 as for its resemblance to the arteries it is because it pulsates and grows according to what they say from the heart and the air for breathing passes through it. and since the pulsation of the veins is one of the characteristics of the arteries it is no doubt more appropriate to include this vein with the arteries. therefore it is called a venous artery not an arterial vein.
وأما شبهه بالشرايين فلأنه ينبض وينبت على قولهم من القلب، وينفذ فيه هواء التنفس، ولما كان نبض العروق من خواص الشرايين لا جرم، كان إلحاق هذا العرق بالشرايين أولى. ولذلك سمي شريانا وريديا لا وريدا شريانيا.