Intermediate Medulla Oblongata Quiz

Q1. Where does the pyramidal decussation occur?

• Caudal medulla
• Thalamus
• Rostral pons
• Midbrain tectum

Q2. What happens to fibers arising from the gracile and cuneate nuclei?

• They enter the optic tract
• They leave through the hypoglossal nerve
• They cross as internal arcuate fibers and form the medial lemniscus
• They form the corticospinal tract

Q3. Which nucleus is responsible for branchial motor output carried mainly by cranial nerves IX and X?

• Inferior olivary nucleus
• Solitary nucleus
• Gracile nucleus
• Nucleus ambiguus

Q4. Which medullary nucleus receives visceral sensory information, including taste and cardiopulmonary afferents?

• Abducens nucleus
• Solitary nucleus
• Red nucleus
• Hypoglossal nucleus

Q5. Which nucleus provides parasympathetic preganglionic fibers through the vagus nerve?

• Dorsal motor nucleus of the vagus
• Nucleus gracilis
• Inferior salivatory nucleus only
• Trochlear nucleus

Q6. Which medullary nucleus contains somatic motor neurons for the tongue?

• Cuneate nucleus
• Vestibular nucleus
• Solitary nucleus
• Hypoglossal nucleus

Q7. What is the principal role of the inferior olivary nucleus?

• It provides major climbing fiber input to the cerebellum
• It directly innervates tongue muscles
• It carries visual information to the cortex
• It produces cerebrospinal fluid

Q8. Which structure forms part of the floor of the fourth ventricle in the rostral medulla?

• Septum pellucidum
• Optic chiasm
• Rhomboid fossa
• Corpus callosum

Q9. What distinguishes the closed medulla from the open medulla?

• The closed medulla contains no cranial nerve nuclei
• The closed medulla lies superior to the pons
• The open medulla lacks ascending tracts
• The closed medulla surrounds the central canal, while the open medulla borders the fourth ventricle

Q10. Which major sensory tract carries pain and temperature information through the medulla toward the thalamus?

• Corticospinal tract
• Spinothalamic tract
• Fornix
• Optic radiation