I'm a bad student myself I can not remember him. I apologize before I am wrong. Please comment on it ...
These are not my own discoveries. There are books in the book. The problem is not memorized, and the book is not intended to read. So Bengali has to read in the form of literature:
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First of all, some common retail knowledge should be known
i) The nucleus of facial nerve is in pons
ii) Provides supply at facial nerve muscles of facial expression
iii) facial nerve nucleus can be divided into two parts for convenience-
a) Upper half: upper face
b) lower half: lower face
iv) Nucleus receives innervation from motor cortex
Now the semantics
Contralateral: The opposite side of the body to the lesion.
ipsilateral: same side of the body to the lesion
Now let's go to another Deep. From here we have to match the picture below. I understand Leo's cousin- see picture ^ _ ^
upper half of nucleus = contralateral and ipsilateral both innervation gets from motor cortex
lower half = innervation gets only from contralateral
(Photo 1 till now)
pathology
UMN lesion is on the left side- (photo2)
Since there is no trouble in the contralateral and ipsilateral aspects of the upper facial part, hence there is no disturbance (there will be no problem in the left side of the left side, and the right side to get the innervation from the left side when the lesion on the right is right)
But there will be a problem in his right side of lower part of face - because the right side of the lower side of face is getting only contralateral
If the right side is the lower motor neuron lesion?
So what will be the 3rd picture?
Simple calculation - its upper part of face and lower part of face will be lost in an innervation
I hope you will correct in writing.