Cranial nerves

A 65 y/o man develops (a) subtle slurring of speech, combined with a (b) loss of pain and thermal sensation on the right side of the face and left side of the body. A careful examination reveals that he has (c) paralysis of facial muscles on the right side involving upper and lower portions of the face. Masticatory ms appear to function normally and there is no deviation on protrusion.

Explain the signs and symptoms that are indicated by a,b,c.
Where is the lesion, identify the blood vessel.

My answers.
a. nucleus ambiguus
b. spinal trigeminal nucleus and tract
c. facial nucleus
lesion: R medulla
Blood vessel: vetebral artery and posterior inferior cerebellar artery (PICA) right side.