Nerves Flashcards
Cranial nerve related to apex of petrous temporal bone A. VIII B. VII C. VI D. V E. IX
Answer- C. & D. VI &V cranial nerve are related to petrous temporal bone.
Which of the following cranial nerves are present in posterior cranial fossa? A. 3rd to 12th B. 4th to 12th C. 5th to 12th D. 6th to 12th
Answer- A. 3rd to 12th cranial nerve pass through posterior cranial fossa.
Only 1st & 2nd cranial nerve do not arise from brain stem and so do not pass through posterior cranial fossa.
Most common cranial nerve involved in intracranial aneurysm is A. IV B. VII C. VIII D. III
Answer- D. Occulomotor nerve
Intracranial aneurysm commonly present with occulomotor (III) or abducent (VI) palsy
Cranial nerve with longest intracranial course is A. Abducens nerve B. Trochlear nerve C. Optic nerve D. Trigeminal nerve
Answer - B. Trochlear nerve
IV nerve is the only cranial nerve to emerge dorsally from the brain stem and has the longest intracranial course.
It is also the most slender cranial nerve.
Site of lesion affecting V, VI & VII cranial nerve A. Midbrain B. Pons C. Medulla D. C-P angle
Answer- B & D. i.e Pons and C-P angle
III, IV - midbrain
V - pons
VI, VII, VIII - junction between pons and medulla
IX, X, XI, XII - medulla
Superior rectus is supplied by which cranial nerve A. Superior division of 3rd nerve B. Inferior division of 3rd nerve C. Abducent nerve D. Trochlear nerve
Answer- A. Superior division of 3rd nerve
Superior rectors and LPS is supplied by superior division of occulomotor nerve.
For Trochlear nerve all are true except A. Longest intracranial course B. Arises from dorsum of brainstem C. Supply ipsilateral superior oblique D. Enter orbit through superior orbital fissure outside Annulus of Zinn
Answer- C. Supply ipsilateral superior oblique
Because trochlear nerve is a crossed cranial nerve (with decussation in midbrain), the trochlear nerve nucleus supplies contralateral superior oblique muscle.
Facts about trochlear nerve-
- It is the thinnest cranial nerve
- It is the only nerve to emerge from dorsum of brainstem
- It has the longest intracranial course
- It enters orbit through outer part of superior orbital fissure i.e lateral to annulus of Zinn
Middle superior alveolar nerve is a branch of A. Mandibular nerve B. Maxillary nerve C. Lingual nerve D. Facial nerve
Answer- B. Maxillary nerve
Superior alveolar nerves (anterior, middle, posterior) are branches of maxillary nerve. Infraorbital nerve is anterior continuation of maxillary nerve and gives origin to anterior and middle superior alvelolar nerve
