucleus of CN VI is located where?
in the dorsal pons
CN VI exits the brainstem at what location?
Junction of pons and medulla (pontomedullary junction)
CN VI exits the cranial cavity via the
Superior orbital fissure
Innervation of the lateral rectus muscle is done by CN __ and it allows for (voluntary/involuntary) control of (adduction/abduction)
VI, voluntary, abduction
Once exiting the pontomedullary junction, CN VI climbs up the
clivus of the occipital bone
This nerve is susceptible to being damaged by intracranial pressure around the clivus
Abducens nerve
CN ____ Facial Nerve
VII
Facial nerve emerges from the ____
brainstem at the pontomedullary junction laterally
The nuclei of CN VII is located where
Caudal pons
CN VII exits the cranial cavity via the
internal acoustic meatus
After leaving the internal acoustic meatus, the facial nerves travels in the _____ of the petrous part of the temporal bone
facial canal
What kind of fiber(s) does the facial nerve have?
GA
VE
SA
GE
____ fibers innervate muscles of facial expression and scalp, stapedius muscle of middle ear, stylohyoid muscle, posterior belly of digastric muscle
GE
___ fibers innervate the lacrimal gland, submandibular gland, sublingual gland, glands of nose and palate
VE
___ fibers innervate the anterior 2/3 of the tongue for taste
SA
___ fibers provide general sensation from skin part of the auricle and from a small area behind the ear
GA
Motor fibers of the facial nerve exit via the
stylomastoid foramen
