I have found the ideas behind the Chakra system to be helpful in understanding what's going on with my body physically, mentally, and spiritually.  This one page of notes I took long ago has served me very well on my healing journey.  There are seven Chakras or 'energy centers' that correspond to different aspects of the body as noted below.  

My notes from the book, Chakra Healing, by Rosalyn L. Bruyere  1990

1.  RED – Physical Body Sense

Chakra Location:  at the perineium.

Prime body part: Pelvis.

All nerve endings connect to here.  Survival needs, pleasure, and pain are all located here.

Psychological growth stage:  4 years old – self separate from others.

 

2. ORANGE – Emotional Body

Chakra Location:  below the belly button.

Prime body part: Intestines.

Where all feelings are processed.

Psychological growth stage:  7 years old – want others to feel as they feel.

 

3. YELLOW – Mental Body

Chakra Location:  above the belly button and below the V in the rib cage.

Prime body part:  Spleen, stomach, kidneys, adrenals.

Where all thoughts, opinions, and judgements originate and are controlled.

Psychological growth stage:  12 years old – digesting data.

 

4. GREEN – Astral Body

Chakra Location:  to the right of the actual heart.

Prime body part:  Thymus, Auto-immunity.

Bridges real world and the spirit/dream world.

Psychological growth stage:18 years old – consider other before selves, make no decision without considering higher ideals and dreams.

 

5. BLUE – Eupheric Body

Chakra Location:  over the throat.

Prime body part:    Thyroid (controls growth and metabolism).

Controls time and speech.

Beginning of god-like abilities.  "Knowing the right time for things".

Psychological growth stage:28-35 years old – idealistic especially in regards to justice and truth, concept of perfection.

 

6. INDIGO/VIOLET – Celestial Body

Chakra Location:  on forehead, between the eyes and slightly above them.

Prime body part: Pinneal Gland (a light sensitive neurotransmitter).

Holds your individual future and is our access to understanding the future.

Realm of light that allows us to "see the Light" from a clairvoyance perspective.  Home of insight, inspiration, intuition, psychic phenomena, visualization. "The Third Eye".

Psychological growth stage:  45-50 years old – wiser self.

 

7. WHITE (Rainbow, all colors) – Catheric Body

Chakra Location: on the crown of the head; ie. on top of head even with the ears.

Prime body part:  N/A.

The record of your whole spiritual life is here.  Oneness with God is here.

Psychological growth stage::  Ageless – higherself, most like god we can be at this time.