17 Questions
What are the mechanisms of erection in bulls?
Sexual excitement, stimulation of nervi eregentis, contraction of erector muscles, relaxation of retractor penis muscle, continuous blood inflow
What is the role of the tunica albuginea in bull penises during erection?
The tunica albuginea helps to maintain hardness without increasing the size of the penis.
How is erection controlled in bulls?
Erection and copulation are controlled by parasympathetic nerve fibers.
How long does it take for a bull to achieve erection and copulation?
2-3 minutes
Explain the significance of the rapid onset of erection in bull penises.
The few cavernous tissues in the penis allow for a quick onset of erection with relatively less blood.
What is the role of nervi eregentis in the penis?
Stimulation of vasodilatation to cavernous tissue
Describe the mechanism of erection in stallions.
Erection and copulation are controlled by parasympathetic nerve fibers, taking 5-15 minutes to occur.
How does ejaculation occur in stallions?
Ejaculation occurs in jets or fractions and takes about 10 – 40 seconds.
What are the main hormones involved in male endocrinology?
GnRH, FSH, LH, testosterone, estradiol, inhibin
Where is testosterone synthesized in males?
Leyding cells
What are the main functions of the ischeocavernous and bulbocavernous muscles in the penis?
Contraction of erector muscles at the root of the penis
What are the typical pelvic movements of a bull during copulation?
Several rapid rhythmic pelvic forward and backward movements
How does ejaculation occur in bulls, buffalo bulls, bucks, and rams?
With quick thrust of the penis
What stimuli initiate ejaculation in bulls?
Stimulation of the glans penis
What is the main difference in the ejaculation process between stallions, camels, and boars compared to bulls, buffalo bulls, bucks, and rams?
Intrauterine deposition of semen vs. intravaginal deposition of semen
How does the male dismount after ejaculation?
The penis retracts into the prepuce
What is the significance of lumbo-sacral section bending in the ejaculation process?
Dorso-convex bending facilitates ejaculatory thrust reflex
Explore the physiological processes involved in the male sexual response, including vasodilatation to cavernous tissue, contraction of erector muscles, and control by parasympathetic nerve fibers. Understand how continuous blood flow and delayed onset of erection contribute to the full erection and hardness of the penis.
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