Lec 5 Cranial Nerves

Question 1

1

Answer 1

Olfactory

Test: standard scents

Question 2

2

Answer 2

Optic

Test: visual acuity, field, exam retina/optic disc

Question 3

3 - what is it, what are the 2 nuclei

Answer 3

Oculomotor
Oculomotor Nucleus: 5 extraoc musc
Edinger-Wesphal Nucleus: para control of Sphincter Pupillary (pupil constrict/dilate) & Ciliary (lens accom)

Question 4

3 - testing

Answer 4

Observe symptoms of damage: eye droops down/out, 2x vision, loss of lens accom.

Question 5

4

Answer 5

Trochlear (superior oblique).

Test: eye drifts up, may comp by tilting head to contra side to reduce 2x vision.

Question 6

6

Answer 6

Abducens (lateral rectus).

Test: eye drifts inward (cross-eyed)

Question 7

5 - sensory functions & testing

Answer 7

Trigeminal: sensory info from facial.
Test: sensation

Question 8

5 - motor functions & testing

Answer 8

Trigeminal: musc of mastication.
Test: palp jaw.

Question 9

5 - parasympathetic functions & testing

Answer 9

Trigeminal: corneal reflex.
Test: cotton swab or compressed air to cornea = blink (also tests CN 7).

Question 10

7 - sensory functions & testing

Answer 10

Facial: taste from anterior 2/3.
Test: admin common tastes to tip of tongue.

Question 11

7 - motor function & testing

Answer 11

Facial: musc of facial expression.
Test: symmetry of facial musc.

Question 12

7 - parasympathetic functions

Answer 12

salivary & lacrimal

Question 13

Facial Nerve Palsy

Answer 13

unilateral facial paralysis

if sensory portion fucked = loss of taste, salivation, lacrimation.

Question 14

8

Answer 14

Vestibulocochlear
Test cochlear: finger snap, Weber test.
Test vestib: Carloric test.

Question 15

9

Answer 15

Glossopharyngeal: taste to post 1/3, sensation to pharynx/carotid body/sinus.
Para: parotid gland.
Test: tongue depressor (gag reflex).

Question 16

10

Answer 16

Vagus: para & visceral sensation to organs of thorax/abd, motor to palate, pharynx, larynx.
Test: swallowing, talking.

Question 17

11

Answer 17

Accessory (SCM & Traps).

Test: symmetry of neck musc; strength of SCM/traps; observe for winging.

Question 18

12

Answer 18

Hypoglossal: tongue muscles.
Test: observe tongue for atrophy/strength/symmetry. Protrude tongue & push R/L against depressor

Question 19

Damage to 12 = tongue deviates to which side?

Answer 19

ipsilateral