Trigeminal Nerve Flashcards

Review the trigeminal nerve's three divisions, sensory territories, motor branches, brainstem nuclei, skull foramina, and clinical anatomy.

Card 1 of 30Question

What is the numerical designation of the trigeminal nerve?

Cranial nerve V (CN V).

In This Section

1. What is the numerical designation of the trigeminal nerve?

Cranial nerve V (CN V).

2. What are the primary functions of the trigeminal nerve?

General sensation from the face and motor innervation of muscles derived from the first pharyngeal arch.

3. What are the three major divisions of the trigeminal nerve?

Ophthalmic (V1), maxillary (V2), and mandibular (V3).

4. Which divisions of the trigeminal nerve are purely sensory?

The ophthalmic (V1) and maxillary (V2) divisions.

5. Which trigeminal division carries both sensory and motor fibers?

The mandibular division (V3).

6. From which part of the brainstem does the trigeminal nerve emerge?

The anterolateral surface of the pons, through separate large sensory and small motor roots.

7. Where is the trigeminal ganglion located?

In Meckel's cave, a dural recess near the apex of the petrous temporal bone.

8. What type of neuronal cell bodies are found in the trigeminal ganglion?

Pseudounipolar primary sensory neurons, except those responsible for certain proprioceptive inputs.

9. Through which opening does the ophthalmic division enter the orbit?

The superior orbital fissure.

10. What are the three main branches of the ophthalmic division?

The frontal, lacrimal, and nasociliary nerves.

11. Which facial regions receive general sensation through the ophthalmic division?

The forehead, upper eyelid, cornea, and dorsum of the nose.

12. Through which foramen does the maxillary division leave the middle cranial fossa?

The foramen rotundum.

13. Which fossa does the maxillary nerve enter after passing through the foramen rotundum?

The pterygopalatine fossa.

14. Which regions receive sensory innervation from the maxillary division?

The lower eyelid, cheek, upper lip, upper teeth, and portions of the nasal cavity and palate.

15. Which branch of the maxillary nerve emerges through the infraorbital foramen?

The infraorbital nerve.

16. Through which foramen does the mandibular division exit the cranial cavity?

The foramen ovale.

17. Which muscles of mastication receive motor innervation from the mandibular nerve?

The masseter, temporalis, medial pterygoid, and lateral pterygoid muscles.

18. Which additional muscles are supplied by the motor component of the mandibular nerve?

The mylohyoid, anterior belly of digastric, tensor tympani, and tensor veli palatini.

19. Which branch of the mandibular nerve provides general sensation to the anterior two-thirds of the tongue?

The lingual nerve.

20. Which branch of the mandibular nerve enters the mandibular foramen to supply the lower teeth?

The inferior alveolar nerve.

21. Which branch of the inferior alveolar nerve emerges through the mental foramen?

The mental nerve, supplying sensation to the chin and lower lip.

22. Which trigeminal nucleus processes fine touch and pressure from the face?

The principal sensory nucleus of the trigeminal nerve in the pons.

23. Which trigeminal nucleus processes facial pain and temperature?

The spinal trigeminal nucleus, extending from the pons through the medulla into the upper cervical spinal cord.

24. Which trigeminal nucleus contains primary sensory neurons involved in jaw proprioception?

The mesencephalic nucleus of the trigeminal nerve.

25. Where is the trigeminal motor nucleus located?

In the mid-pons, medial to the principal sensory trigeminal nucleus.

26. What is the afferent limb of the corneal reflex?

The ophthalmic division of the trigeminal nerve, primarily through the nasociliary nerve.

27. Which cranial nerve provides the efferent limb of the corneal reflex?

The facial nerve (cranial nerve VII), which activates the orbicularis oculi muscle.

28. What happens to the jaw during opening in a unilateral trigeminal motor lesion?

The jaw deviates toward the affected side because of weakness of the ipsilateral pterygoid muscles.

29. What is trigeminal neuralgia?

A disorder characterized by recurrent, brief attacks of severe, electric shock-like pain in one or more trigeminal sensory divisions.

30. What is the most common anatomical mechanism associated with classical trigeminal neuralgia?

Neurovascular compression of the trigeminal nerve near its brainstem root entry zone, often by the superior cerebellar artery.