What is the pericardial sinus?
The transverse pericardial sinus is the transverse communication between the left and right parts of the pericardial space proper behind the two outflow arteries of the heart.
What is sinuses in cockroach?
In cockroaches, sinus may refer to an irregular venous or lymphatic cavity, reservoir, or dilated vessel. it lies in the haemocoel. Hemocoel is a space filled with hemolymph in organisms with open circulatory systems like cockroach.
What are insect sinuses?
To facilitate circulation of hemolymph, the body cavity is divided into three compartments (called blood sinuses) by two thin sheets of muscle and/or membrane known as the dorsal and ventral diaphragms.
Where is sinuses in open circulatory system?
Open circulatory systems lack veins, so the hemolymph is returned to the heart through a series of efferent sinuses that ultimately join with the large mid-dorsal pericardial sinus. Blood pooled in the pericardial sinus is drawn into the heart through three pairs of ostia (pores) when the heart relaxes (Figure 32.17).
How are pericardial sinuses formed?
Pericardial reflections surrounding the venae cavae and pulmonary veins give rise to the oblique sinus, and the transverse sinus is formed by pericardial reflections around the proximal portions of the pulmonary artery and ascending aorta (Fig. 23-1).
How many pericardial sinuses are there?
There are two Pericardial sinuses: transverse and oblique. The cul-de-sac enclosed between the limbs of the inverted U of the venous mesocardium lies behind the left atrium and is known as the oblique sinus.
How many sinuses are present in cockroach?
The hemocoel (body cavity where blood flows) of cockroach is divided into 3 sinuses due to the presence of a ventral and dorsal diaphragm. The pericardial sinus is present above the dorsal diaphragm. The perivisceral sinus is present in between the dorsal and ventral diaphragm.
What is ganglion in cockroach?
The supra-oesophageal ganglion or cerebral ganglion is a bilobed structure situated in the head in front of oesophagus, above the tentorium and almost between the bases of the antennae. It is formed by the fusion of three pairs of ganglia. It represents the brain and is concerned chiefly with sensory function.
Why is insect blood important?
Circulatory system of a generalized insect. The circulating hemolymph, or blood, is not important in respiration but functions in transporting nutrients to all parts of the body and metabolic waste products from the organs to the malpighian tubules for excretion.
What is open and closed circulatory system?
What is open and closed circulation? In the open circulation, the blood is not enclosed in the blood vessels and is pumped into a cavity called hemocoel. On the contrary, in the closed circulation, the blood is pumped through the vessels separate from the interstitial fluid of the body.
What does closed circulatory system mean?
Closed circulatory systems (evolved in echinoderms and vertebrates) have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.
What is Comtrex severe cold&sinus?
Comtrex Severe Cold & Sinus is a combination medicine used to treat headache, fever, body aches, runny or stuffy nose, sneezing, itching, watery eyes, and sinus congestion caused by allergies, the common cold, or the flu.
Can Comtrex cause a stuffy nose?
Dilated blood vessels can cause nasal congestion (stuffy nose). Comtrex Severe Cold & Sinus is a combination medicine used to treat headache, fever, body aches, runny or stuffy nose, sneezing, itching, watery eyes, and sinus congestion caused by allergies, the common cold, or the flu.
What are the symptoms of sinus congestion?
Because of the nasal congestion, you probably won’t be able to smell or taste as well as normal. Your voice may sound “stuffy.” The relentless pressure and swelling in your sinuses can give you symptoms of a headache. Sinus pain can also give you earaches, dental pain, and pain in your jaws and cheeks.
Where are the sinuses lined with mucus?
Like the nasal cavity, the sinuses are all lined with mucus. The mucus secretions produced in the sinuses are continually being swept into the nose by the hair-like structures (called ‘cilia’) on the surface of the respiratory membrane.