venous sinuses definition
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venous sinus venous sinus in Medicine Expand. venous sinus n. A cavity at the caudal end of the embryonic cardiac tube in which veins from the intra- and extraembryonic circulatory arcs unite. In adults it develops into the sinuses of the venae cavae.
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What type of blood vessel is the coronary sinus? The coronary sinus is a large collection of blood vessels that deliver deoxygenated blood to the right atrium of the heart. It is present in all mammals.
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Straight sinus It forms from the confluence of the inferior sagittal sinus and great cerebral vein. The straight sinus is an unpaired area beneath the brain which allows blood to drain from the inferior center of the head outwards posteriorly. It receives blood from the inferior sagittal sinus, great cerebral vein, posterior cerebral veins, superior cerebellar veins and veins from the falx cerebri.
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Sinus venosus The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In mammals, it exists distinctly only in the embryonic heart (where it is found between the two venae cavae); in nonmammalian chordates, however, the sinus venosus persists in the adult.n the adult, it is incorporated into the wall of the right atrium to form a smooth part called the sinus venarum, also known as the venarum sinus, which is separated from the rest of the atrium by a ridge of fibres called the crista terminalis. The sinus venosus also forms the SA node and the coronary sinus.
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venous (vān) Any of the blood vessels that carry blood toward the heart from the body's cells, tissues, and organs. Veins are thin-walled and contain valves that prevent the backflow of blood. All veins except the pulmonary vein carry blood with low levels of oxygen. One of the narrow, usually branching tubes or supporting parts forming the framework of an insect's wing or a leaf.
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Venous ulcer Venous ulcer. Venous ulcers (venous insufficiency ulceration, stasis ulcers, stasis dermatitis, varicose ulcers, or ulcus cruris) are wounds that are thought to occur due to improper functioning of venous valves, usually of the legs (hence leg ulcers). They are the major occurrence of chronic wounds, occurring in 70% to 90% of leg ulcer cases.
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Venous thrombosis Venous thrombosis. A venous thrombus is a blood clot (thrombus) that forms within a vein. Thrombosis is a term for a blood clot occurring inside a blood vessel. A common type of venous thrombosis is a deep vein thrombosis (DVT), which is a blood clot in the deep veins of the leg. If the thrombus breaks off (embolizes) and flows towards the lungs, it can become a pulmonary embolism (PE), a blood clot in the lungs.
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Coronary sinus The anterior cardiac veins do not drain into the coronary sinus but drain directly into the right atrium. Some small veins known as smallest cardiac veins drain directly into any of the four chambers of the heart.
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- The paranasal sinuses (“the sinuses”) are air-filled cavities located within the bones of the face and around the nasal cavity and eyes. Each sinus is named for the bone in which it is located: Physiology.
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What is a dental sinus? A dental sinus is an abnormal channel that drains from a longstanding dental abscess associated with a necrotic or dead tooth. A dental sinus may drain to: the inside of the mouth (an intraoral sinus), or,
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Heart Anatomy The coronary sinus receives outflow from the great cardiac vein on the left and from the middle and small cardiac veins on the right. The great cardiac vein is the main tributary of the coronary sinus and drains areas of the heart supplied by the LCA. It begins at the apex of the heart, ascends in the anterior interventricular groove with the LAD artery, and enters the left end of the coronary sinus.
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- The superficial system comprises sagittal sinuses and cortical veins, which drain superficial surfaces of both cerebral hemispheres. The deep system consists of the lateral sinus, straight sinus and sigmoid sinus along with draining deeper cortical veins.Both of these systems mostly drain into internal jugular veins.he veins of the posterior fossa are variable in course, and angiographic diagnosis of their occlusion is difficult. The entire deep venous system is drained by internal cerebral and basal veins, which join to form the great vein of Galen that drains into the straight sinus.
