By Roger P. Smith, Paul J. Turek
Netter assortment Reproductive process
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Extra resources for The Netter Collection of Medical Illustrations, Vol. 1 Reproductive System
This reﬂected layer blends with Buck fascia surrounding the crura. Thus, in the urogenital triangle, four fascial layers cover the bulbous spongiosum and urethra. First is the Corpus spongiosum (bulb) (tunica albuginea) Bulbospongiosus muscle perineal layer of Colles fascia external to the bulbospongiosus muscle. Beneath this is the deep extension of Colles fascia below the bulbospongiosus muscle, followed by Buck fascia and, ﬁnally, the tunica albuginea. Only three fascial layers cover each crus of the penis: Colles superﬁcial fascia overlying the ischiocavernosus muscles and Buck fascia beneath this muscle, which blends with the deep reﬂected layer of Colles fascia over the tunica albuginea.
Adolescence and secondary sexual characteristics may be expected to mirror the degree of differentiation of gonadal structures. Usually, there is some degree of masculinization. However, coincidental signs of active estrogen secretion may include breast enlargement and menstruation. There is no absolute reason why the gonads may not develop to full spermatogenesis and oogenesis. However, spermatogenesis is unlikely if estrogens are secreted in signiﬁcant quantities because of inhibition of follicle-stimulating hormone.
Ultimately, they empty into the internal iliac veins. THE NETTER COLLECTION OF MEDICAL ILLUSTRATIONS Plate 2-8 The Penis and Male Perineum Anterior view Inferior vena cava Abdominal aorta Inferior mesenteric artery BLOOD SUPPLY OF Renal vessels TESTIS The internal spermatic artery originates from the abdominal aorta just below the renal artery. Embryologically, the testicles lie opposite the second lumbar vertebra and keep the blood supply that is acquired during the ﬁrst weeks of life as they descend into the scrotum.