NURS 251 Exam 2 with complete solutions
2024/2025
CN 1 - ANSWER- Olfactory
CN2 - ANSWER- Optic
CN3 - ANSWER- Oculomotor
CN4 - ANSWER- Trochlear
CN5 - ANSWER- Trigeminal
CN6 - ANSWER- Abducens
CN7 - ANSWER- Facial
CN8 - ANSWER- Acoustic
CN9 - ANSWER- Glossopharyngeal
CN10 - ANSWER- Vagus
CN11 - ANSWER- Spinal Accessory
CN12 - ANSWER- Hypoglossal
Name the 3 sensory CNs
OOA - ANSWER- -Olfactory
-Optic
,-Acoustic
Name the 5 motor CNs
OTASH - ANSWER- -Oculomotor
-Trochlear
-Abducens
-Spinal Accessory
-Hypoglossal
Name the 4 mixed CNs
TFGV - ANSWER- -Trigeminal
-Facial
-Glossopharyngeal
-Vagus
Which CNs come off of the midbrain? - ANSWER- -olfactory
-oculomotor
-optic
-trochlear
Which CNs come off of the pons - ANSWER- -trigeminal
-abducens
-facial
-acoustic
Which CNs come off of the medulla - ANSWER- -glossopharyngeal
-vagus
-spinal accessory
-hypoglossal
Name the CNs that can be clumped together to check - ANSWER- -3,4,6
(oculomotor, trochlear, abducens)
-5,7 (Trigeminal, facial)
-9,10,12 (glossopharyngeal, vagus, hypoglossal)
How would you test the olfactory CN 1 - ANSWER- Give pt a sample of something
to smell (something common) and ask them what they believe it is.
This nerve smells impulses from nasal mucous membrane and sends the sense
to the brain - ANSWER- olfactory
,this cranial nerve sends visual impulses from eye to brain - ANSWER- optic
What tests can you use to test CN2, optic - ANSWER- -visual acuity (Snellen)
-Visual Fields (check optic discs)
Explain the Snellen test and what does it test for - ANSWER- - the snellen test
checks teh optic nerve
- you must have teh pt stand back 20 ft away and ask them to read the lowest line
they can and see how far they cam read it to.
What does it mean when a pt has a 20/40 vision - ANSWER- he can see at 20ft
what people can see at 40ft
this cranial nerve controls eye muscle contraction, eye movement, constricts
pupils, and elevates eyelids - ANSWER- the oculomotor nerve
How can you test oculomotor, trochlear, and abducens and explain the test
6EEP - ANSWER- -the six cardinal fields of gaze
-Extraocular eye movement (can the eye get there)
-Eye muscle movement (lazy eye)
-Pupillary response
What is a lazy eye and when is it checked - ANSWER- its checked when checking
for CNs 3,4,6
-it occurs when the muscles surrounding the eyes are too strong, you can be
born with it or it can be because of stress on the eyes from reading and such.
Explain when checking CN 3,4,6 what pupillary responses you're checkign for -
ANSWER- -consensual responses
-accomodation
what happens when checkign CN3,4,6, for pupillary accomodation - ANSWER-
close items will constrict the pupils
items at a distance will dilate the pupils
What happens when checking CN 3,4,6 for pupillary consensual reaction -
ANSWER- you shine light in the left pupil to constrict it and then the automatic
response is for the right pupil to constrict as well.
When checking the CN 3,4,6 how are you supposed to describe your pt's results -
ANSWER- PERLA
, What is PERLA - ANSWER- A way to size up the pupils and look at a shape
it stands for
Pupils equal round react to light accomodation.
this cranial nerve controls contracts eye muscle and eye movement - ANSWER-
trochlear
this cranial nerve controls lateral eye movement - ANSWER- abducens
Explain how you would assess the sensory and motor portion of CN 5 and 7 -
ANSWER- Sensory: use a cotton ball to rub pt's face on the three region (sharp
and dull object) also have pt identify sweet, sour, and salty objects
Motor: Have pt clench teetch, smile frow
n, wrinkle forehead, etc
this cranial nerve controls hearing and balance - ANSWER- acoustic
How do you test CN 8, acoustic - ANSWER- whisper in their ear on both sides
have one side blocked
This cranial nerve controls taste, gag, salivary glands - ANSWER-
Glossopharyngeal
This cranial nerve controls sensation from the throat, larynx, heart, lungs,
bronchi, GI Tract, swallowing, talking, digestion. - ANSWER- Vagus
This cranial nerve controls neck muscles, shoulder, head rotation, and larynx -
ANSWER- Spinal accessory
This cranial nerve controls tongue, food movement, and talking. - ANSWER-
hypoglossal
how would you test CN 9,10,12 - ANSWER- -Have pt open mouth and say "Ah"
-Stick tongue out (notice if its midline, tremors, or deviations)
-Have pt say "night, flight, dynamite"
How would you test CN 11, Spinal accessory - ANSWER- -have hands on pt
shoulders and have the pt shrug
-have pt push their head against the palm of your hand.
