Om Namasivaya Nama:
Praana-Maya Kosa: (Vital Air Sheath):
Prana along with Five organs of action (Karmendriyas) constitute Pranamaya Kosa. Due to the presence of Pranamaya Kosa the body involve in activities.
The Pranamaya Kosa is not Self since it is dependent of Self itself and it is only a modification of Air.
Manomaya Kosa : (Mental Sheath):
It is the five organs of perception (Jgnanedriyas) and mind makes Manomaya Kosa, which is the sole cause for I and Mine and also make names and forms.
The Five Sense Organs act as priest of conducting Yagna/Homa who will feed the fuel of numerous desires in to the Manomaya Kosa which is the sacrificial fire. The flame raise up during the time is what our desire-full world. One should burn it off all desires within this mind itself.
In other words one sheath is superior to other and getting more closer to Self but none of these Self!
Please click below link to down load full discourse: