External Anatomy of Rat:
The external anatomy consists the head (cranial region), neck (cervical region), chest (thoracic portion), pectoral (portion where forelegs attach), abdomen, pelvic (portion where hind legs attach), and tail. Though both sexes have teats, you can differentiate the male rat from the female rat. The male rat possesses a pair of large scrotal sacs next to the last pair of teats.
Internal Anatomy of Rat:
1. Neck and Thoracic Cavity:-
The salivary glands (soft tissues) can be located on the side of the neck; anterior to the salivary gland is the lymph node. The thyroid glands are present on each side of the trachea. Coming to the thoracic portion, the diaphragm (a thin muscle layer) is located, under which lies the heart in the center. On top of the heart, the thymus glands are present, which regulates the immune responses of the rat. The bronchial tubes and the large-sized lungs located in the thoracic part.
2.Abdominal Cavity:-
Below the thoracic region, is the abdomen. The major organs of abdomen include liver (dark-colored organ), stomach (beneath the liver), spleen (attached to the lower side of stomach), small intestine (highly coiled digestive organ), pancreas (between stomach and small intestine), large intestine or colon (continuation of small intestine that leads to anus), cecum (intermediate structure between small and large intestine), and rectum (just before anus).
3.Excretory and Reproductive System:-
The excretory system of a rat consists of kidneys, ureter (tube that connects kidney to bladder), and urinary bladder. For a male rat, the reproductive organs are testes (enclosed in the scrotal sac), epididymis (tube present on the upper side of testes), vas deferens (tubular structure originating from testes), seminal vesicles (at the side of urinary bladder), prostate gland (below the urinary bladder), and penis. The female reproductive organs of rat are uterine horns (below kidney), oviduct (tiny tube that connects uterine horn to ovary), and ovary.
coelentrata: da frst exprience carry out experiment dissection of rat,,best sgt!!
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