Anatomy Notes

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Western University
Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesMar 2712 The urinary and reproductive systems are connected in males The primary sex organs in males are the gonads testes The testes form spermatozoa and secrete sex hormones androgens The secondary sex organs are involved in the transmission of sperm and they include ducts accessory glands and copulatory organ The ducts consist of the epididymis ductus vas deferens ejaculatory duct and urethra The accessory glands consist of the seminal vesicles prostate gland and bulbourethral gland They produce the fluid component of serum The copulatory organ is the penis External genitaliascrotum The scrotum is a fibromuscular sac of pigmented skin and superficial fascia The testes are located in the scrotum It responds to temperature change When it is cold the testesscrotum are pulled closer to the body wall and when it is warm the scrotal skin becomes flaccid and lose Musculature of the scrotum The dartos muscle is smooth muscle located within the superficial fascia It is located just beneath the skin and is responsible for wrinkling the scrotal skin Cremaster muscle is a continuation of the internal oblique muscle It elevates the testes Anatomy of the scrotum The middle septum of the scrotum divides the scrotum into right and left halves providing one compartment for each testis Each compartment of the scrotum is derived from labioscrotal swellings of the embryo These form the labia majora in females and come together to fuse at the midline in males Layers of the scrotum from external to internal skin dartos muscle external spermatic fascia cremasteric muscle internal spermatic fascia tunica vaginalis tunica albuginea Testes The testes are approximately 4cm x 25cm They are surrounded by two tunic layersthe tunica vaginalis and the tunica albuginea The tunica vaginalis is a doublelayered serous sac that developed from the abdominal peritoneal cavity and descended into the scrotum It has a superficial parietal layer a cavity containing serous fluid and a deep visceral layer These are not peritoneal structures The spacecav
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