Majja Dhatu — The Marrow and Nerve Tissue
Majja (marrow/nervous tissue) is the sixth body tissue, filling the hollow spaces of bones and comprising the nervous system's physical substrate.
Majja Dhatu encompasses bone marrow and nervous tissue — the soft, unctuous material that fills the long bones and the spinal cord and brain. This dual assignment (marrow + neural tissue) reflects the Ayurvedic observation that both share qualities of softness, unctuousness, and being enclosed within protective bony structures. Majja governs sensory experience, coordination, and the subtler functions of consciousness. Its health supports mental clarity, sensory acuity, and emotional stability; its derangement manifests as neurological symptoms, dizziness, deep bone pain, and disorders of perception. The modern discovery that bone marrow is the source of all blood cells and immune cells — making it one of the most metabolically critical tissues in the body — adds a dimension to Majja's importance that Ayurveda's clinical observations anticipated without the benefit of microscopy.
Majja fills the hollow places and nourishes from within; it is the seat of subtlety in the physical body.
The dual classification of Majja as both bone marrow and nervous tissue — seemingly strange — is justified by modern discovery: neural stem cells exist in bone marrow, and bone marrow-derived immune cells are critical to brain health and neurological function.
Charaka Samhita