BMB 1 - Cranial Nerve Nuclei & Tracts; Cranial Nerve Clinical Examination

Question 1

Identify the respective organs in which each of the following cranial nuclei can be found:

III

IV

Answer 1

Midbrain

Midbrain

Question 2

Identify the respective organs in which each of the following cranial nuclei can be found:

V

VI

Answer 2

Pons

Pons

Question 3

Identify the respective organs in which each of the following cranial nuclei can be found:

VII

VIII

Answer 3

Pons

Medulla

Question 4

Identify the respective organs in which each of the following cranial nuclei can be found:

IX

X

XII

Answer 4

Medulla

Medulla

Medulla

Question 5

Which (if any) cranial nerve nuclei are found in the superior colliculus of the midbrain?

Answer 5

(1) Edinger-westphal
(2) Oculomotor

Question 6

Which (if any) cranial nerve nuclei are found in the inferior colliculus of the midbrain?

Answer 6

Trochlear

Question 7

____________ _______ refers to the ability to simultaneously move both eyes to point in the same direction.

Answer 7

Conjugate gaze refers to the ability to simultaneously move both eyes to point in the same direction.

Question 8

Which cranial nerves are connected via the medial longitutinal fasciculus?

Answer 8

III, IV, andVI

Question 9

The _______ _______ consolidates sensory information about taste from VII, IX, and X.

Answer 9

The solitary nucleus consolidates sensory information about taste from VII, IX, and X.

Question 10

The solitary nucleus consolidates sensory information about what sense?

Answer 10

Taste

Question 11

The oculomotor nucleus is found in the _______ colliculus.

The Edinger-Westphal nucleus is found in the _______ colliculus.

The trochlear nucleus is found in the _______ colliculus.

Answer 11

The oculomotor nucleus is found in the superior colliculus.

The Edinger-Westphal nucleus is found in the superior colliculus.

The trochlear nucleus is found in the inferior colliculus.

Question 12

The nuclei associated with cranial nerve V are all at least partially located within which single organ?

Answer 12

The pons

(the mesencephalic nucleus extends up into the midbrain;

the spinal nucleus extends down into the medulla))

Question 13

Name the four cranial nuclei associated with cranial nerve V (from rostral to caudal).

Answer 13

(1) Mesencephalic
(2) Motor
(3) Main sensory
(4) Spinal

Question 14

Which cranial nucleus is responsible for mastication?

Answer 14

Motor nucleus

(CN V)

Question 15

Which cranial nucleus receives information about discriminative sensation and light touch of the face?

Answer 15

Main sensory nucleus

(CN V)

Question 16

Which cranial nucleus receives information about pain and temperature from the ipsilateral face?

Answer 16

Spinal nucleus

(CN V)

Question 17

The spinal nucleus receives information from which cranial nerves?

Answer 17

V, VII, IX, and X

Question 18

Cranial nerves VII, IX, and X bring sensory information to the spinal nucleus regarding what structure(s)?

Answer 18

The ear

Question 19

Identify the function of the following cranial nuclei:

Abducens nuclei

Facial nuclei

Answer 19

Lateral rectus innervation

Facial musculature innervation

Question 20

Which two cranial nuclei are found at the pontomedullary junction?

Answer 20

Cochlear and vestibular

(both CN VIII)

Question 21

If a patient has ipsilateral facial nerve palsy and abducens palsy, there is likely a lesion in what organ?

Answer 21

The pons

likely a small lesion of the facial colliculus (where the abducens nucleus is covered by facial nerve fibers)

Question 22

Name three cranial nerve nuclei found in the medulla oblongata.

Answer 22

Nucleus ambiguus (CN IX and X)

Inferior salivatory nucleus (IX)

Dorsal motor nucleus (CN X)

Question 23

Which cranial nucleus receives input from cranial nerves IX and X and is involved in coordinating deglutition?

Answer 23

Nucleus ambiguus

Question 24

Which cranial nerve nucleus is in charge of parasympathetic innervation of the heart, lungs, and GI tract?

Answer 24

The dorsal motor nucleus (CN X)

Question 25

The superior salivary nucleus (CN \_\_\_) is found in the \_\_\_\_\_.

