Anatomy and Morphology
While morphology deals with the study of the form of things, anatomy is the study of the structure or internal workings of things. To have a better understanding of the anatomy and morphology of animal tissues, the example of a cockroach is used to demonstrate. Periplaneta americana happens to be the most common species of cockroach. They are generally brown in colour.
Morphology of the Cockroach
Its morphology is quite easy to comprehend. An adult cockroach can be about 34 – 53 mm long with wings that extend beyond the tip of the abdomen in males. Common in all cockroaches are eyes, a mouth, salivary glands, antennae, brain, heart, colon, reproductive system, mid-guts, legs, esophagus, gastric caecea, fat bodies and malpighian tubules. Their eyes tend to possess more than a thousand lenses, allowing them to see multiple things at once and the body is segmented into three distinct regions, which are the head, thorax and abdomen, while covered by a brown colored hard exoskeleton which is made up of chitin. In each segment, the exoskeleton has hardened plates; called sclerites. The sclerites are called tergites; dorsally; and sternites; ventrally. The ventral and dorsal sclerites are joined together by a thin and flexible articular membrane. This is named the arthrodial membrane.
Anatomy of the Cockroach
When it comes to its anatomy, we begin with the alimentary canal that helps with digestion. It is further divided into foregut, midgut and hindgut. The first is muscular and helps crush the food, the second secretes digestive enzymes and the last plays a role in the absorption of water and salts. The blood vascular system happens to be open and poorly developed. The respiratory system is a network of trachea that opens through ten pairs of holes called spiracles and thin branching tubes carry oxygen to all parts. Now coming to the reproductive system, males and females have separate ones, hence dioecious. The male reproductive system of cockroach consists of a pair of testes from which a thin vas deferens arises and opens into
Now coming to the reproductive system, males and females have separate ones, hence dioecious. The male reproductive system of cockroach consists of a pair of testes from which a thin vas deferens arises. It opens into ejaculatory duct which further opens into male gonopore. Male gonapophysis represent the external genitalia. These are made up of chitin and are assymetrical. The sperms are stored in the seminal vesicles. These spermatophores are discharged during copulation. On the other hand the female reproductive system of cockroach consists of two large ovaries and each ovary is formed of a group of eight ovarian tubules or ovarioles which contain a chain of developing ova. Oviducts from each ovary unite into a single median oviduct called vagina, opening into the genital chamber.
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