Muller&;s muscle is found in
Mullers muscle or involuntary pa of levator palpebrae superioris is supplied by sympathetic fibres from the superior cervical ganglion. Paralysis of mullers muscle leads to paial ptosis. This is a pa of horners syndrome. Ref BDC volume 3,Sixth edition pg 74
Pharynx
Middle ear
Eye lid
Tongue
Head and neck