·
Chorda Tympani Nerve passes between the internal jugular vein and internal carotid artery as it
travels anteriorly.
·
The sytlomastoid
foramen is found in the temporal bone between the mastoid process and the styloid.
·
The carotid canal is on the inferior surface of
the petrous part of the temporal bone.
·
The jugular foramen is formed between the temporal
and occipital bones.
·
The optic canal is situated in the sphenoid bone
·
The foramen ovale is
found in the greater wing of the sphenoid
·
The pituitary fossa is
part of the middle cranial fossa. It is formed by the
body of the sphenoid bone. The dura mater forms its
roof. The cavernous sinus is found on either side. It is bounded by the
anterior and posterior clinoid processes.
·
The fifth cranial nerve provides sensation to the face except for a region around the angle of the
mandible which is supplied by C2 and C3 in the form of the great auricular
nerve.
·
Cataract does not impair the pupillary light
reflex.
·
The infundibulum of pitutary
connects to the tuber cinereum of hypothalamus.
·
Incongruous hemianopia occurs in lesion of the optic tract.
Congruous hemianopia occurs if the lesion is in the
optic radiation or the visual cortex.
·
Light adaptation takes about 5 minutes and dark adaptation about 20 minutes in the normal population. It is biphasic. The
dark adaptation time is related to the time required to build up rhodopsin stores. Wearing red
glasses can speed up dark adaptation because red light
stimulate rods only minimally in the light.
·
In MS, ERG & EOG is
normal but VEP is delayed..if both VEP & ERG are
abnormal, it suggests that VEP is delayed secondarily to abnormal ERG.
·
Vogt white limbal girdle: Age related corneal degeneration.
Characterized by bilateral, narrow
cresentic lines composed of chalky white deposits(present in Bowman’s membrane) in the interpalpebral fissure along the nasal& temporal limbus.
Type1: separated from limbus by clear interval
Type2: No clear zone in between
·
Mild blurring of central vision with drusen within Bruch membrane beneath RPE. Diagnosis – Macular degeneration.
·
Vit D deficiency asso with
– Zonular cataract
·
Which does not maintain A-P stability of eyeball – Superior oblique
(AA AIIMS May 09 Q.170 : Answer
given is – Suspensory ligament of eye ball)
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