The Head: Cranial Nerves

Question 1

Cranial nerve I

Answer 1

• Name: Olfactory Nerve
• Function: Sensory
• Placement: Through cribriform plate
• Branches: None
• Dysfunction: Not being able to smell

Question 2

Cranial nerve II

Answer 2

• Name: Optic Nerve
• Function: Sensory
• Placement: Passes through optic canal to optic foramen from brain to eye
• Branches: None
• Dysfunction: Vision

Question 3

Cranial nerve III

Answer 3

• Name: Oculomotor Nerve
• Function: Motor
• Placement: the periorbita and passes through the orbital fissure
• Branches: None
• Dysfunction: Pupillary constriction

Question 4

Cranial nerve IV

Answer 4

• Name: Trochelar Nerve
• Function: Motor
• Placement: Orbital Fissure
• Branches: None
• Dysfunction:

Question 5

Cranial nerve V

Answer 5

• Name: Trigeminal Nerve
• Function: Sensory and one branch with motor
• Placement: Arises from brain
• Branches: Opthalmic branch (orbital fissure), mandibular nerve (from oval foramen, then through mandible foramen out from mental), maxillary n. (rostral alar foramen).
• Dysfunction:

mandibular has four more branches: lingual n. (1) inferior alveolar n. (2) mylohyoid n. (3) buccal n. (4)

Question 6

Cranial nerve VI

Answer 6

• Name: Abducens
• Function: Motor
• Placement: Orbital Fissure
• Branches: None
• Dysfunction: Eye movement

Question 7

Cranial nerve VII

Answer 7

• Name: Facial Nerve
• Function: Mixed
• Placement: Stylomastoid foramen
• Branches: auriculopalpebral n, dorsal bucaln., ventral buccal n.
• Dysfunction: Facial expression

Question 8

Cranial nerve VIII

Answer 8

• Name: Vestibulocochlear Nerve
• Function: Sensory
• Placement: Doesn’t really leave skull, internal acoustic meatus
• Branches: Vestibular n. (vestibular sense: acceleration and gravity), cochlear n. (auditory)
• Dysfunction: Hearing

Question 9

Cranial nerve IX

Answer 9

• Name: Glossopharyngeal Nerve
• Function: Both
• Placement: Tympanoccipital fissure
• Branches: None
• Dysfunction: taste and pharyngeal m.

Question 10

Cranial nerve X

Answer 10

• Name: The Vagus Nerve
• Function: Both
• Placement: jugular foramen through to tympanooccipital fissure
• Branches: None
• Dysfunction: taste and esophagus

Question 11

Cranial nerve XI

Answer 11

• Name: Accessory
• Function: Motor
• Placement: from cervical spinal cord, through foramen magnum, esits at jugular foramen/ tympanooccipital fissure
• Branches: None
• Dysfunction: muscles, clediocephalic, sternocepahlaic, trapezius

Question 12

Cranial nerve XII

Answer 12

• Name: Hypoglossal Nerve
• Function: Motor
• Placement: Hypoglossal canal
• Branches: N one
• Dysfunction: Tongue