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Medical Instructor, University of Texas at Tyler
Connections Fornix projects from the hippocampal formation to the septal nuclei (pre-commissural fornix) and to the mammillary body (post-commissural fornix) asthma definition signs symptoms purchase advair diskus 250mcg on line. Stria medullaris of the thalamus connects the septal nuclei to the habenular nucleus asthma treatment dulera order 500mcg advair diskus with amex. Hippocampus projects to the septal area asthma symptoms at night buy line advair diskus, the subiculum projects to the mammillary bodies, whereas the dentate gyrus does not project beyond the hippocampal formation. Papez circuit: Hippocampal formation mammillary bodies anterior nucleus of thalamus cingulate gyrus Hippocampal formation. Functions 286 Limbic system is associated with behavior, emotions, motivation, olfaction and memory. Clinical signs include memory disturbances (amnesia), confabulation, and temporo-spatial disorientation. In the Papez circuit of the limbic system, between which combination is the hypothalamus placed on the basis of function Reticular System the reticular formation is a set of interconnected nuclei that are located throughout the brainstem. The reticular formation is not anatomically well defined because it includes neurons located in diverse parts of the brain. The neurons of the reticular formation all play a crucial role in maintaining behavioral arousal and consciousness. The modulatory functions are primarily found in the rostral sector of the reticular formation and the premotor functions are localized in the neurotns in more caudal regions. The reticular formation is divided into three columns: raphe nuclei (median), gigantocellular reticular nuclei (medial zone), and parvocellular reticular nuclei (lateral zone). The raphe nuclei are the place of synthesis of the neurotransmitter serotonin, which plays an important role in mood regulation. It is essential for governing some of the basic functions of higher organisms and is one of the phylogenetically oldest portions of the brain. The reticular formation has been functionally cleaved both sagittally and coronally. In contrast, lesioning of the more caudal portion of the reticular formation produces insomnia in cats. This study has led to the idea that the caudal portion inhibits the rostral portion of the reticular formation. The raphe nuclei form a ridge in the middle of the reticular formation, and, directly to its periphery, there is a division called the medial reticular formation. Medial and Lateral Reticular Formation the medial reticular formation and lateral reticular formation are two columns of neuronal nuclei with ill-defined boundaries that send projections through the medulla and into the mesencephalon (midbrain). The nuclei can be differentiated by function, cell type, and projections of efferent or afferent nerves. These tracts function in maintaining tone, balance, and posture-especially during body movements. The reticular formation also relays eye and ear signals to the cerebellum so that the cerebellum can integrate visual, auditory, and vestibular stimuli in motor coordination.
Bone Table 15: Summary of bone types and their organization Types of bone Histological features Woven bone asthma bronchiale bei kindern buy 250mcg advair diskus fast delivery, newly calcified Irregular and random arrangement of cells and collagen; lightly calcified Lamellar bone asthma definition 9mm trusted advair diskus 250mcg, remodeled Parallel bundles of collagen in thin layfrom woven bone ers (lamellae) asthma attack 8 month old discount advair diskus 500 mcg overnight delivery, with regularly spaced cells between; heavily calcified. Compact bone, ~80% of all Parallel lamellae or densely packed oslamellar bone teons, with interstitial lamellae Cancellous bone, ~20% of all Interconnected thin spicules or tralamellar bone beculae covered by endosteum Major locations Developing and growing bones; hard callus of bone fractures All normal regions of adult bone Synonyms Immature bone; primary bone; bone. Mature bone; secondary bone Thick, outer region (beneath peri- Cortical bone osteum) of bones Inner region of bones, adjacent to Spongy bone; trabecular bone; marrow cavities medullary bone 174. All cells except osteoclasts originate from the mesenchymal stem cells, which differentiate into osteoprogenitor cells, osteoblasts, and finally osteocytes and bone lining cells. Bone-lining cells on external bone surfaces are part of the periosteum, hence the term periosteal cells. Bone-lining cells on internal bone surfaces are frequently called endosteal cells. Osteoclasts originate from hemopoietic progenitor cells, which differentiate into bone-resorbing cells. Table 16: Summary of cartilage features in bone Features Hyaline cartilage Elastic cartilage Fibrocartilage Location Percentage of all cells in the bone Function Bone surface, closing cone of resorption canals > 5% Deposits bone matrix; initiates mineralization by releasing matrix vesicles Cuboidal or polygonal, mononuclear cell; basophilic cytoplasm; negative Golgi. Table 17: Difference between compact and spongy bone Compact bone Spongy bone Density Haversian systems Arrangement of bony lamellae Location in bone Bone marrow Amount in the body