Pig Dissection: Excretory/Reprod/Internal Kidney Structures

urogenital opening

opening to both the urinary and reproductive systems

urethra

transports urine from the bladder to outside of body (carries sperm to penis in males)

Bladder

stores and empties urine

Ureter

carry urine from the kidneys to the urinary bladder

Body of uterus

nourish the developing fetus prior to birth

Horn of the uterus

enabling site for embryo development, support sperm transport to oviducts

Cervix

connects uterus and >agina and allows fluids such as menstrual blood to pass

Name the parts of the uterus

Horn, body, and cervix

Ovary

Produce eggs and hormones for menstruation and pregnancy

Uterine Tube

A passageway for an egg and sperm to meet

>agina

connects the cervix to the outside of the body

Bulbourethral gland

responsible for pre ejaculation fluid, lies on sides of urethra anterior to pen!s

• lubricant, forms a mucus channel for sperm to swim

• Neutralizing agent to balance acidity of urine present in urethra

Ductus Deferens

transports sperm, leads from the epididymis back into abdominal cavity

Epididymis

A narrow coiled tube attached to each of the testes, protects/matures/stores sperm

Pen!s

used for urination and sperm release

Seminal Vesicles

produce the majority of the fluid that makes up semen:

• fructose- energy source

• Prostaglandins that suppress the female immune system; stimulate uterine contraction

• Vitamin C for sperm survival

• Amines are an alkaline fluid that neutralize the vagina’s acidity

• A coagulant that prevents semen content diffusion, holds semen in place, and blocks the path of other sperm

• 60% semen volume

Testes

produce sperm and secrete testosterone, an anabolic steroid that regulates the development of sperm, secondary sex characteristics, bone and muscle mass, and sex drive

Renal Cortex

outer portion of kidney interior, essential for blood filtration

Renal Medulla

regulates concentration of urine

Renal pelvis

urine is collected here and funnelled into ureter

Nephron site

responsible for processes of filtration, reabsorption, secretion, and excretion, which produce urine.

Kidney pathway (urine formation)

Blood from ureter > renal pelvis > renal medulla > renal cortex > nephron site

Prostate gland

• Citrate, an anti-coagulant that liquifies semen for efficient swimming

• Zinc, stabilizes DNA

• Alkaline fluid to protect sperm

• Grows throughout male’s lifetime, problems with enlargement common after 40