Formative Quiz: Brainstem

Which of the following cranial nerves exit from the Pons?

• Glossopharyngeal

• Vestibulocochlear

• Vagus

• Oculomotor

A 65-year-old male presents to the emergency department for dizziness. On physical exam, he has difficulty abducting the left eye and peripheral facial palsy. Head computed tomography scan is concerning for ischemic stroke. What is the site of the lesion?

• Brainstem

• Pons

• Medulla

• Spinal Cord

The tectum consists of 4 swellings, two superior, and two inferior colliculi, that are associated with hearing and vision, respectively.

• True

• False

The nucleus of the tractus solitarius is located in the pons.

• True

• False

The Edinger-Westphal nucleus is located in the medulla oblongata.

• True

• False

The following statements concern the medial medullary syndrome:

• The tongue is paralyzed on the contralateral side

• Ipsilateral hemiplegia is evident

• Ipsilateral sensations of sensation and movement are impaired

• It is commonly caused by a thrombosis of a branch of the vertebral artery to the medulla

The following statements concern the lateral medullary syndrome:

• It may be caused by thrombosis of the anterior inferior cerebellar artery

• The nucleus ambiguus of the same side may be damaged

• Analgesia and thermoanesthesia may be evident on the contralateral side of the face

• Contralateral trunk and extremity hyperalgesia may occur

Identify structure #2.

• Medullary vellum

• Superior cerebellar peduncle

• Basilar groove

• Medial longitudinal fasciculus

Identify structure #1.

• Mecencephalic nucleus of CN V

• Oculomotor nucleus

• Corticospinal and corticonuclear fibers

• Superior colliculus

Identify structure #3.

• Medial lemniscus

• Inferior olivary nucleus

• Reticular formation

• Inferior cerebellar peduncle