Each part of the body is connected to a particular Deva.
They say, ‘Prajanane Brahma tishtatu’, meaning Lord Brahma resides in the genitals (the seat of procreation in the body).
Then, it is said, ‘Padayo Vishnu tishtatu’, meaning Lord Vishnu is present in the feet.
Like that, we say, ‘Hastayo Hara tishtatu’, Hara (a form of Lord Shiva) is present in the hands. ‘Karneyo Ashvino tishtatu’, means that the twin Ashvin Kumars (Vedic gods symbolizing the rising and setting sun, associated with bringing treasures and medicines to man) are present in the two ears. The Ashvin Kumaras are gods responsible for medicinal gifts and the science of Ayurveda. They are said to have propounded the science of Ayurveda. Similarly, our eyes are connected with the Sun god.
The forehead is said to be the seat of Rudra (one of the many forms of Lord Shiva).
Lord Rama is said to be present in the naval region, the seat of Agni (here, referring to the digestive fire).
Rudra and Shiva are two forms of the same god (Shiva), but Rudra is said to be present in the forehead, while Lord Shiva resides in the heart.
So like that, each part of the human body is associated with a particular god.
Note: The above discourse is given by Sri Sri Ravishankar Guruji of Art of Living during his Satsang at Boone, North Carolina, USA on April 7, 2013.