The Urogenital System Of A Frog

Front 1

A flat, elongated organ dark in color. This pair lies in the sub-vertebral lymph sac dorsal to the pleuroperitoneal cavity.

Back 1

Kidney

Front 2

A pair of white tubes that run along the cloaca. Lateral to the mesonephric duct is a vessel, the renal portal vein. The male mesonephric duct is bigger than the female.

Back 2

Wolffian ducts

Front 3

A large bilobed membaranosus sac attached and opened to the ventral surface of the cloaca. The mesonephric duct conducts the urine from the kidney to the cloaca.

Back 3

Urinary bladder

Front 4

A pair of oval or elongated cylindrical yellowish bodies lying on the ventral surfaces of the kidneys.

Back 4

Testes

Front 5

Delicate minute tubules conducting the sperm cells to the kidney.

Back 5

Vasa efferentia

Front 6

Each testis is attached to the kidney then to the dorsal body by a mesentery known as the ______

Back 6

Mesorchium

Front 7

Yellowish fat finger-like bodies on top of the testes.

Back 7

Corpora adiposa

Front 8

Varies greatly in size at different seasons of the year. When these are filled wtih eggs, they greatly distend the body walls. These are dark organs attached to the ventral surface of the kidneys then to the dorsal body by a mesentery, the mesovarium.

Back 8

Ovary

Front 9

Paired white coiled tubes lying lateral to the kidneys. They vary in size at different seasons, like the ovaries. When ovaries are filled with eggs, the oviducts become dilated and very conspicuous. This serves as the passage of eggs released from the ovary to the ovisac.

Back 9

Oviducts

Front 10

The openings of the oviducts into the pleuroperitoneal cavity located at the anterior ends of the oviducts and situated close to the anterior ends of the left and right lobes of the liver.

Back 10

Ostia

Front 11

Thin-wall expanded posterior portions of the oviducts which open into the cloaca.

Back 11

Ovisacs

Front 12

A space at the lateral border of the kidney lined by a thin simple squamous epilethium or endolethium and usually filled up with blood cells.

Back 12

Renal portal vein

Front 13

A smaller space located inner to the renal portal vein, and also at the lateral border.

Back 13

Mesonephric duct

Front 14

A small mass of epilethial cells on the median ventral surface of the kidney. This is an endocrine gland which secretes several hormones.

Back 14

Adrenal gland

Front 15

Empty structures of varied forms and lined by simple cuboidal epilethium. These are so numerous in one section, and form the bulk of the kidney structures. The tubules are for the passage of urine in the kidney and for males, also serve as the passage of sperm cells.

Back 15

Uniferous tubules

Front 16

These are few solid masses of rounded bodies that appear very different from the uriniferous tubules. Each corpuscle is composed of a glomerulus and bowman's capsule.

Back 16

Malpighian bodies

Front 17

A network of arterial capillaries located at the center.

Back 17

Glomerulus

Front 18

A thin cup-shaped double membrane structure that encloses the glomerulus.

Back 18

Bowman's capsule

Front 19

The thin outermost covering of the testis and is lined by simple squamous epilethium.

Back 19

Visceral peritoneum

Front 20

Small cavities located in the connective tissue spaces between the seminiferous tubules in the testes. These may be filled up with blood cells which may appear pinkish in color due to stain.

Back 20

Blood vessels

Front 21

Oval or rounded cells; found outside the blood vessels and are embedded in the interstitial connective tissue. These are endocrime cells that excrete testosterone.

Back 21

Interstitial cells of Leydig

Front 22

Compartent-like structures which fill up the interior of the organ. This sites of spermatogenesis and contains spermatozoa and spermatocytes.

Back 22

Seminiferous tubules

Front 23

A group of small rounded cells with compact dark nuclei located at the center of the cells. They are usually located next to the wall of the seminiferous tubules. These cells can undergo mitotic cell division.

Back 23

Spermatozoa

Front 24

A group of cells with granular nuclei. The cells are of two kinds found separately: primary and secondary.

Back 24

Spermatocytes

Front 25

Big cells in the seminiferous tubules.

Back 25

Primary spermatocytes

Front 26

Small cells whose nuclei are similar to those of the primary spermatocytes. These cells undergo second meiosis and give rise to spermatids.

Back 26

Secondary spermatocytes

Front 27

A small, dark blue in color, with a relatively large nucleus and adhere to the inner surface of the ovary wall. In the nucleus are several small dark staining bodies, the nucleoli. The nucleus of the egg is termed the germinal muscle. The cytoplasm is smooth and contains no yolk.

Back 27

Oogonium

Front 28

Bigger and less dark in color than the oogonium. The nucleus of each cell is centrally located. At the peripheral region of the young oocyte are smaller rounded spaces. The yolk sphereules in the cytoplasm are few and indistinct. They begin to move away from the ovary wall.

Back 28

Young oocyte

Front 29

A very large cell with usually stained purple. The nucleus is located in one side of the egg above the center. The part with a dark surface and nucleus is the animal pole. The light surface is the vegetal pole.

Back 29

Old oocyte

Front 30

Small spherical or ovoid globules that are embedded in the cytoplasm of the oocytes.

Back 30

Yolk materials or yolk spherules

Front 31

A very thin non-cellular layer immediately around the young and old oocytes.

Back 31

Vitelline membrane

Front 32

Found as a single later of flattened cells with elongated or oval nuclei adhering to the outer surface of the vitelline membrane. The gradual increase in size of the developing eggs in the ovary is attained by the synthesis as accumulation of yolk materials which are used as food reserve for the embryo.

Back 32

Follicular or nurse cells