I am a Myofascial Trigger Point Therapist and have posted many times on the first and second BrainTalk about how trigger points (Knots) in the muscles can be part of may pain and dysfuction syndroms.

Part of my training (based on Janet Travell's life long work) is to look at the whole body not just the area of pain.

We are connected head to toe just like the old song- The head bone is connected to the neck bone ect.
I am trained to look at the soft tissues - muscle and fascia (Tom Myers - Anatomy Trains) in the same way.

We also look at any perpetuating factors for ongoing symptoms like diet, work position, type of bed you seep on ect.

One thing that stands out as the leading perpetuating factor of chronic muscle muscle pain and dysfunction is Morton Foot structure.

I have no connection to the following web site but suggest you review for your own benefit: http://www.mortonsfoot.com/mortonsfoot.html

TN has more than one cause but the muscles can be a large part of it. These muscles of the head and neck can be treated via hands on techniques.
Some of the TN symtoms may be the result of Myofascial Trigger Points in the muscles of the neck especially the Sternocleidomastoid and Temporalis muscles and Zygomaticotemporal (branch of trigeminal nerve) can be entrapped ny the temporalis muscle.
Read the below link and review. Some of these can be self treated. There are many ways to treat trigger points in the muscles. The most important treatment is a home stretch program.

Head and Neck Pain
http://www.round-earth.com/HeadPainIntro.html

Especially read about the Sternocleidomastoid muscle which can cause atypical TN at:

http://www.round-earth.com/SCM.html

also Nerve and Vessel Entrapments by Muscles: Zygomaticotemporal (branch of trigeminal nerve) can be entrapped ny the temporalis muscle.
http://www.round-earth.com/Entrapment.html