CRANIAL NERVE LOCATIONS/LEISONS🧠2️⃣

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define CN V/5 (motor trigeminal)’s location

Location: Motor nucleus in dorsolateral tegmentum at mid-pons level

define CN VII/7 (Facial Nucleus)’s location

Location: caudal pons

define CN IX/9, X/10, XI/11 (Nucleus Ambiguus)’s location

Location: Nucleus ambiguus in ventrolateral reticular formation of the medulla

define CN XII/12 (Hypoglossal)’s location

Location: motor nucleus in the floor of the medullary part of the fourth ventricle

define CN V/5 (motor trigeminal)’s leison symptoms

Lesion symptoms (V3/mandibular branch):

1. Paralysis of ipsilateral jaw-closing muscles

2. impaired ipsilateral Eustachian tube opening

3. altered ipsilateral sound perception

define CN VII/7 (Facial Nucleus)’s leison symptoms

Lesion symptoms (CN VII/7/facial nerve):

1. Facial muscle weakness or paralysis (Bell’s palsy)

2. Hyperacusis due to stapedius muscle paralysis

3. Symptoms may improve over 1–2 months, depending on cause

define CN IX/9, X/10, XI/11 (Nucleus Ambiguus)’s leison symptoms

Lesion symptoms (CN IX/9, X/10, XI/11):

1. Rostral lesion: dysphagia from ipsilateral pharyngeal muscle paralysis

2. Caudal lesion: paralysis of ipsilateral soft palate and larynx

3. Bilateral lesions: more severe effects, may require tracheostomy

define CN XII/12 (Hypoglossal)’s leison symptoms

Lesion symptoms (CN XII/12/hypoglossal nerve):

1. Ipsilateral paralysis and atrophy of tongue muscles

2. Tongue deviates toward the side of the lesion upon protrusion

what are LEISON SYMPTOMS

when a nerve or nucleus becomes damaged, and it affects function

what do we mean when we are discussing a cranial nerve’s location?

Location is where a nerve’s nucleus sits

What is a nerve’s nucleus?

where a nerve’s cell bodies, the neurons’ cores, are located

what CN is the picture showing?

FACIAL NUCLEUS (CN VII/7)

what CN is the picture showing?

HYPOGLOSSAL (CN XII/12)

what CN is the picture showing?

NUCLEUS AMBIGUUS - CNs IX, X, AND XI

what CN is the picture showing?

TRIGEMINAL (CN V/5)