lecture 31: male reproductive sys

Question 1

organs

Answer 1

gonads
sys of ducts
accessory sex glands
supporting structures

Question 2

urology

Answer 2

study of urinary sys

Question 3

scrotum

Answer 3

• supporting structure
• outpouching of anterior abdominal wall
• raphe
• scrotal septum; dartos muscle
• protection
• temp reg: 2 muscles contract in response to cold temperatures to maintain testicular temp; the cremaster, the dartos

Question 4

testes

Answer 4

• male gonads
• partially covers the tunica vaginalis; internal to the visceral layer is the tunica albuginea

Question 5

what are the seminiferous tubules lined with?
(what cells)

Answer 5

• seminiferous tubules are lined w two types of cells: spermatogenic cells, nurse (sertoli) cells
• in spaces between adjacent seminiferous tubules are clusters of interstitial endocrine (leydig) cells

Question 6

how do sperm move from the seminiferous tubules

Answer 6

by a sys of ducts within the testes toward the epididymis where they complete their maturation

Question 7

epididymis

Answer 7

located within the tunica vaginalis and consists mostly of the ducts of the epididymis
has: head, body, tail
- transport sperm during ejaculation into ductus deferens

Question 8

ductus deferens

Answer 8

• ascend from tail of epididymis
• features: dilated terminal portion referred to as the ampulla
• transport sperm during ejaculatin into the ejaculatory ducts

muscular tube that carries sperm from the epididymis in the testes to the ejaculatory ducts in the prostate gland

Question 9

ejaculatory ducts

Answer 9

• union of the duct of the seminal gland and the ampulla of the ductus deferens
• originate superior to the prostate and terminates in the prostatic urethra

delivers sperm into the urethra

Question 10

male urethra

Answer 10

serves as a passageway for both semen and urine and consists of three regions:
- prostatic urethra
- membranous urethra
- spongy urethra

Question 11

spermatic cord

Answer 11

• passes thru the inguinal canal to enter the pelvic cavity
• contains neurovascular structures

Question 12

accessory sex glands

Answer 12

• secrete most of the liquid portion of semen
• accessory glands in males: seminal glands, prostate, bulbourethral glands

Question 13

seminal glands

Answer 13

• lateral to ampulla of vas deferens
• secretes an alkaline fluid referred to as seminal fluid which accounts for approx 60% of the volume of semen

Question 14

prostate

Answer 14

• inferior to urinary bladder surrounding the prostatic urethra
• secretes an acidic fluid that contains: citric acid, proteolytic enzymes
• prostatic secretions enter the prostatic urethra via prostatic ducts and account for approx 25% of volume of semen

Question 15

bulbourethral glands

Answer 15

• inferior to the prostate on either side of membranous urethra
• secretes an alkaline fluid that contains mucous
• secretions enter the spongy urethra via 2 bulbourethral ducts

Question 16

penis

Answer 16

• supporting structure
• passageway for ejaculation of semen and excretion of urine
• cylindrical and consists of 3 regions: root, body, glans penis

Question 17

root of penis

Answer 17

has the bulb, and crura of the penis

Question 18

body of penis

Answer 18

• composed of 3 cylindrical masses of erectile tissue that are individually surrounded by the tunica albuginea: one smaller midventral corpus spongiosum penis, 2 dorsolateral corpora cavernosa penis

Question 19

glans penis

Answer 19

• slightly enlarged distal end of the corpus spongiosum penis; margin is the corona
• distal urethra enlarges with the glans penis to form the external urethral oriice
• covering the glans penis is the prepuce

Question 20

Erections

Answer 20

• parasympathetic fibres from sacral portion of the spinal cord initiate and maintain an erection
• ejaculation is a sympathetic reflex from the lumbar portion of the spinal cord
• peristaltic contraction of the system of ducts and the accessory sex glands propel a small volume of semen into the spongy urethra
  process known as emission