Cranial Nerve Disorders is part of the Nervous System section of Medicine. Practise 27 exam-style MCQs for NEET PG, FMGE, INI-CET and NEET SS, each with the correct answer and a detailed explanation.
Cranial Nerve Disorders MCQs move between facial palsy and its infectious causes, third-nerve ptosis with blurred vision from a posterior communicating artery aneurysm, and abducens palsy with diplopia and facial pain, a NEET PG high-yield tour of cranial nerve localisation.
The most common infectious agents that cause facial palsy are herpes simplex virus type 1 (Bell's palsy) and varicella-zoster virus (Ramsay Hunt syndrome) Reference: Harrison's Principles of Internal Medicine, 21 st ed, Ch: 193, Pg: 1480
A history of headache and no other obvious cause of ptosis is suggestive of cavernous sinus thrombosis. Third nerve palsy is associated with dilated pupil and Horner's syndrome is associated with miosis. A CT can be normal, and diagnosis is confirmed with MRI. Reference: Harrison's Principles of Internal Medicine 21 st ed, Ch: 441, Pg: 3444
This patient is likely to have cord compression from a metastases to the spine. Urgent MRI scan is required to confirm the diagnosis and a referral for either surgery or radiotherapy can then be made. Reference: Harrison's Principles of Internal Medicine, 21 st ed, Ch: 442, Pg: 3447
The pain producing structures in brain includes: scalp, meningeal arteries, dural sinuses, falx cerebri and proximal portion of large pial vessels. The ventricular ependyma, choroid plexus, pial veins, and much of the brain parenchyma are not pain producing Reference: Harrison's Principles of Internal Medicine, 21 st ed, Ch: 16 Pg:112
The interossei muscles and medial two lumbricals are supplied by the ulnar nerve. The lateral two lumbricals (anatomical position), opponens pollicis, abductor pollicis brevis and flexor pollicis brevis are supplied by the median nerve. Reference: Harrison's Principles of Internal Medicine, 21 st ed, Ch: 446, Pg: 3498
A posterior communicating artery aneurysm will cause compression of the third nerve, and therefore pupillary involvement from compression of the parasympathetic fibres that run on the outside of the third nerve. This leads to a dilated pupil. Other features of a third nerve palsy include ptosis, and a 'down and out' eye. Upgaze and adduction is affected. On the contrary, ischemia of the 3rd nerve due to long standing diabetes and atherosclerosis would lead to a palsy which spares the pupillary reflex. Reference: Harrison's Principles of Internal Medicine, 21 st ed, Ch: 441, Pg: 3441
Covering the affected eye causes the false image (outer image) to disappear. In this case, the left eye is involved hence left lateral rectus (abducens nerve). Reference: Harrison's Principles of Internal Medicine, 21 st ed, Ch: 441, Pg: 3441
In the pre-antibiotic era, an abducens nerve palsy with ipsilateral pain and numbness was due to petrous osteitis (Gradenigo syndrome) but is now more likely the result of a meningioma or nasopharyngeal carcinoma of the petrous apex. The cavernous sinus syndrome consists of variable involvement of Oculomotor (III) Trochlear (IV) Abducens (VI) Trigeminal (ophthalmic and maxillary division) (V) and Oculo-sympathetic nerves. The superior orbital fissure syndrome is similar to the cavernous sinus syndrome except for the presence of proptosis. Lesions of the cerebellopontine angle causes compression of cranial nerves V (trigeminal), VII (facial) and VIII (vestibulocochlear). Lesions of the midbrain cause a variety of symptoms, depending on the exact area affected. Reference: Harrison's Principles of Internal Medicine, 21 st ed, Ch: 441 Pg: 3444
Cranial Nerve Disorders MCQs move between facial palsy and its infectious causes, third-nerve ptosis with blurred vision from a posterior communicating artery aneurysm, and abducens palsy with diplopia and facial pain, a NEET PG high-yield tour of cranial nerve localisation.
MedLadder includes 27 curated MCQs for Cranial Nerve Disorders under Medicine (Nervous System), covering NEET PG, FMGE, INI-CET and NEET SS preparation.
