session 3

Question 1

What are the 12 cranial nerves in order?

Answer 1

1. olfactory 2. optic 3. occulomotor 4. trochlear 5. trigeminal 6. abducens 7. facial 8. vestibulocochlear 9. glossopharyngeal 10. vagus 11. spinal accessory 12. hypoglossal

Question 2

which cranial nerves are parasympathetic?

Answer 2

10, 9, 7, 3 - 1973

Question 3

What is cranial nerve 1? what is it’s function? where does it leave the skull?

Answer 3

-olfactory - sensory -it provides special sense of smell, enters the uncus and has a close relation to memory -leaves through the cribiriform plate

Question 4

What is cranial nerve 2? what is it’s function? where does it leave the skull?

Answer 4

-optic nerve - sensory -vision -leaves through the optic canal

Question 5

What is cranial nerve 3? what is it’s function? where does it leave the skull?

Answer 5

-occulomotor - motor -supplies medial, inferior and superior rectus as well as inferior oblique -it has parasympathetic fibres that control pupillary reflex - leaves through the superior orbital fissure

Question 6

What is cranial nerve 4? what is it’s function? where does it leave the skull?

Answer 6

-trochlear -supplies superior oblique muscle of the eye - known as the tramp nerve as it does down and out eye movement -leaves through superior orbital fissure

Question 7

What is cranial nerve 5? what is it’s function? where does it leave the skull?

Answer 7

-trigeminal - has three branches a. opthalamic b. maxillary c. mandibular - sensory and motor -supplies general sensation to to the face a. forehead to tip of nose b. underside of nose to top of lip c. bottom lip to chin and general sensation to anterior 2/3 tongue -supplies motor innervation to the muscles of mastication -leaves through a. superior orbital fissure b. foramen rotundum c. foramen ovale

Question 8

What is cranial nerve 6? what is it’s function? where does it leave the skull?

Answer 8

-Abducens - motor -supplies motor innervation to the lateral rectus abducts the eye -leaves through the superior orbital fissure

Question 9

What is cranial nerve 7? what is it’s function? where does it leave the skull?

Answer 9

• facial nerve has 5 branches T, Z, B, M, C - motor and sensory and parasympathetic
• supplies muscles of facial expression -supplies the stapedius muscle

PS -supplies lacrimal, submandibular and sublingual glands

• supplies gustation to the anterior 2/3 of the tongue
• leaves through the internal acoustic meatus

Question 10

What is cranial nerve 8? what is it’s function? where does it leave the skull?

Answer 10

-vestibulocochlear nerve - sensory -senses hearing, acceleration and position of the head -leaves through the internal acoustic meatus

Question 11

What is cranial nerve 9? what is it’s function? where does it leave the skull?

Answer 11

• glossopharyngeal - motor, sensory and parasympathetic
• somatic motor - stylopharyngeus
• visceral motor - parotid gland
• somatic sensory - skin of external ear
• visceral sensory - posterior 1/3 of tongue, pharynx, and Eustachian tube, carotid body and sinus -afferent gag reflex fibres
• special sense gustation of the posterior 1/3 tongue
• leaves through the jugular foramen

Question 12

What is cranial nerve 10? what is it’s function? where does it leave the skull?

Answer 12

• vagus - sensory, motor and parasympathetic
• somatic motor - muscles of the pharynx and larynx (swallowing and speech)
• visceral motor - viscera of the thoracic and abdominal cavities
• somatic sensory - external ear
• visceral sensory - viscera of the thoracic and abdominal cavities -special sensory - taste buds in the pharynx
• leaves through the jugular foramen

Question 13

What is cranial nerve 11? what is it’s function? where does it leave the skull?

Answer 13

-Accessory nerve - motor -supplies motor innervation to sternocleidomastoid and trapezius -sends fibres through the foramen magnum which then leaves through the jugular foramen

Question 14

What is cranial nerve 12? what is it’s function? where does it leave the skull?

Answer 14

-Hypoglossal nerve - motor -supplies intrinsic and extrinsic muscles of the tongue -leaves through the hypoglossoal canal

Question 15

What cranial nerve’s arise from the cerebrum?

Answer 15

olfactory and optic

Question 16

Which cranial nerves arise from the mid-brain?

Answer 16

trochlear

Question 17

Where does the occulomotor nerve arise from?

Answer 17

mid-brain pontine junction

Question 18

What cranial nerves arise from the pons?

Answer 18

Trigeminal

Question 19

What arrises from the pontine medullary junction?

Answer 19

Abducens, Facial and Vestibulochochlear

Question 20

what cranial nerves arise from the medulla?

Answer 20

glossopharyngeal, vagus, hypoglossol and accessory

Question 21

The superior and inferior colliculus make up the what of the midbrain?

Answer 21

tectum

Question 22

What is the inferior colliculi involved in?
What are it’s connections?

Answer 22

involved in auditory stimuli reflexes - turning towards a sound
recievs inputs from the cochlear nuclei
sends fibres to the medial genticulate body via the inferior brachium