Próstata

The prostate is divided into right/left on axial sections by a vertical line drawn through the center (indicated by the prostatic urethra), and into anterior/posterior by a horizontal line through the middle of the gland. 

The right and left peripheral zones (PZ) at prostate base, mid gland, and apex are each subdivided into three sections: anterior (a), medial posterior (mp), and lateral posterior (lp). 

The right and left transition zones (TZ) at prostate base, mid gland, and apex are each subdivided into two sections: anterior (a) and posterior (p) 

The anterior fibromuscular stroma (AS) is divided into right/left at the prostate base, mid gland, and apex. The seminal vesicles (SV) are divided into right/left.