Exam II - Cranial Nerves Flashcards
Which cranial nerve provides touch sensation to the medial canthus?
Opthalmic
Which cranial nerve innervates the tongue?
Hypoglossal (motor), Mandibular (sensory), Glossopharyngeal (sensory), & Facial (sensory; taste)
Which cranial nerve innervates the upper right canine tooth?
Right Maxillary
Olfactory Nerve passes through ____________.
Cribriform plate
Optic Nerve passes through ____________.
Optic canal
Oculomotor Nerve passes through ____________.
Orbital fissure
Trochlear Nerve passes through ____________.
Orbital fissure
Opthalmic branch of Trigeminal Nerve passes through ____________.
Orbital fissure
Maxillary branch of Trigeminal Nerve passes through ____________.
round foramen and rostral alar foramen
Mandibular branch of Trigeminal Nerve passes through ____________.
oval foramen
Abducens Nerve passes through ____________.
Orbital fissure
Facial Nerve passes through ____________.
Stylomastoid foramen (motor fibers) and internal acoustic meatus
Vestibulocochlear Nerve passes through ____________.
Internal acoustic meatus
Glossopharyngeal Nerve passes through ____________.
Jugular foramen and tympanooccipital fissure
Vagus Nerve passes through ____________.
Jugular foramen and tympanooccipital fissure
Spinal Accessory Nerve passes through ____________.
Jugular foramen and tympanooccipital fissure
Hypoglossal Nerve passes through ____________.
Hypoglossal canal
Olfactory nerve: sensory or motor?
Sensory (smell) from olfactory epithelium
Optic nerve: sensory or motor?
Sensory (vision) from retina
Oculomotor nerve: sensory or motor?
Motor to D, M, & V rectus mm., ventral oblique and levator palpebrae superioris m. Parasympathetic to ciliary ganglion (iris sphincter m.)
Trochlear nerve: sensory or motor?
Motor to dorsal oblique m.
Opthalmic branch of trigeminal nerve: sensory or motor?
Sensory from globe, periorbita, nasal mucosa, medial aspect of palpebrae
Maxillary branch of trigeminal nerve: sensory or motor?
Sensory from upper lip, nasal mucosa, lateral aspect of palpebrae
Mandibular branch of trigeminal nerve: sensory or motor?
Both. SENSORY from lower jaw, tongue (taste and touch from rostral 2/3) and auriculotemporal area and MOTOR to muscles of mastication
Abducens nerve: sensory or motor?
Motor to retractor bulbi m. and lateral rectus m.
Facial nerve: sensory or motor?
Both. MOTOR to muscles of facial expression and SENSORY (taste) from the rostral 2/3 of the tongue Parasympathetic to salivary and lacrimal glands
Vestibulocochlear nerve: sensory or motor?
Sensory for hearing and balance
Glossopharyngeal nerve: sensory or motor?
Both. SENSORY from the tongue (taste to caudal 1/3) and pharyngeal mucosa (touch) and MOTOR to the pharynx Parasympathetic to parotid and mucosal glands
Vagus nerve: sensory or motor?
Both. Some MOTOR to larynx, pharynx, and esophagus. SENSORY to ear canal and epiglottis. PARASYMPATHETIC to heart, lungs, and abdomen.
Spinal Accessory nerve: sensory or motor?
MOTOR to trapezius, omotransversarius, sternocephalicus, and cleidocephalicus. Also motor to larynx via recurrent laryngeal n.
Hypoglossal nerve: sensory or motor?
MOTOR to extrinsic and intrinsic mm of the tongue
Which cranial nerve is responsible for the pupillary constriction reflex?
CN III: Occulomotor nerve. The PNS to iris sphincter muscles are responsible for the reflex
Which nerve runs with the lingual artery?
Hypoglossal n.
Which nerve comes down the neck and terminates on the trapezius muscle?
CN XI: Spinal Accessory nerve
Which cranial nerves have parasympathetic fibers?
CN III: Occulomotor CN VII: Facial CN IX: Glossopharyngeal CN X: Vagus
Which cranial nerve provides motor innervation to the dorsal oblique m?
Trochlear n.
Which cranial nerve provides sensory innervation for hearing and balance?
Vestibulocochlear n.
Which cranial nerve provides motor innervation to the pharynx?
Glossopharyngeal n.
Which cranial nerve provides motor innervation to the retractor bulbi m and lateral rectus m?
Abducens n.
Which cranial nerve provides parasympathetic innervation to the heart, lungs, and abdomen?
Vagus n.
Which cranial nerve has sensory innervation from the upper lip, nasal mucosa, and lateral aspect of palpebrae?
Maxillary branch of Trigeminal n.
Which cranial nerve has sensory innervation from the globe, periorbita, nasal mucosa, and medial aspect of palpebrae?
Opthalmic branch of Trigeminal n.
Which cranial nerve has sensory innervation from the lower jaw, tongue, and auriculotemporal area?
Mandibular branch of Trigeminal n.
Which cranial nerve(s) demonstrate(s) both MOTOR and SENSORY innervation?
- Trigeminal n (CN V)
- Facial n (CN VII)
- Glossopharyngeal n (CN IX)
- Vagus n (CN X)
Name the cranial nerve(s) that pass(es) through the jugular foramen and tympanooccipital fissure
- Glossopharyngeal n. (CN IX)
- Vagus n. (CN X)
- Spinal Accessory n. (CN XI)
(Cranial nerves 9, 10, & 11)

