The Compendium of Caraka 8.9.3_2

8.9.3_2

tatra śākhāśritebhyo marmabhyaḥ skandhāśritāni garīyāṃsi, śākhānāṃ tadāśritatvāt; skandhāśritebhyo 'api hṛdbastiśirāṃsi, tanmūlatvāccharīrasya//

Among them, those residing in the trunk are more significant than those residing in the limbs, because the limbs depend on it; and even among those residing in the trunk, the heart, urinary bladder, and head are [paramount], because the body is rooted in them.