Majja Dhatu (मज्जा धातु)

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Majja Dhatu is one of the 7 dhatus described in Ayurveda. It is 6th in order of dhatu sequence. The word majja literally means marrow. Thus majja dhatu in Ayurveda is equivalent to the soft bone marrow tissue described in western medicine. Also, majja (marrow) of animals is described in Ayurveda at many places especially where oleation (Snehana) therapy is described. There it refers to the marrow tissue of animals which possesses unctuous and nourishing properties. When the word majja is used in the context of pharmacology and herbs in Ayurveda it refers to the 'fleshy part of the fruit or seed'.

Etymol0gy and definition

The word 'Majja' is derived from root word 'Majjan' which means to be immersed, drowned or submerged into something. Therefore in human body, the dhatu which is present inside the other i.e. Asthi dhatu is called as the 'Majja dhatu'. This has been explained in depth while describing the formation of dhatus in Charaka samhita. Majja dhatu is thus defined as, the body component which fills the cavities of bones.

Panchabhoutikatwam

Sneha (Unctuousness) is the most important quality of majja dhatu described by Ayurveda acharyas. Sneha means the ability to bind something together. This is the characteristic feature of Jala mahabhuta. Hence the mahabhuta having sneha dominant quality i.e. jalam is in abundance in majja dhatu.

Location of majja dhatu

Majja dhatu is invariably present inside the cavities of bones as the name suggests. Majjavaha srotas i.e. the channels of transportation and transformation of majja dhatu are known to originate from bones and joints. Also, since eyes are placed inside the cavities formed by bones of skull, those too are believed to be dominant in majja dhatu. The increase in level of majja dhatu is reflected in eyes where heaviness is experienced. Thus, majja dhatu is found in bones, joints and eyes.

Formation or utpatti

The majja dhatu is formed from its predecessor asthi dhatu and meda dhatu ( धातु). During metabolism, vata dosha produces hollowness inside the asthi dhatu. These hollow cavities are filled by the unctuous extract of meda dhatu which percolates inside asthi through its minute holes because of porous nature of Asthi. In this way, the majja dhatu is formed.

Upadhatu of majja dhatu

Majja dhatu when subjected to the process of micro-transformation (सूक्ष्मपचनम्), it generates 1 more body component which is known as Upadhatu (उपधातु Metabolic by-product) of majja dhatu. Sharangadhara samhita (one of the classical treatises on Ayurveda) considers Kesha (hair) as metabolic byproduct of majja dhatu.

Mala of Majja dhatu

During the micro-transformation of majja dhatu inside body and formation of upadhatus (उपधातु), one liquid form of substance is generated as a waste byproduct which is unctuous in nature. This unctuous or fatty substance which provides lubrication specifically in eyes, skin and stools is identified as the mala of majja dhatu.

Majja sara characteristics

Those who have supreme quality of majja dhatu in a body are identified by some characteristic features. These features are called as majja-sarata features (सारता लक्षणानि). Most of these features are manifested on various external body parts. Thus one can identify the quality of majja dhatu by assessing presence or absence of following signs in person.

मृद्वङ्गा बलवन्तः स्निग्धवर्णस्वराः स्थूलदीर्घवृत्तसन्धयश्च मज्जसाराः|

ते दीर्घायुषो बलवन्तः श्रुतवित्तविज्ञानापत्यसम्मानभाजश्च भवन्ति ॥ (Char. Samh. 8.108)

Meaning: The persons having superior quality of majja dhatu are endowed with soft body parts, strength, unctuous complexion, and sweet voice. They have prominent (sthula), long (dirgha) and rounded joints.

Function

Puran i.e. Filling the cavities of bones is the major function of majja dhatu as described by classical Ayurveda treatises. This provides strength to the asthi and ultimately strength to the entire skeletal framework and body structure. Along with that, being unctuous in nature it performs the function of lubrication, maintains unctuousness in body thus keeping check on excess Vata levels. Being predecessor of Shukra dhatu it performs the function of providing nourishment to shukra dhatu.

Causes of vitiation

Majja dhatu is vitiated due to various dietary and lifestyle related causes. Ayurveda acharyas have listed certain causes that directly and adversely affect the channels of transportation and transformation of majja dhatu. These causes therefore vitiate majja dhatu as well. The cases are listed below.

Dietary causes

Viruddha ahara : This is the concept of incompatible food exclusively discussed in Ayurveda. The food that is incompatible for body tissues and thus acts like a foreign body or toxin can be considered as Viruddha. Ayurveda described 18 types of such incompatible food. Any of these types of viruddha ahara when consumed frequently and excessively adversely and directly affect majja dhatu.

Lifestyle related other causes

Other causes that directly and adversely affect majja dhatu are listed below,

• Utpesha crushing injury

• Abhishyanda excessive discharge causing pressure

• Abhighata trauma

• Prapidana compression

Importance in the preservation of health and prevention

• Majja dhatu is specifically important for providing strength to bones and nourishment to reproductive tissues.

• Longevity, strength, learning ability, wealth, understanding, progeny, and social respect depend upon superior quality of majja dhatu. [Cha. Sa.Vimana Sthana 8/108]