8.1 Cranial Nerves III, V and VII Flashcards Preview

Semester 4- Head and Neck > 8.1 Cranial Nerves III, V and VII > Flashcards

Flashcards in 8.1 Cranial Nerves III, V and VII Deck (38):
1

Where does the oculomotor nerve originate from?

Anterior midbrain

2

Which two arteries does the oculomotor nerve pass through as it leaves the brain?

Inferior to cerebral artery
Superior to superior cerebellar artery

3

Which layer does the oculomotor nerve pierce to enter the cavernous sinus?

Dura mata

4

Via which fossa does the oculomotor nerve exit the cranial fossa?

Superior orbital fissure

5

Name the 2 structures that the superior branch of the oculomotor nerve innervates

Superior rectus muscle
Levator palpabrae superioris muscle
Sympathetic- superior tarsal muscle

6

Name the 2 structures that the inferior branch of the oculomotor nerve innervates

Inferior rectus
Medial rectus
Inferior oblique
Parasympathetic- sphincter pupillae + ciliary muscles

7

Where does the trigeminal nerve originate from?

3 sensory nuclei and 1 motor nucleus from the midbrain to the medulla

8

Where does the sensory root of the trigeminal nerve form?

At the level of the Pons

9

When does the sensory root become the trigeminal ganglion?

Middle cranial fossa, lateral to the cavernous sinus

10

To which branch of the trigeminal nerve is the motor root distributed to?

V3- mandibular nerve

11

Name the 3 branches of the trigeminal nerve

V1- opthalmic
V2- maxillary
V3- mandibular

12

Where does the ophthalmic nerve exit the cranial cavity?

Superior orbital fissure

13

Where does the maxillary nerve exit the cranial cavity?

Foramen rotundum

14

Where does the mandibular nerve exit the cranial cavity?

Foramen ovale --> Infra-temporal fossa

15

What are the 3 branches of the ophthalmic nerve?

Frontal
Lacrimal
Nasocilary

16

Which area of the face does V1 innervate?

Skin and mucous membranes of scalp, forehead, dorsum of nose, cornea, upper eyelid, conjunctiva, frontal and ethmoidal sinuses

17

Which area of the face does V2 innervate?

Skin and mucous membranes of fronto-nasal prominence derivatives
Lower eyelid, conjunctiva, cheeks, maxillary sinus, nasal cavity, upper lip, superior palate, upper molars, incisors and canines

18

Which area of the face does V3 give sensory innervation to?

Skin, mucous membranes and striated muscle derivatives of the mandibular prominence:
Floor of oral cavity, external ear, lower lip, chin, anterior 2/3rds tongue, lower molar, incisor and canines

19

Which area of the face does V3 give motor innervation to?

Muscles of mastication, anterior belly of digastric, mylohyoid, tensor veli palatini, tensor tympani

20

Which structures do the parasympathetic fibres which run with the trigeminal nerve innervate?

Submandibular and sublingual glands
Parotid gland
Lacrimal gland
Mucous glands in nasal cavity

21

Where does the facial nerve originate from?

Large motor root in the Pons and a small sensory root

22

Which fossa do the roots of the facial nerve travel through as they leave the Pons?

Internal acoustic meatus in the temporal bone

23

Where do the roots fuse?

Facial canal

24

What is the name of the ganglion that the facial nerve forms?

Geniculate ganglion

25

Name the 3 nerves which the facial nerve gives off after the geniculate ganglion

Greater Petrosal Nerve
Nerve to stapedius
Chorda tympani

26

What does the facial nerve go through to exit the facial canal?

Stylomastoid foramen

27

Which nerves branch from the facial nerve when it is extracranial?

Posterior auricular
Nerve to digastric
Nerve to stylohyoid

28

Where does the motor root of the facial nerve split into branches?

Parotid gland

29

Name the 5 motor branches of the facial nerve

Temporal
Zygomatic
Buccal
Marginal Mandibular
Cervical

30

What do the motor nerve branches of the facial nerve innervate?

Muscles of facial expression- derivatibes of the 2nd pharyngeal arch

31

What special sensory innervation is the chorda tympani responsible for?

Taste sensation in anterior 2/3rds of tongue

32

What is the corneal reflex?

Involuntary blinking of the eyelids stimulated by tactile, thermal or painful stimulation of the cornea.

33

What is the afferent limb of the corneal reflex?

Opthalmic nerve (V1)

34

What is the efferent limb of the corneal reflex?

Facial nerve

35

Describe how a oculomotor nerve lesion will present

Ptosis
Down and out eyeball
Dilated pupil

36

Describe how a trigeminal nerve lesion will present

Cannot look laterally

37

Describe how an intercranial facial nerve lesion will present

Facial muscles of expression paralysed
Reduced salivation and loss of taste sensation
Hypersensitive to sound
Reduced lacrimal fluid production

38

Describe how an extracranial facial nerve lesion will present

Paralysis or weakening of the muscles of facial expression ONLY