Cranial Nerves Flashcards by Jessica Lahrs

What canal does the optic nerve enter?

Optic canal

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Does the optic nerve (CNII) have any branches?

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What is the function of CN II, Optic Nerve?

Retina, vision

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What is the fiber type in the optic nerve?

Special sensory

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What foramen does the oculomotor nerve (CN III) enter?

Superior orbital fissure

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Does the oculomotor CN III have any branches?

Yes, two:

1) Superior branch
2) Inferior Branch

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What are the general somatic functions of oculomotor nerver (CN III)?

1) Superior Rectus
2) Levator palpebrae superioris
3) Medial rectus
4) Inferior rectus
5) inferior oblique

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What are the parasympathetic functions of the oculomotor nerve?

1) Sphincter pupillae
2) Ciliary muscle

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What foramen does the trochlear nerve enter?

superior orbital fissure

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Does trochlear nerve (CN IV) have any branches?

Yes, muscular branch

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What if the function of trochlear?

General somatic motor:

1) Superior oblique

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What foramen do the three branches of trigeminal exit?

V1 (opthlamic): Sup orbital fissure

V2 (maxillary): foramen rotundum

V3 (mandibular): foramen ovale

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What are the three branches off trigeminal?

V1: opthalmic

V2: maxillary

V3: mandibular

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What are the four branches of of opthalmic (V1)?

(branch off Trigeminal CN V)

1) Meningeal
2) Frontal
3) Lacrimal
4) nasociliary

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What are the six branches of of V2 maxillary?

(Branch of of Trigeminal CN V)

1) Meningeal
2) Infraorbital
3) Post/ant superior alveolar
4) Zygomatic
5) Sensory roots to pterygopalatine ganglio
6) Greater/lesser palatine

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What are the 5 branches of of V3 Mandibular?

(A branch off of Trigeminal CN V)

1) Meningeal
2) Auriculotemporal
3) Buccal
4) Lingual
5) Inferior alveolar

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What are the functions of V1- opthlamic? (Sensory)

(A branch of Trigeminal CN V)

1) Meninges
2) Orbit-cornea conjuctiva
3) Nasla cavity lining
4) Forehead
5) middle nose
6) frontal air sinuses

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What are the functions of V2- maxillary (Sensory)?

(A branch of of Trigeminal CN V)

1) meninges
2) maxillary air sinus
3) gums/teeth of upper jaw
4) bony part of cheek

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What are the functions of Mandibular (V3) (sensory)?

(A branch off of Trigeminal CN V)

1) Meninges
2) Mucosa of oral cavity/palate
3) Ant 2/3 of tongue (general)
4) Gums/teeth of lower jaw
5) Soft part of cheek/mandible

What are the functions of V3 mandibular (motor)?

(A branch off of CN V Trigeminal)

1) Masseter
2) Buccinator
3) Lateral pterygoid
4) Medial pterygoid
5) tensor tympani
6) tensor palatini
7) mylohyoid
8) ant belly of digastric

What foramen does abducens (CN VI) enter?

Superior orbital fissure

What is the function of Abducens CN VI?

General Somatic motor:

1) lateral rectus

Does abducens CN VI have any branches?

What foramen does Facial nerve (CN VII) exit?

Internal acoustic meatus

What are the four fiber types in facial nerve (CN VII)?

Special Sensory General sensory Branchiomotor Parasympathetic motor

What are the three functions of the branchiomotor branch of Facial nerve (CN VII)?

1) Muscles of facial expression 2) Post belly of digastric 3) Stylohyoid

What is the special sensory function of facial nerve (CN VII)?

Taste ant 2/3 of tongue

What is the general sensory function of Facial nerve (CN VII)?

1) Skin of auricle 2) skin of small area behind ear

What is the parasympathetic function of facial nerve (CN VII)?

1) Lacrimal gland 2) submandibular gland 3) Sublingual gland 4) mucous membranes of nasopharynx, hard and soft palate

What foramen does vestibulocochlear exit?

Internal acoustic meatus

What is the special sensory function of vestibulocochlear?

Special sensory: 1) hearing 2) balance

Does vestibulocochlear have any branches?

What nerve innervates nasal cavity with afferent sensory fibers?

Olfactory CN I

What nerve sends afferent sensory fibers to the eye?

Opti CN II

What nerve sens efferent motor branches to the ciliary muscle, sphincter pupillae, and all external eye muscles except two

CN III, Oculomotor

What nerve sens efferent motor fibers to the superior oblique muscle?

Trochlear CN IV

What nerve sends efferent motor fibers to later rectus?

Abducent CN VI

What nerve sends afferent sensory fibers to the face, sinuses, teeth, orbit and oral cavities, dura matter ANd sends efferent motor fibers to muscles of mastication: tensor tympani, tensor veli palatini, mylohyoid, anterior belly of digastric

Trigemina CN V

What nerve

What nerve sends efferent motor fibers to muscles of face, stapedius, posteior belly of digastric, stylohyoid, occipitalis, auricular muscles? Motor- submadibular, subligual, lacrimal glands taste-anterior 2/3 of tonuge, sensory soft palate

Facial CN VII

What nerve sends afferent sensory fibers to cochlea and vestibule?

Vestibulocochlear CN VIII

What are the strap muscles innervated by?

C1, 2, 3 spinal nerve fibers

What nerve does taste of posterior 1/3 of tonuge sensory- tonsil, pharynx, middle ear motor-stylopharyngeus, parotid gland

CN IX, Glossopharyngeal

What nerve sends motor fibers to sternocleidomastoid, and trapezius?

Accessory CN XI

What nerve sends motor innervation to tongue muscles?

Hypoglossal CN XII