Antahkaran (inner complex of mind, intellect, chit and ego) is not made up of four separate parts, it is one. But it takes the form of whatever is at work at a particular time. During the time the mind is working, the antahkaran takes on the form of the mind. Then when the intellect works, it takes on the form of the intellect and when the chit is functioning, it takes on the form of the chit. The ego is always with the intellect; it is never alone.
Aptasutra ( Spiritual Quotes by Param Pujya Dadashri ) # 408