Amr bin Shu'ayb narrates from his father, and he from his grandfather (Sayyiduna Abdullah bin Amr, may Allah be pleased with them both), that the Prophet (peace and blessings be upon him) ruled: "For a deep head wound, one third of the blood money for a life, 33 and one third camels, or its value in gold, silver, cows or goats; and for an abdominal wound it is the same."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16207