Visceral Reflexes

Question 1

What is the segmental innervation for the Pupillary Light Reflex?

Answer 1

Afferent: CN II
Efferent: CN III

Question 2

What reflex is tested by shining a light into one eye, watching for constriction of both eyes, and then repeating on the other eye?

Answer 2

Pupillary Light Reflex

Question 3

T/F: If you do not see bilateral constriction when assessing the Pupillary Light Reflex, this would indicate a lesion of CN II but NOT CN III.

Answer 3

False; may be either CN II or III

Question 4

What visceral reflex is tested by having the patient look at your finger 2 feet away from them, then follow it in to about 6 inches away from their nose, and then look away at a far object?

Answer 4

Accommodation Reflex

Question 5

What is the normal response when testing for the Accommodation Reflex?

Answer 5

convergence of the eyes,
constriction of the pupils,
and lens thickening

Question 6

Where is the lesion if the patient cannot perform Accommodation?

Answer 6

CN III

Question 7

What Visceral reflex is tested by applying a painful stimulus to the skin of the neck (i.e. pinching)?

Answer 7

Ciliospinal Reflex

Question 8

What is the segmental innervation for the Ciliospinal Reflex?

Answer 8

Afferent: cervicals and CN V
Efferent: Cervical Sympathetics

Question 9

What is the normal response when testing the Ciliospinal reflex? Where is a lesion indicated if this response is absent?

Answer 9

Dilation of the pupil on the painful side of stimulation;

lesion of the cervical sympathetics

Question 10

What Reflex is tested by applying thumb pressure on the eyeballs?

Answer 10

Oculocardiac Reflex

Question 11

What is the segmental innervation for the Occulocardiac Reflex?

Answer 11

Afferent: CN V
Efferent: CN X

Question 12

What is the normal response for the Occulocardiac Reflex?

Answer 12

decrease in heart rate and a fall in the blood pressure

Question 13

What reflex is tested by applying pressure on the carotid sinus either unilaterally or bilaterally? What is the normal response?

Answer 13

Carotid Sinus Reflex;

decrease in heart rate and blood pressure

Question 14

What is the segmental innervation for the Carotid Sinus Reflex?

Answer 14

Afferent: CN IX
Efferent: CN X

Question 15

Which Reflex is tested by wither stroking, pricking, or pinching the dorsum of the glans of the penis? “Milking the Cow”

Answer 15

Bulbocavernosus Reflex

Question 16

What is the normal response for the Bulbocavernosus Reflex?

Answer 16

contraction of the bulbocavernosus muscle and urethral constriction; and contraction of the external anal sphincter

Question 17

What is the segmental innervation for the Bulbocavernosus Reflex?

Answer 17

S3-S4