(n.) The marrow of bones; the deep or inner portion of an organ or part; as, the medulla, or medullary substance, of the kidney; specifically, the medula oblongata.
(n.) A soft tissue, occupying the center of the stem or branch of a plant; pith.
Example Sentences:
(1) Furthermore, the local interneurons make extensive efferent synaptic connections with unidentified neurons in the terminal medulla.
(2) These findings suggest that AAT participates in the synthesis of transmitter aspartate in the medulla oblongata of the rat.
(3) These included the noradrenergic, TH- and DBH-immunoreactive cell groups of the pons and medulla.
(4) Size of both areas gradually decreased as the medulla filled with plasma cells, 7-30 days after injection.
(5) Obvious restitution of the thymic medulla was evident about 14 days after withdrawal of FK506.
(6) + inf., pons + medulla), rCBF increased toward the control level gradually, and it completely recovered 60 min after recirculation.
(7) It is well established that the renal medulla exerts a potent endocrine-like antihypertensive action.
(8) It was found that within the dorsal part of the well known pressor area there is a narrow strip, 2.5 mm lateral from the mid line, starting ventral to the inferior colliculus and ending in the medulla close to the floor of the IV ventricle, from which vasodilatation in skeletal muscles is selectively obtained.
(9) Urea decreased and valine increased in the TD medulla-pons.
(10) The sizes of adrenaline (A) and noradrenaline (N) cells in the adrenal medulla of nonoperated (NO), sham-operated (SPX), and pinealectomized (PX) male rats (n = 126) were investigated by quantitative light microscopy.
(11) Injection of horseradish peroxidase into the rostral ventrolateral medulla (RVLM) led to heavy retrograde and anterograde labeling in the region of the hypothalamus that yielded the CRDR when stimulated electrically.
(12) The object of these studies was to investigate whether destruction of the renal medulla in normal rats would alter vascular capacitance.
(13) The presence in lamprey kidney of a loop which is similar to Henle's loop in mammals and birds indicates that the development of the system of osmotic concentration conditioned by the formation in the kidney of the medulla and from a sharp increase in renal arterial blood supply.
(14) Our results suggest that multiple receptors and signal transduction pathways are involved in the regulation of the tyrosine hydroxylase gene in the rat adrenal medulla.
(15) In hypertensive rats (SHR) the density of alpha 2-adrenoceptors was reduced in the cerebral cortex, hypothalamus and medulla oblongata (20-27%), as was the dose-pupillary response curve for clonidine (1.8-fold).
(16) An antihypertensive function in systemic blood pressure control has been attributed to the renal medulla.
(17) 1 After the injection of labelled procaine and lidocaine in mice, the location and concentration of radioactivity was demonstrated by autoradiographical methods.2 An accumulation in some endocrine cells such as the pancreatic islets, the hypophysis, the adrenal medulla and certain cells of the thyroid (probably representing the calcitonin-producing parafollicular cells) was shown.3 After the injection of [(14)C]-procaine in chicks, an accumulation of radioactivity was observed in the ultimobranchial gland (which produces calcitonin in birds), but not in the thyroid.4 Radioactivity was also shown to be strongly concentrated in structures containing melanin, such as the pigment of the eye, skin and hair and in some organs involved in the metabolism and excretion of these drugs.
(18) Histologically, increased amounts of fibrotic tissue in the medulla and the cortex were found together with tubular atrophy.
(19) Two well-defined zones are observed both in the medulla and in the cortex.
(20) One infant had a unilateral infarction in the medulla and another showed extensive gliosis in the brainstem tegmentum along with a large infarction in the region of the anterior cerebral artery.
Medullated
Definition:
(a.) Furnished with a medulla or marrow, or with a medullary sheath; as, a medullated nerve fiber.
Example Sentences:
(1) Thus these data indicate that although the aortic C-fibres are reset in chronic hypertension, they are reset less than the medullated aortic baroreceptors from the same animal.
(2) Four patients had Gorlin's (or basal cell nevi) syndrome and pronounced medullated nerve fibers.
(3) In 9-week-old undernourished rats, the number and caliber of myelinated fibers were normal while the cross-sectional area of non-medullated fibers was 29% smaller than controls.
(4) The threshold for activation of 54 medullated aortic baroreceptors in the same animals was from 70 to 140 (mean 109) mmHg.
(5) After 6 months the histological examination revealed the presence of newly germinated medullated nerve fibers and motor end plates.
(6) In cross sections of the phrenic nerve 1--2 cm above its entrance into the diaphragm, after an incubation period of 24 hours, 86% of the medullated nerve fibres displayed a high enzyme activity and therefore were classified as motoric.
(7) The mean activity at 100 mmHg was, for the C-fibres 5.0 Hz and for the medullated fibres 34 Hz.
(8) Adrenal medullitis was observed in 20% of IDDM subjects, suggesting that the adrenal medulla may be another immunological target in IDDM.
(9) Compared with the medium-energy-diet, the high-energy diet reduced hair weight per unit of surface area, undercoat number and guard hair medullation.
(10) The patient had the typical marfanoid habitus, with thickened lips and alae nasi, neuromas on lips and tongue, medullary carcinoma of the thyroid gland, phaeochromocytomas, and medullated corneal nerve fibres.
(11) The major limitation is a time- and frequency-dependent block of nonmedullated fibers which makes the technique suitable only for differentiating between medullated fibers and nonmedullated fibers with low frequency traffic.
(12) That this inhibition is due to nonmedullated vagal afferents (C fibers) was demonstrated by selective cooling of the vagi, anodal block of medullated afferents, and selective electrical stimulation of medullated and nonmedullated fibers.
(13) No atrial medullated receptors or ventricular C-fibre endings were found.
(14) mmHg (P less than 0.05) in three non-medullated fibres.
(15) Many non-medullated fibres were observed in the villi, especially beneath the epithelial layer.
(16) This case of Schwann cell proliferations appearing as medullated retinal nerve fibers raises questions concerning the relationship of this phenomenon to developmental and acquired lesions of the optic nerve head in man.
(17) In experiments on the isolated aortic arch preparation the electrophysiological characteristics of the aortic baroceptors with the medullated and non-medullated fibres were studied by means of a selective block of conduction in these fibers.
(18) Repetitive stimulation of a single medullated nerve fiber of Xenopus yields a succession of postspike voltage-time curves which are nearly coincident until attainment of a voltage that corresponds to that of the maximum attained by the normal postspike undershoot.
(19) Baroceptors with the non-medullated fibers had a higher threshold pressure and a wider functional range.
(20) The histological studies using electronic microscope showed many non-medullated endings, which were often found beneath the epithelium and in the lamina propria of the villi close to the blood vessels.