by weight Dense like ivory Present Regular Outer region Absent 75% Porous like a sponge Absent Irregular Inner region Present 25%. The fibrous layer contains fibroblasts, while the osteogenic layer contains progenitor cells that develop into osteoblasts. The osteoblasts are responsible for increasing the width of a long bone and the overall size of the other bone types. After a bone fracture the progenitor cells develop into osteoblasts and chondroblasts, which are essential to the healing As opposed to osseous tissue, the periosteum has nociceptive nerve endings, making it very sensitive to manipulation. Endosteum is a thin vascular membrane of connective tissue that lines the surface of the medullary cavity of long bones. The osteoblasts and osteoprogenitor cells within the endosteum play an important role in remodeling and repair To prevent the bone from becoming unnecessarily thick, osteoclasts resorb the bone from the endosteal side. Endosteal surface is resorbed during long periods of malnutrition, resulting in less cortical thickness. The periosteum is highly active during fetal development, when it generates osteoblasts for the appositional growth of bone. Red Bone Marrow It is vascular and appears red in color due to presence of red blood cells. It consists of network of fine reticular fibers containing blood forming cells, showing all stages of development. At birth it is present in all the bones at all sites, and is an important site of haemopoiesis, but as the age advances the In adults the red marrow is found in the cancellous bone. The population of osteogenic layer of the periosteum is markedly diminished with age and remodelling of bone is in adult life is a very slow process, but osteoblasts below the endosteum are more active than those below the periosteum. Histology A sarcomere is defined as the segment between two neighbouring Z-lines (or Z-discs, or Z bodies). In electron micrographs of cross-striated muscle, the Z-line (from the German "Zwischenscheibe" the disc in between the, I-bands) appears as a series of dark lines. Within the A-band is a paler region called the H-zone (from the German "heller" brighter). H-band is the zone of the thick filaments that is not superimposed by the thin filaments.
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Plaquesmay rupture and produce vessel thrombosis asthma 2014 movie soundtrack buy advair diskus 500 mcg with visa, which leads to an acute myocardial infarction asthma treatment 2014 generic 500mcg advair diskus overnight delivery. Below L2 (level of renal arteries) asthma symptoms cdc order advair diskus 250mcg free shipping, the abdominal aorta lacks vasa vasorum and requires diffusion of nutrients from blood for its energy needs (Links 10-11 and 10-12). Reduction of cerebral blood flood flow secondary to atherosclerosis can cause cerebral atrophy (see Chapter 26). Atherosclerosis may involve circle of Willis vessels and/or the internal carotid artery (see Chapter 26). In later stages, matrix components produce collagen, proteoglycans, and elastin forming the mature fibrous plaque, the primary lesion of atherosclerosis. In this specially stained cross-section of a coronary artery, collagen is blue and the thrombus is red. Directly beneath the thrombus is a fibrous plaque (fibrous cap), which stains blue. The circle shows disruption of the fibrous plaque with cholesterol crystals extending through the wall to the lumen. E, Atheroemboli lodge in arterioles and smaller arteries of the kidneys (most common site for atheroemboli). Note the multiple cleft-shaped spaces, reflecting the empty space left after dissolution of the cholesterol by standard processing. These findings are typical of atheromatous embolization, and the fact that both feet are involved indicates a source above the aortic bifurcation. Organized thrombi (T), one of which was incised by the pathologist, are seen protruding from the endothelial surface. The earliest changes are small fatty streaks (F), visible as pale areas beneath the endothelium in the aortic segment on the left. The central segment shows pearly white fibrous plaque (P), and the segment on the right shows ulcerated advanced plaques with adherent platelet thrombi (T). Note the thick wall of the arteries, which is composed of distinct layers of smooth muscle cells and elastic laminae that separate these layers. The arrow depicts eosinophilic material representing protein that has leaked through the basement membrane and deposited in the wall of an arteriole. Hyperplastic arteriolosclerosis of an arteriole in the kidney in malignant hypertension due to systemic sclerosis. Definition: Arteriole occlusion that is caused by increased protein deposition within the vessel wall b. Pathogenesis (1) Increased protein is deposited in the vessel wall and occludes the arteriole lumen. There is hyaline wall thickening (hyaline arteriolosclerosis) due to increased protein in the vessel wall (H). This causes increased rigidity, which limits the capacity for expansion and constriction of the vessel and also reduces the luminal size and blood flow through the vessel. Increased luminal pressure in arterioles pushes plasma proteins into the vessel wall. Definition: Dilation of a vessel wall due to increased wall stress; "vessel weakening plus outpouching" (Link 10-16) 1.