Name the cranial nerve(s) that pass(es) through the hypoglossal canal
Hypoglossal n. (CN XII)
(hypoglossal n. is #2 in photo)

Name the cranial nerve(s) that pass(es) through the oval foramen
Mandibular br. of Trigeminal n. (CN V)

Name the cranial nerve(s) that pass(es) through the optic canal
Optic n. (CN II)
(Optic canal is #1 in photo)

Name the cranial nerve that passes through the round foramen and rostral alar foramen
Maxillary br. of Trigeminal n. (CN V) & maxillary a.
(rostral alar foramen is #3 in picture)

Name the cranial nerve(s) that pass(es) through the internal acoustic meatus
- Facial n. (CN VII)*
- Vestibulocochlear n. (CN VIII)
*Facial n. also passes through stylomastoid foramen

Which cranial nerve(s) demonstrate only sensory (not motor) innervation?
- Olfactory
- Optic
- Vestibulocochlear
Which cranial nerve(s) demonstrate(s) only motor (not sensory) innervation?
- Oculomotor
- Trochlear
- Abducens
- Spinal Accessory
- Hypoglossal
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Which cranial nerve(s) demonstrate both sensory & motor innervation?
- Trigeminal
- Facial
- Glossopharyngeal
- Vagus
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All of the muscles of mastication are going to be innervated by which cranial nerve.
Where does this nerve pass through?
Mandibular br. of Trigeminal n. (CN V)
oval foramen

Platysma m., Orbicularis oculi m., orbicularis oris m., levator nasolabialis m., and buccinator m. are all innervated by which cranial nerve?
Facial n. (CN VII)
The cribriform foramina and the cribriform plate are associated with which cranial nerve?
CN1 - Olfactory n.
The oculomotor n. (CN III) provides parasympathetic innervation to which muscle?
iris sphincter m. (pupillary constriction)
The dorsal, ventral, and medial rectus mm. are innervated by which nerve?
Occulomotor n. (CN III)

The ventral oblique m. is innervated by which nerve?
CN III - Occulomotor n.

The levator palpebrae superioris m. is innervated by which nerve?
CN III - Occulomotor n.

The dorsal oblique m. is innervated by which nerve?
CN IV - Trochlear n.

What is the only branch of Trigeminal n (CN V) that has motor innervation?
Mandibular branch of Trigeminal n. has both sensory and motor
The lateral rectus and retractor bulbi mm. are innervated by which nerve?
Where does this nerve pass through?

CN VI: Abducens
Passes through the orbital fissure

The caudal belly of the digastricus m. is innervated by which nerve?
CN VII - Facial n.
Which nerve provides innervation to the mandibular arcade?
Inferior alveolar n.
(from the mandibular branch of Trigeminal n)
Which nerve provides innervation to the maxillary arcade?
maxillary n.
The **foramen lacerum **in the equine is the equivalent of which foramina in the dog?
Why is this important?
foramen lacerum = oval foramen + jugular foramen
**For facial nerves, the nerves that go through the oval foramen in the dog, for instance, would go through the foramen lacerum in the horse.