| 单词 | Haversian canal |
| 例句 | At the hub of each osteon is an opening called the Haversian canal filled with blood and lymph vessels and nerves. Fundamentals of Biology 2015-01-01T00:00:00Z A blood vessel and a nerve are found in the center of the structure within the Haversian canal, with radiating circles of lacunae around it known as lamellae. Biology for AP Courses 2022-06-09T00:00:00Z Running down the center of each osteon is the central canal, or Haversian canal, which contains blood vessels, nerves, and lymphatic vessels. Anatomy and Physiology 2013-06-19T00:00:00Z They pass out from the Haversian canals at right angles, going to all portions of the compact substance except a thin layer at the surface. Physiology and Hygiene for Secondary Schools His experimental observations appear to show that new bone is exclusively formed by the cellular elements or osteoblasts: these are found on the surface of the bone, lining the Haversian canals and in the marrow. Manual of Surgery Volume First: General Surgery. Sixth Edition. The lamellae surrounding the Haversian canal resemble tree rings. Fundamentals of Biology 2015-01-01T00:00:00Z Each osteon consists of lamellae, which are layers of compact matrix that surround a central canal called the Haversian canal. Biology for AP Courses 2022-06-09T00:00:00Z This enlargement of the Haversian canals is well seen when the bone is macerated, the whole then giving the appearance of a piece of very rough pumice-stone. Diseases of the Horse's Foot The Bone Cells.—Surrounding the Haversian canals are thin layers of bone substance called the laminæ, and within these are great numbers of irregular bodies, known as the lacunæ. Physiology and Hygiene for Secondary Schools It is worst at night, preventing sleep, and has been ascribed to compression of the nerves in the narrowed Haversian canals. Manual of Surgery Volume First: General Surgery. Sixth Edition. Microchannels called canaliculi radiate through the rings out from the central Haversian canal, connecting the lacunae together. Fundamentals of Biology 2015-01-01T00:00:00Z Blood vessels, nerves, and lymphatic vessels are found in the central Haversian canal. Biology for AP Courses 2022-06-09T00:00:00Z In this case there is a formation of new bone in the connective tissue surrounding the vessels in the Haversian canals. Diseases of the Horse's Foot The cells within the interior of the bone receive their nourishment from the small blood vessels in the Haversian canals. Physiology and Hygiene for Secondary Schools The diaphysis is also nourished by numerous blood vessels from the periosteum, which penetrate the cortex through the Haversian canals and anastomose with those derived from the nutrient artery. Manual of Surgery Volume First: General Surgery. Sixth Edition. In fact, it is true bone, but lacks the Haversian canals. A Practical Physiology The lacunæ are arranged in circles around larger tubes, termed from their discoverer, Haversian canals, which serve as passages for the blood vessels that nourish the bone. Hygienic Physiology : with Special Reference to the Use of Alcoholic Drinks and Narcotics As a consequence the bone affected is greatly increased in density, and many of the Haversian canals by this means obliterated. Diseases of the Horse's Foot Lymph from these vessels is conveyed to the cells through the canaliculi that connect with the Haversian canals. Physiology and Hygiene for Secondary Schools It consists of two layers, an outer fibrous and an inner cellular layer; the cells, which are called osteoblasts, are continuous with those lining the Haversian canals and the medullary cavity. Manual of Surgery Volume First: General Surgery. Sixth Edition. These openings are sections of canals called Haversian canals, after Havers, an English physician, who first discovered them. A Practical Physiology The new bone is laid down on the surface, in the Haversian canals, or in the cancellous spaces and medullary canal, or in all three situations. Manual of Surgery Volume First: General Surgery. Sixth Edition. A piece of bone undergoing rarefactive ostitis is redder than normal, and the openings of the Haversian canals are distinctly increased in size. Diseases of the Horse's Foot In addition to this the articular surfaces are quite smooth and dense, having no Haversian canals, and they are covered with a layer of cartilage. Physiology and Hygiene for Secondary Schools The process may remain localised to the ossifying junction, but usually spreads along the medullary canal for a varying distance, and also extends to the periosteum by way of the enlarged Haversian canals. Manual of Surgery Volume First: General Surgery. Sixth Edition. The black bodies are minute cavities called lacunæ, while the fine lines are very minute canals, canaliculi, which connect the lacunæ and the Haversian canals. A Practical Physiology These Haversian canals are supplied with tiny blood-vessels, while the lacunæ contain bone cells. A Practical Physiology |
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