Cranial Nerves Flashcards
What canal does the optic nerve enter?
Optic canal
Does the optic nerve (CNII) have any branches?
No
What is the function of CN II, Optic Nerve?
Retina, vision
What is the fiber type in the optic nerve?
Special sensory
What foramen does the oculomotor nerve (CN III) enter?
Superior orbital fissure
Does the oculomotor CN III have any branches?
Yes, two:
1) Superior branch
2) Inferior Branch
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
What are the parasympathetic functions of the oculomotor nerve?
1) Sphincter pupillae
2) Ciliary muscle
What foramen does the trochlear nerve enter?
superior orbital fissure
Does trochlear nerve (CN IV) have any branches?
Yes, muscular branch
What if the function of trochlear?
General somatic motor:
1) Superior oblique
What foramen do the three branches of trigeminal exit?
V1 (opthlamic): Sup orbital fissure
V2 (maxillary): foramen rotundum
V3 (mandibular): foramen ovale
What are the three branches off trigeminal?
V1: opthalmic
V2: maxillary
V3: mandibular
What are the four branches of of opthalmic (V1)?
(branch off Trigeminal CN V)
1) Meningeal
2) Frontal
3) Lacrimal
4) nasociliary
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
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
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
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
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?
No
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?
no
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
