Which Rectus muscle is not supplied by occulomotor nerve ?
Ans. is 'a' i.e., Right side TestisTestis is the male gonad. It is suspended in the scrotum by spermatic cord.Left testis is slightly (1 cm) lower than the right one.The average testicular dimensions are 5 cm (length), 25 cm (breath), 3cm (anteroposterior diameter or thickness) and 10.5-14 gms (weight).The epididymis is attached to is posterolateral surface.Vas (ductus) deference arises from lower pole of epididymis.Lateral pa of epididymis is separated from testis by an extension of cavity of tunica vaginalis, called sinus of epididymis.There is small oval body attached to upper pole of testis called appendix of testis, a remnant of paramesonephric duct.Testis is covered by three coats (from outside to inside) :- (i) tunica vaginalis (which has a parietal and a visceral layer); (ii) tunica albuginea; and (iii) tunica vasculosa. Outside these three coats, there are layers of scrotum. StructureTestis consists of 200-300 lobules.Each lobules consists of 2-3 seminiferous tubules (where spermatozoa are formed).Seminiferous tubules join at the apex of lobules to form straight tubules, which anastomose with each other to form rete testis.Which emerge from upper pole and enter the epididymis. Each tubule becomes highly coiled to form a lobe of the head of epididymis.All tubules end in a single duct which is coiled on itself to form the body and tail of the epididymis. It is continuous with ductus deference.Aerial supplyTestes are supplied by testticular aery, a branch of abdominal aoa, arises at L2 veebral level. Venous drainageThe veins emerging from the testis and epididymis form the pampiniform plexus.Anterior pa of the plexus is arranged around the testicular aery, middle pa around ductus deferens and its aery, and posterior pa is isolated.The plexus condenses into 4 veins at the superficial inguinal ring and 2 veins at the deep inguinal ring. Ultimately, one vein is formed which drains into inferior vena cava on the right and into left renal vein on the left side.Lymphatic drainageLymphatics from the testis run back with the testicular aery to para-aoic nodes along side the aoa at the level of origin of testicular aeries (L2 veebra).
Medial rectus
Lateral rectus
Superior rectus
Inferior rectus