Cranial Nerve V: Trigeminal nerve

by Craig Canby, PhD

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    The trigeminal nerve, cranial nerve number V is a complex nerve. It has three divisions or nerves associated with it. The anatomic components then of the trigeminal would be the ophthalmic nerve shown here as V/1. The maxillary nerve is the second division or component of your trigeminal nerve, V/2. Then your third and final anatomic component of your trigeminal nerve is the mandibular nerve and that is termed V/3. Functional components of the trigeminal, there are two. One functional component is general somatic afferent. Then because the trigeminal nerve innervates the first pharyngeal arch, it also has branchial efferent functional components. If we look at the trigeminal nerve with respect to general somatic afferent connections or information as being conveyed and do so by each division or nerve, we’ll start with the ophthalmic division, V/1. That area is shown here in yellow. The ophthalmic nerve will convey sensory information from the eyes in conjunctiva. The upper eyelid which is in this shaded area, orbital contents are within the shaded area as well. What we cannot see in this particular image is that sensory information from the frontal sinuses and ethmoidal air cells is being conveyed by this nerve. The dorsum of the nose which we can see right along here, anterior scalp shown in through here and then the dura mater in the anterior cranial fossa as well as a reflection of the dura which would include a portion of the tentorium cerebelli. With respect to the maxillary division, general somatic afferent information being conveyed by V/2 is shown here in this region. This is conveying sensory information from the nasopharynx and nasal cavity, the palate. Maxillary teeth are within this shaded area, the maxillary sinus, skin from the lower eyelid in through here down to the upper...

    About the Lecture

    The lecture Cranial Nerve V: Trigeminal nerve by Craig Canby, PhD is from the course 12 Cranial Nerves and Their Functions.

    Included Quiz Questions

    1. Branchial distribution is via ophthalmic division
    2. It has 3 subdivisions
    3. It innervates muscles of mastication
    4. Branchial efferent is one the functional components
    5. It is a mixed (sensory and motor) cranial nerve
    1. Pain sensation
    2. Protrusion of the tongue
    3. Gustatory sensation
    4. Depression of the tongue
    5. Retraction of the tongue
    1. Posterior belly of digastric muscle
    2. Masseter muscle
    3. Temporalis muscle
    4. Medial pterygoid muscle
    5. Lateral pterygoid muscle
    1. Compression of trigeminal nerve by superior cerebellar artery is a possible cause.
    2. Presents as continuous stabbing facial pain.
    3. Patients cannot precisely localize the pain.
    4. Maxillary and mandibular subdivisions of the trigeminal nerve are rarely involved.
    5. Occurs most commonly in ophthalmic subdivision of trigeminal nerve.

    Author of lecture Cranial Nerve V: Trigeminal nerve

     Craig Canby, PhD

    Craig Canby, PhD

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