The lower opening of the Sushumna nadi is called ‘Brahmadwara' or the door to Brahman. The kundalini energy has to pass through this opening in its ascent upward. The kundalini resides just below this opening and blocking this opening.
The word means, ‘The cave of Brahman'. This refers to the hollow space between the two hemispheres of the brain and is situated at the top of the brain. In medical science this place is known as the anterior fontanel. This hollow space is also known as ‘Bhramara Gufa' (cave of the bumble bee) and ‘Andha Kupa' (the blind well or the tenth gate). Externally this is the ‘soft spot' that is open when the child is born. In a new born pulsation can be felt at this spot in the first few weeks, after six months it hardens. Thereafter, it is opened only through the practices of Yoga. At the time of death if the soul leaves the body from this point then it is liberated and do not come back for a rebirth