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Picture of the Sinuses The sinuses are a connected system of hollow cavities in the skull. The largest sinus cavities are around an inch across; others are much smaller. The sinus cavities include: • The maxillary sinuses (the largest), in the cheekbones. • The frontal sinuses, in the low-center of the forehead. • The ethmoid sinuses, between the eyes, at the nasal bridge. • The sphenoid sinuses, in bones behind the nasal cavity.
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Chronic Venous Congestion Chronic Venous Congestion. in Pathology. Increased volume of blood in a particular tissue is known as congestion. It is a passive process, resulting from impaired outflow from a tissue. It may occur due to any generalized cause e.g. in cardiac failure. There may also be any local cause of obstruction.
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What are the paranasal sinuses? A sinus is a hollow, air-filled cavity in the skull that is connected to the nasal airway by a narrow hole in the bone (ostium). Normally all are open to the nasal airway through an ostium. Humans have four pair of these cavities each referred to as the: frontal sinus (in forehead)
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Anatomy of the Brain: The Meninges The dural infoldings form spaces between the two layers of the dura mater. 1  These spaces are called dural venous sinuses, and they collect blood from veins on the surface of the brain. Blood from the sinuses empties into the internal jugular veins. The sinuses include the following:
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- Blood enters the heart through the sinus venosus which drains into the atrium. The posterior cardinal sinuses receive blood from the posterior parts of the body and drain through the common cardinal veins into the sinus venosus.lood enters the heart through the sinus venosus which drains into the atrium. The posterior cardinal sinuses receive blood from the posterior parts of the body and drain through the common cardinal veins into the sinus venosus.
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sinus maxillary sinus - one of a pair of sinuses forming a cavity in the maxilla. nasal sinus, paranasal sinus, sinus paranasales - any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities. bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body.
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- Note multiple filling defects due to thrombosis in cavernous sinuses (solid arrows, B) and in left inferior ophthalmic vein (open arrows, B), which is one tributary of cavernous sinus. Also note heterogeneous enhancement of clival fat marrow (C, A).
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Internal jugular vein The internal jugular vein is the continuation of the sigmoid sinus. It begins in the posterior compartment of the jugular foramen, at the base of the skull.It is somewhat dilated at its origin, and this dilatation is called the superior bulb.It also has a common trunk into which drains the anterior branch of the retromandibular vein, the facial vein, and the lingual vein.t begins in the posterior compartment of the jugular foramen, at the base of the skull. It is somewhat dilated at its origin, and this dilatation is called the superior bulb. It also has a common trunk into which drains the anterior branch of the retromandibular vein, the facial vein, and the lingual vein.
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- Medical Definition of SINUS OF VALSALVA. : any one of the pouches of the aorta and pulmonary artery which are located behind the flaps of the semilunar valves and into which the blood in its regurgitation toward the heart enters and thereby closes the valves—called also aortic sinus.
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Venous Drainage of the Head and Neck Anatomically, the venous drainage can be divided into three parts: 1  Venous drainage of the brain and meninges: Supplied by the dural venous sinuses. 2  Venous drainage of the scalp and face: Drained by veins synonymous with the arteries of the face and scalp. These drain into the internal and external jugular veins. Venous drainage of the neck: Carried out by the anterior jugular veins.
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- The internal jugular vein is the continuation of the sigmoid sinus. It begins in the posterior compartment of the jugular foramen, at the base of the skull.It is somewhat dilated at its origin, and this dilatation is called the superior bulb.he internal jugular vein is the continuation of the sigmoid sinus. It begins in the posterior compartment of the jugular foramen, at the base of the skull.
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- Venous blood. Venous blood is deoxygenated blood which travels from the peripheral vessels, through the venous system into the right atrium of the heart. Deoxygenated blood is then pumped by the right ventricle to the lungs via the pulmonary artery which is divided in two branches, left and right to the left and right lungs respectively. Blood is oxygenated in the lungs and returns to the left atrium through the pulmonary veins.