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Fig. 6. —Diagrammatic representation of testicular blood supply. If anterior epididymal artery (dotted line) is absent or its flow is impaired (e.g., because of excessive intrascrotal movement of testis, torsion and detorsion, unobserved interruption of arterial blood flow during operations performed on spermatic cord within inguinal canal), then capsular artery will be terminal vessel in upper pole of testis and is not supplied by collaterals. This possibility may make the patient prone to a focal infarct. a = artery.