Tag: frog

Frog exhibit sexual dimorphism. Male and female are distinguishable externally only during breeding season when the male develop roughed nuptial pads on the bases of the thumb. Nuptial pads help male in holding female, a sexual embrace called am plexus.

In frog, pancreas is made up of lobules, connective tissue and islets of langerhans. The islets of Langerhans secrete a hormone known as insulin. The pancreatic juice contains three enzymes. The trypsin, amylopsin and stoop sin or lipase.

Stomach of frog comprises a large broader anterior part called cardiac stomach and a short narrower posterior part called pyloric stomach. Fundic stomach is absent.

Stomach is followed by a coiled small intestine made of a small anterior duodenum and much longer posterior ileum. Jejunum is absent in frog.

Renal portal system of frog drains blood from hind limbs and posterior part of the trunk and supplies to the kidneys.

Ciliated columnar epithelium comprises columnar cells which have cilia on free surface. This epithelium lines most of the respiratory tract and fallopian tubes.

A large twisted spiral valve divides incompletely the cavity of pylangium into a left dorsal cavum  pulmocutaneum and right ventral cavum aorticum.

Glands of swammerdam are soft chalky masses of calcareous bodies found in the dorsal root ganglion of spinal nerve in frog. These form reserve supplies of calcium.

Bidder's canal is present in the kidney of male frog. It is helpful in the transfer of sperms from the vasa differential to water.