Medial fibres of the right crus embrace the oesophagus where it passes through the diaphragm asthma you suck at breathing discount advair diskus 500 mcg with visa, the more superficial fibres ascend on the left asthma symptoms cdc buy discount advair diskus 250 mcg, and deeper fibres cover the right margin asthma treatment with antibiotics purchase advair diskus online pills. In 30% population a superficial muscular bundle from the left crus contributes to the formation of the right margin of the hiatus. Arcuate ligaments Median arcuate ligament is an arched fibrous band connecting the upper ends of two crura. Medial arcuate ligament (Medial Lumbocostal Arch) is the thickened upper margin of the psoas sheath. It extends from the side of the body of L2 vertebra to the tip of the transverse process of L1 vertebra. Lateral arcuate ligament (Lateral Lumbocostal Arch) is the thickened upper margin of fascia covering the anterior surface of the quadratus lumborum. Minor Openings: Costo-xiphoid gap (space of Larry) is present between the muscular slips arising from xiphoid process and 7th costal cartilage. Musculophrenic artery passes through the gap between the slips of origin from 7th to 8th ribs. Sympathetic chain passes deep to the medial arcuate ligament, subcostal nerves and vessels pass deep to the lateral arcuate ligament. Greater, lesser, and least splanchnic nerves pass by piercing the crus of diaphragm to enter the abdomen. Azygous vein pierces right crus of diaphragm to enter thorax, hemiazygos vein pierces the left crus. Clinical Correlation Hernia Sliding hernias (90% cases) are typically acquired, found in more than 50% of patients with gastro-oesophageal reflux. There is no reflux of gastric contents but strangulation or obstruction may occur. Phrenic nerve lesion may result in paralysis and paradoxical movement of the diaphragm. The paralyzed dome of the diaphragm does not descend during inspiration and is consequently forced upward due to increased abdominal pressure. Right phrenic nerve branch Central tendon of diaphragm has an opening for the passage of inferior venae cava (at T- 8 vertebrae level), along with that passes few branches of right phrenic nerve. Aorta passes through an intercrural gap posterior to the diaphragm (T-12 vertebra level). Right side pushed up by liver Left side of diaphragm is lower, since it is pushed down by heart, whereas right side of diaphragm is higher, since pushed up by liver (Subject experts in different fields have contradictory views, and the topic remains controversial). Muscular part of diaphragm Oesophagus passes through muscular part of the diaphragm, surrounded by fibres of right crus and few fibres from left crus occasionally. Azygos vein and thoracic duct the aortic hiatus transmits the aorta, thoracic duct, lymphatic trunks from the lower posterior thoracic wall and, sometimes, the azygos and hemiazygos veins. Azygos vein Aorta and thoracic duct pass through the aortic hiatus, which lies posterior to the diaphragm. Azygous vein may pass through this opening sometimes, usually it pierces through the crus of diaphragm to enter the thorax. Greater splanchnic nerve usually pierce through the crus of diaphragm to enter the thorax. Left phrenic nerve Oesophageal hiatus is an opening in the diaphragm, through which along with oesophagus, few other structures also pass, that is right and the left vagal trunk and a branch of left gastric artery. The respiratory portion includes the respiratory bronchioles, alveolar ducts, atria, and alveolar sacs.
