Cranial Nerve V - Trigeminal Nerve [Part 1] | Origin, Structure, Pathway & Function

The video tutorial covers the trigeminal nerve, cranial nerve 5, detailing its sensory and motor components. It explains the division into V1, V2, and V3, with a focus on the mandibular nerve's dual function. The tutorial highlights the muscles of mastication and their innervation by the trigeminal nerve. It describes the motor pathway, contrasting it with sensory pathways, and explains the role of corticobulbar tracts. The video concludes with a preview of cranial nerve 7, the facial nerve.

Which branch of the trigeminal nerve has both sensory and motor functions?

• None of the above

• V3 (mandibular)

• V2 (maxillary)

• V1 (ophthalmic)

What is the primary function of the muscles of mastication?

• Chewing

• Breathing

• Swallowing

• Facial expression

How many neurons are involved in the motor pathway of the trigeminal nerve?

• Four

• Three

• Two

• One

Where does the decussation occur in the motor pathway of the trigeminal nerve?

• Midbrain

• Pons

• Medulla

• Cerebellum

Which nucleus is involved in the synapse of the lower motor neuron in the trigeminal nerve pathway?

• Vestibular nucleus

• Cochlear nucleus

• Masticator nucleus

• Facial nucleus

What is the role of the corticobulbar tracts in relation to the trigeminal nerve?

• Regulate breathing

• Innervate the limbs

• Innervate mastication muscles

• Control facial expressions

Which cranial nerve innervates the facial muscles?

• Cranial nerve 8

• Cranial nerve 9

• Cranial nerve 7

• Cranial nerve 5