This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels of Thorax, Subject name: Anatomy
True about blood supply of scaphoid- 
Select and explain. 
A. Mainly through ulnar artery, B. Major supply from ventral surface, C. Major supply from dorsal surface, D. Proximal supply in antegrade fashion
C: Major supply from dorsal surface
Answer: C: Major supply from dorsal surface 
Explanation: Ans. is 'c' i.e., Major supply from dorsal surfaceo Major blood supply (70-80%) of scaphoid comes through dorsal surface via dorsal branches of radial artery,o These dorsal vessels enter the scaphoid at or just distal to waist area and supply the proximal pole in retrograde fashion.o Proximal 2/3 rd to 3/4 scaphoid is supplied by these dorsal vesselso 20-30% of blood supply comes through palmar and superficial palmar branches of radial artery,o Distal 1/3 rd or 1/4 th and distal tubercle are supplied by these palmar vessels.