Blue arrow points at minor fissure in right lung. View Media Gallery Thymus The thymus is a bilobed lymphoid organ located in the superior mediastinum of the thorax, posterior to the sternum.
Atrioventricular valves AV Semilunar SL Valves The aortic and pulmo nary semilunar, SL valves guard the bases of the largest arteries stemming from the ventricles and prevent backflow into the associ ated ventricles.
The anterior interventricular sulcus cradles the anterior interventricular artery and also marks the anterior position of the septum, where the right and left ventricles separate.
See Article History Human skeletal system, the internal skeleton that serves as a framework for the body. The lymphatic capillaries coalesce to form larger meshlike networks of tubes that are located deeper in the body; these are known as lymphatic vessels.
It is pushed out through the capillary wall by pressure exerted by the heart or by osmotic pressure at the cellular level. A subcapsular or marginal sinus exists between the capsule and the cortex of the lymph node.
The pleura also forms the pulmonary ligament, which is a double layer of pleura that extends caudad along the mediastinum from the inferior pulmonary vein to the diaphragm. After the confluence of the small branches into bigger ones, 2 pulmonary veins, superior and inferior, are formed on each side.
When the ventricles contract and pressure rises higher than the pressure in the aorta and pulmonary trunk, the valves are forced open and their cusps flatten while blood rushes in.
The right AV valve, or tricuspid valve, has three flexible cusps. Because these tonsils are so closely related to the oral and pharyngeal airways, they may interfere with breathing when they become enlarged. Auricles increase atria volume slightly. Red arrows show both major fissures.
Discussed in this article as part of the axial skeleton is a third subdivision, the visceral, comprising the lower jawsome elements of the upper jaw, and the branchial arches, including the hyoid bone.
The left lung comprises 8 segments: Lymph contains nutrients, oxygen, and hormones, as well as toxins and cellular waste products generated by the cells. The ventricles are the discharging chambers, the actual pumps of the heart.
There also are bands of fibrous connective tissue —the ligaments and the tendons —in intimate relationship with the parts of the skeleton.
This framework consists of many individual bones and cartilages. The great majority of the skeletal muscles are firmly anchored to the skeleton, usually to at least two bones and in some cases to many bones.
No accepted terminology for subsegmental bronchi exists. As the interstitial fluid accumulates, it is picked up and removed by lymphatic vessels that pass through lymph nodes, which return the fluid to the venous system.
In this article the parts of the skeleton are described in terms of their sharing in these functions. Four pulmonary veins enter the left atrium.
The muscle bundles are called pectinate muscles because they look like the teeth of a comb. The fossa ovalis marks the spot where an opening, the foramen ovale, existed in the fetal heart. These are 1 the axialcomprising the vertebral column —the spine—and much of the skulland 2 the appendicularto which the pelvic hip and pectoral shoulder girdles and the bones and cartilages of the limbs belong.
These 4 veins typically join at or near their junction with the left atrium, and usually this common area is intrapericardial.
In contrast, the origin of the left pulmonary artery is situated anterior to the left mainstem bronchus. Discharging chambers The ventricles make up most of the volume of the heart.
The central nervous system lies largely within the axial skeleton, the brain being well protected by the cranium and the spinal cord by the vertebral column, by means of the bony neural arches the arches of bone that encircle the spinal cord and the intervening ligaments.
Like veins, lymphatic vessels have 1-way valves to prevent any backflow see the image below. The right ventricle pumps blood into the pulmonary trunk, which sends the blood to the lungs where gas exchange occurs. The vascular supply of the trachea and bronchial tree depends on branches from the inferior thyroid arteries, intercostal arteries, and bronchial arteries aortic branches.
Near the hilum and mediastinum, it reflects and becomes parietal pleura, which covers the inner surface of the respective hemithorax, and thus creates a potential space pleural space.
Structurally, the thymus is similar to the spleen and lymph nodes, with numerous lobules and cortical and medullary elements. After maturation, they enter the blood and go to other lymphatic organs, where they help provide defense. The internal partition that divides the heart longitudinally is called the interatrial septum where it separates the atria, and the interventricular septum where is separates the ventricles.
View Media Gallery Each lung is covered by the visceral pleura, which covers the surface of the lung and dips into lobar fissures. Lacteals are lymph vessels that transport intestinal fat and are localized to the GI tract.Describe the pleura of the lungs and their function; A major organ of the respiratory system, Gross Anatomy of the Lungs.
The lungs are pyramid-shaped, paired organs that are connected to the trachea by the right and left bronchi; on the inferior surface, the lungs are bordered by the diaphragm. Describe the gross anatomy of the kidney and its coverings.
•The kidneys are bean-shaped organs that lie retroperitoneal in the superior lumbar region. •The medial surface is concave and has a renal hilus that leads into a renal sinus, where the blood vessels, nerves, and lymphatics lie.
Gross Anatomy of Urine Transport Gross Anatomy of the Kidney Microscopic Anatomy of the Kidney Describe the external structure of the kidney, including its location, support structures, and covering; External Anatomy.
describe the gross and microscopic anatomy of the stomach J shape organ, inner curvature is called the lesser curvature and the outer is called the greater curvature.
the stomach has four regions:funds (top) cardiac (oriface) body (main portion) pyloric (narrow inferior). Heart chambers and associated great vessels. The heart has four chambers – two superior atria and two inferior ventricles.
The internal partition that divides the heart longitudinally is called the interatrial septum where it separates the atria, and the interventricular septum where is separates the ventricles. The right ventricle forms most of the anterior surface of the heart, while the left ventricle forms the heart apex.
Describe the external [gross] and internal anatomy of the kidney, its coverings and location in the body Bean shaped, located retroperitoneal in superior lumbar region Renal hilum - .Download