Charaka

# Overview
Charaka, sometimes spelled Caraka, born c. 300 BC in a Maga Brahmin family was one of the principal contributors to the ancient art and science of Ayurveda,  a system of medicine and lifestyle thought to be developed about 5000 years ago in Ancient India.

# Acharya Charaka & Ayurveda
The term Caraka is a label said to apply to wandering scholars or wandering physicians.  see Charaka Samhita.
According to Charaka's translations health and disease are not predetermined and life may be prolonged by human effort and attention to lifestyle.
The following statements are attributed to Charaka:
These remarks appear obvious today, though they are often not heeded, and were made by Charaka, in his famous Ayurvedic treatise Charaka Samhita. The treatise contains many such remarks which are held in reverence even today. Some of them are in the fields of physiology, etiology and embryology.
Charaka was the first physician to present the concept of digestion, metabolism and immunity. According to his translations of the Vedas, a body functions because it contains three dosha or principles, namely movement (vata), transformation (pitta) and lubrication and stability (kapha). The doshas are also sometimes called humours, namely, bile, phlegm and wind. These dosha are produced when dhatus (blood, flesh and marrow) act upon the food eaten. 
For the same quantity of food eaten, one body, however, produces dosha in an amount different from another body. That is why one body is different from another. For instance, it is more weighty, stronger, more energetic.
Further, illness is caused when the balance among the three dosha in a human body is disturbed. To restore the balance he prescribed medicinal drugs. Although he was aware of germs in the body, he did not give them any importance.
Charaka knew the fundamentals of genetics. For instance, he knew the factors determining the sex of a child. A genetic defect in a child, like lameness or blindness, he said, was not due to any defect in the mother or the father, but in the ovum or sperm of the parents (an accepted fact today).
Charaka studied the anatomy of the human body and various organs. He gave 360 as the total number of bones, including teeth, present in the body. He wrongly believed that the heart had one cavity, but he was right when he considered it to be a controlling centre. He claimed that the heart was connected to the entire body through 13 main channels. Apart from these channels, there were countless other ones of varying sizes which supplied not only nutrients to various tissues but also provided passage to waste products. He also claimed that any obstruction in the main channels led to a disease or deformity in the body.
Under the guidance of the ancient physician Atreya, Agnivesa had written an encyclopedic treatise in the eighth century B.C. However, it was only when Charaka revised this treatise that it gained popularity and came to be known as Charakasamhita. For two millennia it remained a standard work on the subject and was translated into many foreign languages, including Arabic and Latin.

# Contributions
According to the Charaka tradition, there existed six schools of medicine, founded by the disciples of the sage Punarvasu Atreya.  Each of his disciples,  Agnivesha, Bhela, Jatukarna, Parashara, Harita, and Ksharapani, composed a Samhita.  Of these, the one composed by Agnivesha was considered the best. The Agnivesha Samhita was later revised by Charaka and it came to be known as Charaka Samhita. The Charaka Samhita was revised by Dridhbala.
Ayurveda is traditionally divided into eight branches which, in Charaka's scheme, are:
- Sutra-Sthana, general principles
- Nidana-Sthana, pathology
- Vimana-Sthana, diagnostics
- Sharira-Sthana, physiology and anatomy
- Indriya-Sthana, prognosis
- Chikitsa-Sthana, therapeutics
- Kalpa-Sthana, pharmacy
- Siddhi-Sthana, successful treatment

# Charaka Samhita
The Charak Samhita contains 120 adhyayas (chapters), divided into 8 parts.
- Sutra Sthana
- Nidan Sthana
- Viman Sthana
- Sharir Sthana
- Indriya Sthana
- Chikitsa Sthana
- Kalpa Sthana
- Siddhi Sthana
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