UH BIOL 1344 - Male Reproductive System (2 pages)

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Male Reproductive System

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Male Reproductive System


Lecture Notes for the Male Reproductive System

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Lecture Note
University of Houston
Biol 1344 - Hum Anat Physiol
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BIOL 1344 Lecture 25 Outline of Last Lecture I Body Fluids and Water Levels II Acids and Bases in the Body III Introduction to Male Reproductive System Outline of Current Lecture I Conditions of the Testes II Other Reproductive Male Organs III Sperm Formation Current Lecture Continuing the lecture on the male reproductive system mitosis occurs in testes but not in ovaries in the female Unilateral anorchia is a condition where the person only has one testes Bilateral anorchia both are missing Oligospermia means a low sperm count Inside testes there are 250 lobules seminiterous tubules and rete testis Leading out of the testis is the epididymis which is 18 20 feet sperm are stored here for about 2 weeks and then if they are not expelled they are eaten through phagocytosis Surrounding the testis is the tunica vaginalis with both parietal and visceral layers with a space filled with fluid between If there is too much fluid around the testes this is called hydrocele The inner layer from this is tunica albuginea Hypospadia is a condition in which the urethra opens on the underside of penis this can also be in females into the vagina Seminal Vesicle responsible for 65 of ejaculate which has prostaglandins alkaline pH fructose and vesiculase causes clotting of ejaculate Prostate 30 35 of ejaculate citrate acid phosphatase fibrinolysin causes liquefaction of ejaculate PSA is prostate specific antigen if it is high that is a marker for cancer or prostatisis inflammation It takes about 60 84 days to form sperm Process goes from spermatogonium primary spermatocyte secondary spermatocyte spermatid goes through spermigenesis sperm Sertoli cells aka sustentacular cells secretes anti mullerian hormone male system inhibin These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute inhibits FSH which stimulates spermatogenesis and androgen binding protein transports testosterone Leydig Cells are between tubules and are also known as interstitial cells They produce testosterone and DHT dihydrotestosterone around 7 8 weeks of development This results in male external genitalia If DHT is missing the baby will not be male Penis surrounded by tunica albuginea Penile erection is through parasympathetic input but sympathetic input is needed for peristalsis in vas deferens Voluntary skeletal muscles play a role in ejaculation Guanylate cyclase turns GTP into cGMP which pushes potassium out cGMP turns into GMP potassium channels close resulting in depolarization contraction vasoconstriction and the erection is terminated In the testes there are dartos and cremaster muscles which both relax when they get too hot The head of sperm is acrosome hyaluronidase helps to penetrate the zona pellucide in the vagina Sperm travels about 3 5 cm min

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