Summary anatomy of the testis

TESTIS INTRODUCTION • The testis is a male gonad. • It is homologous with the ovary in the female. • It is a mobile organ and lies in each half of the scrotal sac. • The functions of the testis include production of spermatozoa and secretion of testosterone (or dihydrotestosterone), a male hormone, responsible for the development and maintenance of the secondary sex characteristics of the mal SIZE • It measures approximately 4 X3 X 2.5 cm (length 4 cm, breadth 2.5 cm, anteroposterior diameter 3 cm) and weight 10–15 g. • The testis is suspended in the scrotum by the spermatic cord. • It lies obliquely, so that its upper pole is tilted slightly forward and laterally, and lower pole backward and medially FEATURES • 1.Two poles—upper and lower. • 2.Two borders—anterior and posterior. • 3.Two surfaces—medial and lateral. • Both the upper and lower poles are convex and smooth. • The upper pole provides attachment to the spermatic cord. • The anterior border is rounded and completely covered by the tunica vaginalis. CONT… • The posterior border is straight and covered only partly by the tunica vaginalis. • It provides attachment to the epididymis. • On the lateral aspect the epididymis is separated from the testis by the extension of the cavity of tunica vaginalis called sinus of the epididymis . • Both the medial and lateral surfaces are smooth and slightly convex