Circulatory System 6. 25.30). Thin branching tubes (tracheal tubes subdivided into tracheoles) carry oxygen from the air to all the parts. The 10th tergum is large and notched in the middle and projects backwards beyond the body. Each lobule contains several types of cells. The crop is very large part of the alimentary canal of the cockroach where food is stored. These are also paired but thin, small un-jointed outgrowths, which project backwardly from the sides of the 9th sternum of the male cockroach only. The 7th tergum covers the 8th tergum in male and 8th and 9th terga in the female cockroach. References. The incredible ibex defies gravity and climbs a dam | Forces of Nature with Brian Cox - BBC - Duration: 3:53. The heart (Fig 25.31) is an elongated tube, which runs through the whole length of the thorax and abdomen as a dorsomedian con­tractile vessel. Expansion of the body cavity allows the space inside the tracheae to expand. The fat body of cockroach is functionally analogous to the liver of vertebrates. The respiratory system is a network of the trachea that opens through ten pairs of holes called spiracles, and thin branching tubes carry oxygen to all parts. A large amount of water and bicarbonates of potassium and sodium are reabsorbed by the cells of Malpighian tubules and then transferred to the blood (haemolymph). These are the long tubules of utricular gland of the male cockroach are also. (i) Dor­sal or pericardial sinus is present on the dorsal side below the terga and encloses the heart; (ii) Middle or perivisceral sinus is the largest and encloses most of the viscera concerned with the systems of digestion respiration, excretion, reproduction etc. The respiratory system consists of trachea that opens to the exterior through 10 pairs of spiracles, which are located on the lateral side of the body. It contains the heart, the digestive organs, trachea or respiratory tubes, reproductive system and sensory organs. The abdomen bears the following apertures: The waste matter is expelled out from the posterior most part of the alimentary canal, the anus. A segment is partially covered at the anterior end by its preceding segment. It is connected with the hind brain by the frontal connectives. Middle layer of the spermatophore is formed by the secretion of the ejaculatory duct. Metathoracic wings are attached with the anterolateral margin of the metathoracic tergum. It consists of two salivary glands and two receptacles with their ducts (Fig. Such an image is called mosaic image and the eye is said to have mosaic vision. The top of the head capsule is known as vertex. These are in the form of hairs, bristles, plates, spines, etc. Foregut- It is also known as stomadaeum and is divided into buccal chamber, pharynx, oesophagus, crop, and gizzard. Ovaries are situated in the abdomen. A typical abdominal segment is enclosed by four sclerites. These cells contain symbiotic bacteria which help in synthesis of some amino acids and vitamins and of glycogen from glucose. Three nerves arise from the occipital ganglion. 28). They also produce obnoxious smell in kitchens and stores. The pericardium also bears a number of perforations and as a result, the pericardial cavity is in communi­cation with the perivisceral cavity or the haemocoel. The sub-mentum and mentum are together called as post-mentum, which probably represents the fused cardos, while pre-mentum is perhaps the fused portion of two stipes. A Labelled Diagram Of Neuron with Detailed Explanations. There are two yellowish ovaries, one on either side of the alimentary canal. The fused base form two sclerites, submentum and mentum. Each gland has two glandular portions and a salivary reservior. A pair, on the dorsolateral sides of the oesophagus, just behind the brain. Hepatic caecae are lined by the glan­dular cells which secrete digestive secretion containing amylolytic, pro­teolytic and lipolytic types of enzymes. They are numerous small sacs which store the sperms. They are formed by a large number of visual elements, the ommatidia (sing ommatidium). From each spiracle leads inward a small tube which ends in a stout trachea and all of them are connected by longitudi­nal and transverse tracheae. The cells in the lining epithe­lium of the caeca are believed to secrete digestive enzymes. It is formed by the fusion of six segments. Endocrine organs, corpora cardiaca, cor­pora allata and prothoracic glands constitute the endocrine system. The nervous system of cockroach is divisible into three groups. Thereafter the heart and the anterior aorta contract penstaltically from behind to forward and thus the blood from the heart is circulated to the head sinuses and then it reaches the perivisceral and perineural sinuses. Digested food is absorbed by the internal lining of the mid-gut and also by the hepatic caecae through diffusion. The retinular pigment sheath surrounds the region of retinular cells. The nymphs undergo several moultings and the stage between two suc­cessive moultings is called instar. It con­sists of an outer transparent corneagen layer of flattened cells; 3 to 5 retinular cells; one rhabdome formed by the inner margins of the retinular cells. It is formed by the fusion of three pairs of ganglia. Eight occur on each side of the abdomen between terga and sterna of the first eight segments. It corresponds to the maxillary palp of the first maxilla. Thus, after following the correct procedures we were able correctly dissect, label, and determine the body parts of a cockroach. The six abdominal ganglia are situated in the first, second, third, fourth, six and seventh segments of the abdomen. Maxillae are also called pro-notum, which runs back­wards, inwards and downwards takes... 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