Тест: Neural Pathways and Cranial Nerve Functions — 11 въпроса

1. Which opening connects the pterygopalatine fossa with the nasal cavity?

A. Sphenopalatine foramen

B. Foramen rotundum

C. Pterygomaxillary fissure

D. Inferior orbital fissure

Answer: (A)

Обяснение

The sphenopalatine foramen is the key passage between the pterygopalatine fossa and the nasal cavity. The inferior orbital fissure connects the fossa to the orbit, not the nose.

2. Which statement best describes the relationship between the facial nerve and the intermedius of Wrisberg?

A. The facial nerve is purely sensory, while the intermedius is purely motor

B. The intermedius carries only parasympathetic fibers to the lacrimal gland

C. They form a common nerve complex, with the intermedius carrying sensory and taste fibers

D. They are separate motor nerves to different branches of the parotid gland

Answer: (C)

Обяснение

CN VII and the intermedius of Wrisberg form a nerve complex, and the intermedius carries sensory fibers including taste. The facial nerve itself is not purely sensory.

3. Which segment of the facial nerve is the longest and exits the facial canal through the stylomastoid foramen?

A. Tympanic segment

B. Mastoid segment

C. Labyrinthine segment

D. Intraparotid segment

Answer: (B)

Обяснение

The mastoid segment is the longest part of the facial canal and leaves through the stylomastoid foramen. The tympanic segment lies around the middle ear, not at the exit.

4. Which nerve leaves the facial canal through the petrotympanic fissure?

A. Chorda tympani

B. Posterior auricular nerve

C. Stapedius nerve

D. Greater petrosal nerve

Answer: (A)

Обяснение

The chorda tympani arises from the facial canal and exits the tympanic cavity through the petrotympanic fissure. The stapedius nerve instead supplies the stapedius muscle.

5. Which set of branches belongs to the extracranial facial nerve and supplies muscles of facial expression?

A. Greater petrosal, stapedius, and chorda tympani

B. Temporal, zygomatic, buccal, mandibular, and cervical branches

C. Auricular, pharyngeal, and meningeal branches

D. Lacrimal, nasal, and palatine branches

Answer: (B)

Обяснение

These are the terminal motor branches of CN VII that innervate the muscles of facial expression. The other options list intrapetrous, parasympathetic, or unrelated cranial nerve branches.

6. Through which pathway does the tympanic nerve of Jacobson reach the tympanic cavity?

A. Stylomastoid foramen

B. Inferior orbital fissure

C. Foramen ovale

D. Tympanic canaliculus

Answer: (D)

Обяснение

Jacobson's nerve passes through the tympanic canaliculus to reach the tympanic cavity. The foramen ovale is associated with the otic ganglion pathway, not this sensory branch.

7. Which structure is the main endpoint of the posterior vagal trunk in the abdomen?

A. Submandibular ganglion

B. Pterygopalatine ganglion

C. Celiac plexus

D. Otic ganglion

Answer: (C)

Обяснение

The posterior vagal trunk runs on the posterior surface of the esophagus and cardia and ends in the celiac plexus. The otic and submandibular ganglia belong to other cranial parasympathetic pathways.

8. Which region is primarily supplied by the cervical branches of the vagus nerve?

A. Structures of the orbit

B. Structures of the lower limb

C. Structures of the neck

D. Structures of the nasal cavity

Answer: (C)

Обяснение

The cervical branches of the vagus are distributed to structures in the neck. Thoracic branches, not cervical ones, are associated with thoracic viscera.

9. Which branch of V1 enters the nasal cavity and provides sensory supply to the nasal mucosa?

A. Nasociliary nerve

B. Infraorbital nerve

C. Frontal nerve

D. Lacrimal nerve

Answer: (A)

Обяснение

The nasociliary nerve gives internal nasal branches that enter the nasal cavity and supply the nasal mucosa. The infraorbital nerve belongs to V2, not V1.

10. Which set of structures lies in the sensory territory of the ophthalmic nerve V1?

A. Lower lip, chin, and lower teeth

B. Globe of the eye, lacrimal gland, conjunctiva, and upper eyelid

C. Parotid gland and posterior tongue

D. Soft palate and uvula

Answer: (B)

Обяснение

V1 supplies the eye, lacrimal gland, conjunctiva, upper eyelid, and nearby frontonasal skin. The other options correspond mainly to V2, V3, or cranial nerve IX/X territories.

11. Which landmark is part of the course of the maxillary nerve V2 before it becomes the infraorbital nerve?

A. It exits the skull through the stylomastoid foramen

B. It crosses the sphenomandibular ligament to reach the tongue

C. It enters the cranial cavity through the optic canal

D. It passes from the pterygopalatine fossa into the inferior orbital fissure

Answer: (D)

Обяснение

V2 travels through the pterygopalatine fossa and then enters the orbit via the inferior orbital fissure, where it continues as the infraorbital nerve. The other routes describe facial, mandibular, or optic pathways.