Blood Pressure in the Internal Spermatic Artery of the Ram

Summary. The pulsatile blood flow in the internal spermatic artery of the ram is changed by the arterial coils in the spermatic cord so that the testis receives a relatively pulseless blood flow at a lower mean pressure. The major pulse-pressure reduction occurs in the proximal one-third of the coiled length of the artery; in the distal two-thirds, the character of the coiling and structure of the artery change. These observations are discussed particularly in relation to the thermo-regulatory function previously suggested for the internal spermatic artery.