What's the difference between endosteum and periosteum?
Endosteum
Definition:
(n.) The layer of vascular connective tissue lining the medullary cavities of bone.
Example Sentences:
(1) It is concluded that the tissue in diffusion chambers, formed by a small number of early precursor cells present in the soft tissues of the endosteum and marrow of young rabbits, contains extracellular matrix macromolecules similar to those found in bone and cartilage.
(2) With bead types II and III, bead-associated new bone was seen at 3 days and 4 days only when beads lodged near the endosteum or in the metaphysis.
(3) However, the increase in rate of influx when the cellular layers are removed indicates that the periosteum and endosteum constitute an important structural conponent in the maintenance of bone mineral and its equilibration with the circulation.
(4) Immunohistochemistry of normal and neoplastic tissues demonstrated that RCB1 bound the connective tissues surrounding the cancer nests and various normal tissues including interstitium of renal distal tubule, periosteum, endosteum, smooth muscles of digestive tract and media of arteries and arterioles.
(5) Our studies of 2 microns sectioned undecalcified plastic-embedded bone marrow (BM) from healthy human fetuses; normal adults; patients with acute myeloblastic leukemia (AML), acute lymphoblastic leukemia (ALL), and chronic granulocytic leukemia (CGL) in various stages (chronic, accelerated, acute blastic phase, and after autografting); and patients recovering from therapy-induced marrow hypoplasia suggest that proliferative hematopoietic zones exist near the endosteum (endosteal marrow) and the vascular endothelium (capillary and sinus-lining endothelium) and a maturational zone distal to these regions.
(6) Surgical interference within the blood supply to the inner ear was responsible for metaplastic bone, and damage to the endosteum by surgery or disease caused osteoplastic bone.
(7) Endosteum is the main source of the regeneration of the stromal elements.
(8) General and some special histologic methods have been used to study the structure of periosteum and endosteum, as well as the morphological peculiarities of their cells in rodents and hares in the early and late postnatal ontogenesis.
(9) The findings show the existence of antibodies directed against the cell nuclei, or against the endothelium of the cochlear vessels, or against the endosteum of the inner ear.
(10) Within the diaphyseal cortex, the primary resorption phase of Paget's disease is often limited either to the endosteum or to the central layers of the cortex.
(11) Ultrastructural peculiarities of stromal elements from bone marrow and endosteum in 28 children with acute leukaemia during clinical and hematological exacerbations are presented.
(12) The fluoride distribution of the femur bone in each specimen was analysed from the periosteum to the endosteum by using the abrasive micro-sampling technique described by Weatherell et al.
(13) These reticulum cells may be found throughout the marrow but are concentrated near the endosteum.
(14) One specimen displayed a circumscribed sensorineural degeneration in the upper basal turn, with an almost exact correspondence between the location and extent of the cochlear lesion and the site of invasion by the otosclerotic process in the bone and endosteum bordering on scala media and scala tympani.
(15) Irregular medullary bone formation may be connected with the endosteum, but usually it develops in the bone marrow, independently of the endosteum.
(16) The site of origin in 5 rats was found to be in or near the endosteum.
(17) Where otosclerosis involved the endosteum of the scala tympani, loss of vessels was observed.
(18) periosteum, endosteum, osteocytes, marrow) removed by mechanical or enzymatic pretreatment.
(19) In the cement treated animals external callus formation occurred slowly, due to poor bone-forming capacity of the endosteum and a failure to form a bridge at the fracture site.
(20) Our working hypothesis is that BMP induces the differentiation of perivascular connective tissue cells into chondroblasts and osteoprogenitor cells and thereby augments the process of bone regeneration from the cells already present in the endosteum and periosteum.
Periosteum
Definition:
(n.) The membrane of fibrous connective tissue which closely invests all bones except at the articular surfaces.
Example Sentences:
(1) The control periosteum contained a rich network of substance P immunofluorescent nerves.
(2) This flap is formed by a triangle-shaped excision combined with cranial and caudal slitting of the periosteum.
(3) In the periosteum of the human tibia, the arterial blood supply shows a general sectorial angioarchitecture.
(4) It is the manner in which the soft tissues and, in particular, the periosteum are handled that ultimately affects the results of the surgical treatment.
(5) In the area where the collagen was disorganized, and also near the periosteum, woven bone was first formed, which was then remodeled into lamellar bone.
(6) Orthopedic new approaches to therapy of OA include removal of abnormal tissue to stimulate repair (e.g., burring, abrasion) and grafting (e.g., osteochondral grafts, perichondrium, periosteum) to the subchondral bone.
(7) Treated embryos showed a delay in the longitudinal growth of the tibia, as well as in the growth of all structures enclosed by the perichondrium-periosteum.
(8) It also shows that the periosteum has the leading role in the restructuring process of these grafts.
(9) Chick periosteum-derived cells, which do not enter the chondrogenic cell lineage during normal bone development and growth, exhibit chondrogenic potential in high cell density culture conditions.
(10) Thus it was found that isolated tibial and skull periosteum in situ give rise to tubular and membranous bone respectively, suggesting an environmental influence.
(11) Normal (N-) calf bone consists of lamellae regularly spaced and oriented parallel to the periosteum.
(12) Fracture repair proceeds by an osteogenic reaction from both periosteum and marrow.
(13) It appears that the periosteum slides over the bone cortex, mitigating local stretching of the muscle around osteotomy site.
(14) The fibers originated in the periosteum or in the fibrous stroma of the marrow cavity and were oriented with regard to both the spatial and the lamellar organization of the bone.
(15) The capsule of the cyst was connected with the dura mater and the orbital periosteum with adhesions.
(16) Whenever the tumor is close to the mandible or adherent to the periosteum, consideration should be given to marginal mandibulectomy.
(17) Calvarial periosteum, however, was found to be less bone producing and in that respect not to be superior to the dura.
(18) We have previously shown that osteoblasts and osteocytes contain adenylate cyclase responsive to both PTH and CT whereas the enzyme prepared from periosteum and marrow cells did not respond to either.
(19) The tarsal strips are sutured to periosteum at the lateral orbital wall, adjusting the height and tension of the lateral canthus.
(20) Presumably, the membrane has served as a scaffold for regenerating periosteum.