The Human physical body is composed of “Saptadhatus”.
“Saptadhatus” is a Sanskrit word, which means seven constituent elements [Sapta=seven, dhatus=elements].
They are of great importance in Ayurveda. Ayurveda gives specific treatment methods for diseases related to different dhatus. The seven dhatus are as follows:

Rasa:
Chyle.
Rakta:
Blood.
Mamsa:
Muscle.
Majja:
Marrow.
Asthi:
Bone.
Meda:
Brain and spinal cord.
Sukra:
Sperm and ovum.
Ojas:
“Mahadhatu” =Superior dhatu.