Leadbeater[1] and Annie Besant[2] (Adyar School of Theosophy), and later Alice Bailey, the mental body is equivalent to the "Lower Manas" of Blavatsky's original seven principles of man.
His writings, called Western Wisdom Teachings, give a clear description on how the man's inner Spirit perceives, from the world of thought, the lower worlds through the mind: " We ourselves, as Egos, function directly in the subtle substance of the Region of Abstract Thought, which we have specialized within the periphery of our individual aura.
The process of acquiring the mind of a human in this sense involves the psychological death of the "I" (desire) and the work of practical sexual alchemy.
[7]Whether the lunar or solar aspect, the mental body is stated to exist within the 5th dimension and is represented by Netzach.
[9] In Esoteric Christianity, the mental body is represented by the stubborn yet useful donkey that the Savior (Christ) subdues in order to be used as a vehicle to enter into heavenly Jerusalem (the superior worlds).