Answer 25

The superior salivary nucleus (CN **_VII_**) is found in the **_pons_**.

Question 26

The inferior salivary nucleus (CN \_\_\_) is found in the \_\_\_\_\_.

Answer 26

The inferior salivary nucleus (CN **_IX_**) is found in the **_medulla_**.

Question 27

What is the role of the superior salivary nucleus (CN VII)?

Answer 27

Preganglionic parasympathetic innervation for **salivary** and **lacrimal** **glands**

Question 28

What is the role of the inferior salivary nucleus (CN IX)?

Answer 28

Innervation of the **parotid** **salivary** **gland** and preganglionic parasympathetic innervation of **otic** **ganglion**

Question 29

List the general functions of the following nuclei in their connection with CN V: ## Footnote **Principal sensory nucleus** **Spinal nucleus** **Motor nucleus**

Answer 29

**Principal sensory nucleus** - discriminatory sensation of the face **Spinal nucleus** - pain and temperature in the ipsilateral face **Motor nucleus** - mastication

Question 30

List four nuclei associated with CN VII. Mnemonic: ***SSSSF***

Answer 30

**Spinal** nucleus **Solitary** nucleus **Superior** **salivary** nucleus **Facial** nucleus

Question 31

Sensory information of the pinna is routed to the ______ nucleus (CN \_\_\_\_).

Answer 31

Sensory information of the pinna is routed to the **_spinal_** nucleus (CN **_VII_**).

Question 32

The CN IX portion of the nucleus ambiguus controls which muscle(s)? The CN X portion of the nucleus ambiguus controls which muscle(s)?

Answer 32

Stylopharyngeus Pharynx and larynx

Question 33

Which cranial nerves carry information to the spinal nucleus of V regarding crude touch, pain and temperature for the face and ear?

Answer 33

**V** (face), **VII** (pinna), **IX** (ear), and **X** (ear)

Question 34

Which cranial nerve nucleus is associated with posture, balance, and conjugate eye movements?

Answer 34

Vestibular nucleus (CN VIII)

Question 35

CN III carries parasympathetic innervation of which two muscles?

Answer 35

(1) Sphincter pupillae (2) Ciliary body

Question 36

CN XII receives its input from which cranial nucleus in order to control the musculature of the tongue?

Answer 36

The hypoglossal nucleus

Question 37

**Complete** **decussation** only occurs in which cranial nerve(s)?

Answer 37

**CN IV _only_** | (partial in II, VII, and XII)

Question 38

How do you assess CN I function?

Answer 38

Smell test | (one nostril at a time)

Question 39

How do you assess CN II function? | (4)

Answer 39

**1.** Visual field test (finger to 3 test) **2.** Visual acuity test (20/20) **3.** Red desaturation test (for optic neuritis) **4.** Autonomic test (pupillary light reflex)

Question 40

What test can be used for assessing CN III, IV, and VI?

Answer 40

Extraocular motor (EOM) test | (H-test)

Question 41

How do you assess CN V function? | (3)

Answer 41

**1.** Facial sensation test **2.** Mastication symmetry **3.** Jaw jerk reflex

Question 42

How do you assess CN VII function? | (3)

Answer 42

**1.** Closing eyes and mouth tight **2.** Salivation/lacrimation **3.** Anterior tongue taste test

Question 43

What portion of the face is innervated bilaterally by the cortex?

Answer 43

The upper face

Question 44

How do you assess CN VIII function? | (2)

Answer 44

**1.** Hearing tests (Rhinne and Weber) **2.** Cold water in-ear test

Question 45

How do you assess CN IX function? | (2)

Answer 45

**1.** Gag reflex **2.** Posterior tongue taste test

Question 46

How do you assess CN X function? | (2)

Answer 46

**1.** Uvula deviation test **2.** Hoarseness/gag reflex

Question 47

If CN X is lesioned, what is the likely ANS result?

Answer 47

Loss of parasympathetics

Question 48

How do you assess CN XI function?

Answer 48

Deficits in **SCM** and **trapezius**

Question 49

How do you assess CN XII function?

Answer 49

Tongue deviates towards lesioned side