What's the difference between metencephalon and pons?
Metencephalon
Definition:
(n.) The posterior part of the brain, including the medulla; the afterbrain. Sometimes abbreviated to meten.
Example Sentences:
(1) The metencephalon differentiated as a cerebellum in the telencephalon.
(2) Proenkephalin-containing perikarya were located in all major subdivisions of the brain except the metencephalon.
(3) Using an anti-tyrosine hydroxylase antiserum, the whole of catecholaminergic perikarya of the myelencephalon and metencephalon of the sheep were visualized immunocytochemically.
(4) The first histamine-immunoreactive neurons were seen on embryonic day 13 in the border of mesencephalon and metencephalon.
(5) The midbrain itself is required for normal development of the metencephalon.
(6) Brainstems of 14-15 days old rat embryos were removed and the area located between the mesencephalic flexure and the caudal portion of metencephalon was dissected and mechanically dissociated to single cells.
(7) In mammals, cells in the superior rhombic lip and dorsal part of the dorsal lamina of the metencephalon are said to proliferate to form two rounded swellings, the rudiments of the cerebellum.
(8) Rostral mesencephalon and rostral metencephalon have been more easily influenced by environmental factors than their caudal counterparts, suggesting that regions providing instructive positional factors exist within the 2-day-old germinative neuroepithelium.
(9) These results demonstrate that at least some regions of the germinative neuroepithelium from either metencephalon, mesencephalon, and diencephalon are still pluripotent in the 2-day-old avian embryo and that their fate seems to be under the influence of the surrounding structures.
(10) E9.5 brain fragments containing metencephalon and mesencephalon were isolated, explanted on Nucleopore filters and cultured in the absence or presence of antibodies to E-cadherin.
(11) We found that E-cadherin (uvomorulin) is transiently expressed in restricted regions of the metencephalon, mesencephalon and diencephalon of mouse embryonic brain.
(12) The matrix cells in the di-, mes- and metencephalon appeared less or not at all affected by maternal hypoxia.
(13) In some mammals, mast cells were also numerous in the stroma of the telencephalic choroid plexuses (chimpanzee, squirrel monkey), the putamen and the claustrum (chimpanzee), the subfornical organ (pack rat, tiger, chimpanzee), the olfactory peduncles (hooded rat, albino rat), the stroma of the diencephalic choroid plexus (lion, chimpanzee, squirrel monkey), the pineal organ (chimpanzee, squirrel monkey), some nuclei of the hypothalamus (tiger), the infundibulum (hooded rat, tiger, fox) the area postrema (pack rat, chinchilla, lion, spider monkey, chimpanzee, fox) and some nuclei and tracts of the metencephalon and the myelencephalon (tiger).
(14) In both genera, there were numerous 5-HT+ and LENK+ fusiform cells paralleling the ventral surface of the metencephalon and myelencephalon.
(15) High concentrations of total radioactivity were observed by autoradiography in the midbrain and hindbrain (mesencephalon, metencephalon, and myelencephalon) and spinal cord, but not in the forebrain.
(16) Control embryos containing intact notochords expressed Engrailed-2 protein within the neural tube and in a subset of the neural crest and overlying surface ectoderm at the future mesencephalon and cranial metencephalon levels.
(17) At this stage, in the central nervous system, mesencephalic trigeminal neurons are also E1.9 and B30 positive as they migrate to their final location in the rostral metencephalon.
(18) The prosencephalon did not differentiate into the cerebellum when transplanted into the metencephalon, although previous study showed that the prosencephalon has the capacity to differentiate into the optic tectum.
(19) These results suggest that centres above the metencephalon do not exert any tonic effects on the cell bodies of the olivocochlear pathways that result in tonic effects at the cochlea.
(20) In addition, putative A1, A2, A5, A7 (noradrenergic) groups were found in the metencephalon and myelencephalon.
Pons
Definition:
(n.) A bridge; -- applied to several parts which connect others, but especially to the pons Varolii, a prominent band of nervous tissue situated on the ventral side of the medulla oblongata and connected at each side with the hemispheres of the cerebellum; the mesocephalon. See Brain.
Example Sentences:
(1) The pons, on the other hand, has a bioelectrical activity of its own during PS, i.e., the ponto-geniculo-occipital spikes (PGO).
(2) These included the noradrenergic, TH- and DBH-immunoreactive cell groups of the pons and medulla.
(3) + inf., pons + medulla), rCBF increased toward the control level gradually, and it completely recovered 60 min after recirculation.
(4) Injection of the tracer substance wheat germ agglutinin-horseradish peroxidase (WGA-HRP) directly into the basilar pontine nuclei using a ventral surgical approach resulted in the labeling of somata in many areas both rostral and caudal to the basilar pons.
(5) Urea decreased and valine increased in the TD medulla-pons.
(6) Recently, direct pathways from the dorsolateral pons to the ON, probably involved in supraspinal micturition control, have been reported (Holstege et al., 1986).
(7) In the pons, PRV labeled neurons were found bilaterally in the locus ceruleus, subceruleus region, and parabrachial complex.
(8) P3.1 and P3.8 were identified only as farfield potentials in intracranial recordings from the pons and more rostral regions.
(9) Computed tomography showed a lesion in the pons, and seven months later he was found to have metastatic adenocarcinoma.
(10) Weaker linkage between the CF locus and the locus for the serum enzyme activity marker paraoxonase (PON) was detected, theta = 0.18, zeta = 0.76.
(11) In the medulla and pons the ir appeared as from E12.
(12) Pons-Tortella et al reported the sparing of this nucleus in acute anterior poliomyelitis.
(13) Effects of noxious electrical tooth stimulations and intraarterial administration of bradykinin or inhalation of volatile anesthetics on substance P content in the diencephalon-mesencephalon, pons-medulla and the spinal cord were examined in the rat.
(14) Synchronization of phasic bursts was consistently observed between simultaneously recorded structures and this, along with the time course of early increments in SW was consistent with the notion that mesencephalic reticular activity is controlled by leading influences from the pons.
(15) Specifically, a decrease in the central conduction times was noted for the I-III interpeak interval, suggesting neurophysiologic dysfunction in the area of the pons and cerebellum.
(16) Among them, two patients had deformities of the pons.
(17) This study examines the effects of styrene oxide, a reactive metabolite of the neurotoxic solvent styrene, on GSH metabolism in six regions of the rat brain (cortex, cerebellum, medulla-pons, hippocampus, striatum and hypothalamus).
(18) The course of the fiber pathways to pons from parasensory association areas in the rhesus monkey was investigated by injection of tritiated amino acids and the technique of autoradiography.
(19) 1 The ability of chlorpromazine to antagonize the effects of iontophoretic application of (+)-amphetamine to single neurones in the medulla and lower pons of anaesthetized rats has been studied.
(20) Noradrenaline concentration was elevated in the brain stem, particularly in the pons, and decreased in the cerebral cortex and the spinal cord while in the cerebellum, the effects were dependent on the mode of administration.