Innervations, Arteries, Fibers, OH MY!!

Question 1

Olfactory (CN I) fiber types and location

Answer 1

SSA, through cribiform plate of ethmoid bone

Question 2

Optic (CN II) fiber types and location

Answer 2

SSA, through optic canal

Question 3

Oculomotor (CN III) fiber types and location

Answer 3

GSE, GVE through superior orbital fissure

Question 4

Oculomotor (CN III) actions and innervations

Answer 4

o Constriction of pupil and accommodation of lens

• Medial rectus, superior rectus, levator palpebrae superioris, inferior rectus, inferior oblique

Question 5

Trochlear (CN IV) fiber types and location, innervations

Answer 5

GSE, through superior orbital fissue

• Superior oblique

Question 6

Trigeminal (CN V)

fiber types and location

Answer 6

o Ophthalmic division (V1) – GSA, through superior orbital fissure

o Maxillary division (V2) – GSA, through foramen rotundum

o Mandibular division (V3) – GSA, BE, through foramen ovale

Question 7

Ophthalmic division (V1) fiber types and location

Answer 7

GSA, through superior orbital fissure
•	Lacrimal
•	Nasociliary 
•	Frontal 
      •	  Supraorbital 
      •	  Supratrochlear

Question 8

Maxillary division (V2) fiber types and location, branches

Answer 8

GSA, through foramen rotundum 
•	Zygomatictemporal 
•	Infraorbital
•	Posterior superior alveolar 
•	Greater and lesser palatine

Question 9

Mandibular division (V3) innervation, fiber types and location

Answer 9

GSA, BE, through foramen ovale 
•	Mylohyoid, anterior belly of digastric. tensor veli palatine 
•	Auriculotemporal 
•	Deep temporal 
•	Inferior alveolar

Question 10

Abducens (CN VI) fiber types and location, innervation

Answer 10

GSE, through the superior orbital fissure

• Lateral rectus

Question 11

Facial (CN (VII) fiber types and location

Answer 11

– GSA, SSA, GVE, BE, GVA, through the internal acoustic meatus and exits through the stylomastoid foramen

Question 12

Facial (CN (VII) actions

Answer 12

o Stimulate secretions of lacrimal, submandibular, and sublingual glands

Question 13

Facial (CN (VII) branches

Answer 13

o	Temporal branches 
o	Zygomatic branches 
o	Buccal branches
o	Mandibular branches
o	Cervical branches
o	Chorda tympani

Question 14

Facial (CN VII) innervations

Answer 14

Posterior belly of digastric, stylohyoid, all muscles of facial expression

Question 15

Vestibulocochlear (CN VIII) fiber types and location

Answer 15

SSA, through the internal acoustic meatus

Question 16

Glossopharyngeal (CN IX) fiber types and location

Answer 16

GVA, GSA, SSA, GVE, BE, through jugular foramen

Question 17

Glossopharyngeal (CN IX) actions and innervations

Answer 17

Stimulate secretions from parotid gland

Stylopharyngeus

Question 18

Vagus (CN X) fiber types and location

Answer 18

GSA, GVA, SSA, GVE, BE, through jugular foramen

Question 19

Vagus (CN X) actions and innervations

Answer 19

o Stimulate smooth muscle and glands in pharynx, larynx, thoracic, and abdominal viscera

• Palatoglossus, levator veli palatini, pharyngeal constrictors, palatopharyngeus, salpingopharyngeus

Question 20

Vagus (CN X) branches

Answer 20

o Superior laryngeal – internal and external (cricothyroid) laryngeal nerves
o Inferior laryngeal (recurrent laryngeal) (intrinsic muscles of the larynx)

Question 21

Accessory (CN XI)

Answer 21

BE, GSE, through jugular foramen

Question 22

Hypoglossal (CN XII) fiber types and location, innervations

Answer 22

GSE, through hypoglossal canal

• Genioglossus, hyoglossus, styloglossus

Question 23

Ansa cervicalis (ventral rami C1-C3)

Answer 23

Sternohyoid, omohyoid, sternothyroid

Question 24

External carotid

Answer 24

o	Superior thyroid
•	Superior laryngeal 
o	Ascending pharyngeal 
o	Lingual 
o	Facial 
o	Occipital 
o	Posterior auricular 
o	Maxillary 
o	Superficial temporal
•	Transverse facial

Question 25

Maxillary (branches)

Answer 25

* Middle meningeal * Deep temporal * Inferior alveolar * Greater and lesser palatine * Sphenopalatine * Infraorbital * Buccal * Mental

Question 26

Subclavian artery

Answer 26

``` o Thyrocervical trunk • Inferior thyroid • Inferior laryngeal • Suprascapular • Transverse cervical o Vertebral artery o Internal thoracic ```

Question 27

Internal carotid

Answer 27

``` o Ophthalmic artery o Middle cerebral (MCA) o Anterior cerebral (ACA) o Anterior communicating o Posterior communicating o Anterior ethmoidal o Posterior ethmoidal ```

Question 28

Vertebral-basilar system

Answer 28

``` o Vertebral o Basilar o Posterior inferior cerebellar (PICA) o Anterior inferior cerebellar (AICA) o Superior cerebellar (SCA) o Posterior cerebral (PCA) ```

Question 29

7 bones of orbit

Answer 29

lacrimal, frontal, maxilla, zygomatic, palatine, sphenoid, ethmoid

Question 30

Sphenoethmoid recess

Answer 30

sphenoid sinus

Question 31

Superior meatus

Answer 31

posterior ethmoid sinus

Question 32

Middle meatus

Answer 32

anterior and middle ethmoid sinus frontal sinus | maxillary sinus

Question 33

Inferior meatus

Answer 33

nasolacrimal duct