What division of the autonomic nervous systems plays a role in ejaculation?
During sexual excitement, what does the parasympathetic nervous system do to the arterioles?
The parasympathetic nervous system also increases mucus secretions of what gland?
What is a massive discharge of nerve impulses over the sympathetic nerves serving the genital organs?
During ejaculation, what muscle constricts to prevent expulsion of urine or reflex of semen into the bladder?
During ejaculation, what muscles of the penis undergo a rapid series of contrations, propelling semen foward throught the urethra? (climax or orgasm)
What is the sequence of events in the seminiferous tubules of the testes that leads to the production of male gametes or sperm?
At what approx. age does spermatogenesis begin?
Hormonal regulation of spermatogenesis and testicular hormone production involves interactions between the hypothalamus, ... gland and the testes.
1. gonadotropin-releasing hormone (GnRH)
2. follicle stimulating hormone (FSH), luteinizing hormone (LH)
5. GnRH, FSH, LH
Sequence of events in spermatogenesis
1. Hypothalamus releases what hormone?
2. Binding the previous hormone to pituitary cells prompts the
secretion of what two hormones?
3. What hormone stimulates spermatogenisis in the testes?
Does so by making the spermatogenic cells receptive to
4. What hormone binds to interstitial cells and stimulates
5. Blood testosterone inhibits hypothalamic release of what
hormone? And what hormones of the anterior pituitary?
6. What is produced by the sustentacular (Sertoli) cells in the
testes which also inhibits FSH secrection and therby
inhibits sperm production?
What are the primary sex organs that produce sperm and hormones?
What is a pouch of skin and superficial fascia that hangs at the roof of the penis?
The temperature must be about ... degrees lower to be essential for sperm life.
What divides into right and left halves that provides compartments for each testicle?
What is the smooth muscle in the superficial fascia? Contraction of this muscle "shrinks" the scrotum.
What is the skeletal muscle that arises from the internal oblique muscles of the trunk? Contraction elevates the testes and brings it closer to the body wall.
Each testicle is approximately how many cm long? And it is 2.5 cm in diameter and is surrounded by two tunics.
What is the outer tunic of the testicles called?
What is the inner tunic "white coat" of the testicles called?
The tunica albuginea divides the testes into what?
Each lobule contains one to four tightly coiled what?
What are the "sperm factories" where cells undergo the process of spermatogenesis in producing viable sperm?
interstitial cells (Leydig cells)
What are located in tissue surrounding seminiferous tubules? They produce the hormone testosterone.
What is the connective tissue sheath entering the scrotum? Encloses blood vessels, nerve fibers and vas deferens. (inguinal canal, inguinal hernia).
Testicular arteries arise from what?
What forms a network called the pampiniform plexus around the artery?
What absorbs heat and effectively cools arterial blood before it enters the testes?
The testes are served by both divisons of the (autonomic/somatic) nervous system.
The accessory organs form the ... system.
What is the comma shaped coiled tube approx. 20 ft long that receives immature sperm from the testes and functions as a temporary storage site for sperm?
During ejactulation, smooth muscle in the walls of the epididymis contract and expel sperm into what?
How many inches long are the vas deferens?
The vas deferens begins in the scrotal sack, runs upward from the epididymis through the inguinal canal into the pelvic cavity, enclosed within the what?
What does the ductus (vas) deferens join with the form the ejaculatory duct?
What passes through the prostate gland and merges with the urethra from the bladder?
During ejaculation, smooth muscle in walls create what type of waves?
Cutting, cauterizing or "corking" the ductus deferens
What runs from the bladder into the prostate gland where it meets with the ductus deferens?
Which urethra exits the prostate gland and travels to the root of the penis?
What runs through the length of the shaft of the penis and opens as the urethral orifice to the body's exterior?
The seminal vesicles produce about ...% of the fluid volume of semen.
What gland produces a secretion that is a milky alkaline fluid that accounts for up to one third of the semen volume? It plays a role in activating sperm.
What glands produce thick clear mucus that enters the urethra? It's secretions are released when a male becomes sexually excited.
What is the milky white fluid mixture of sperm and accessory gland secretions? It provides transport medium, nutrients, and contains chemicals that protect sperm and facilitate their movement.
What is the enlarged end of the shaft of the penis?
What is the cuff of skin around the proximal end of the glans penis? This is the tissue that is removed by circumcision.
Internally, the penis contains the (spongy) urethra and how many columns of erectile tissue?
What is the spongy network of connective tissue and smooth muscle riddled with vascular spaces?
During an erection, the vascular spaces fill with blood during sexual excitement which causes the penis to enlarge and become rigid. Which division of the autonomic system controls this?
What is the column of erectile tissue surrounding the urethra?
What are paired dorsal columns of erectile tissue?
What is the diamond shaped region between the pubic symphysis anteriorly, the coccyx posteriorly, and the ischial tuberositites laterally?