共查询到18条相似文献,搜索用时 62 毫秒
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为探讨家兔、大鼠胫骨前肌在生后各日龄阶段前、后亚体内快慢肌纤维的发育情况,应用大体解剖结合组织化学法明确其肌亚体,并作琥珀酸脱氢酶(SDH)染色,图象分析两型肌纤维的直径特征。用电生理记录仪,分别测量肌前、后亚体功能。结果表明:家兔与大鼠各肌亚体划分在生后发育中逐渐分界清楚,生后2、3天均未能分出Ⅰ、Ⅱ型肌纤维,也未见有原始肌束。Ⅰ、Ⅱ型肌纤维比例随年龄增长而变化,Ⅱ型纤维比例增大。Ⅱ型纤维直径均大于Ⅰ型纤维,葡萄状运动神经末梢支配慢肌纤维,斑点状运动终板位于快肌纤维,前后肌亚体诱发电位表明其特殊的功能。 相似文献
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对非纯种的Wistar品系大鼠自上海引入高原后的子一代进行模拟高原低氧(海拔高原5000m)对其生后发育影响的研究。结果表明:在低氧环境下,大鼠的心脏、肝脏、脾脏和肾脏均出现不同程度的细胞变性,脾脏在生后31d时,成血细胞减少。 相似文献
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测定了豁鹅、狮头鹅与莲花白鹅肌肉纤维直径与密度,并对其与肉质嫩度关系进行了研究。结果表明:豁鹅的肌纤维较细而密度较高,狮头鹅的较粗而密度较小,莲花白鹅介于两者之间,这些都与其肉质细嫩度有一定关系。 相似文献
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通过组织学、组织化学和超薄切片的方法对生后不同日龄新西兰白兔的骨骼肌发育特,点进行了系统研究。研究表明,初生兔在组织学结构和SDH酶的分布等方面尚未发育完善,需在生后一周左右才发育成熟,骨骼肌纤维才可区分为:红肌纤维、白肌纤维和中间型肌纤维三种类型。三种肌纤维类型所占比例随着兔的生长发育而发生变化。骨骼肌的迅速生长期主要在初生至6周龄。6周龄时,肌纤维的直径、肌原纤维直径及每根肌原纤维所含的微肌丝数分别比初生时增加了70%、188%和179%,但肌桨部分的比例(即不含肌纤维的胞桨部分)下降53.46%,其中肌原纤维中的微肌丝数量的迅速增加是导致肌纤维直径迅速增长及胞桨比例下降的主要原因。因此,在初生16周龄期间提供足够的蛋白质营养,无论对肌纤维的酶分化,还是对其生长发育都十分重要。新西兰白兔的骨骼肌纤维由肌节为单位组成,肌节的基本结构在胚胎期就已决定,不随兔日龄的增长而变化,而与科属特性有关。随着兔的生长发育,骨骼肌纤维的糖原、线粒体、脂滴和肌桨网终池等呈现出规律性变化。12周龄兔的肌纤维直径较细,细胞中含有中等量的线粒体、糖原及肌桨网终池,并且肌原纤维间分布有适量的细小脂滴等 相似文献
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本文旨在比较3个不同栽培品种生大豆中抗营养因子对大鼠生长性能、内脏器官形态、血液生理、生化指标和肠道组织学的影响.试验选取30只(50±2)日龄的wister大鼠为试验动物,采用单因子完全随机化设计,共分3组,每组10只大鼠,每个重复1只.各组分别饲喂以吉林小粒6、吉林45和丰交7607品种生大豆为主要蛋白源的日粮,试验期30 d.检测3个栽培品种生大豆中胰蛋白酶抑制因子(PI)和凝集素(SBA)的含量.结果表明:吉林小粒6、丰交7607的PI含量显著高于吉林45品种(P<0.05),吉林小粒6的SBA含量显著高于丰交7607和吉林45品种(P<0.01).吉林小粒6日粮组大鼠的胰腺重量、空肠隐窝深度(JCD)分别比吉林45日粮组大鼠高22.6%、39.4%(P<0.05);吉林45日粮组大鼠空肠绒毛高度(JVH)比吉林小粒6、丰交7607日粮组大鼠日粮组高8.8%、8.4%(P<0.05).由结果可知,各品种生大豆日粮对大鼠抗营养的作用为吉林小粒6>丰交7607>吉林45. 相似文献
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采用PCNA免疫组化法和TUNEL染色法,并结合光、电镜技术研究天府肉鸭胚胎及胚后发育期腔上囊淋巴细胞增殖与凋亡的动态变化规律。结果显示胚胎期腔上囊淋巴细胞增殖明显,其滤泡淋巴细胞增殖指数(PIF)随胚龄增加而逐渐增高,26d胚龄达峰值。胚后期各组滤泡皮质淋巴细胞增殖指数(PIC)和髓质淋巴细胞增殖指数(PIM)均呈下降趋势;各组PIM均明显高于PIC。胚胎期腔上囊滤泡淋巴细胞凋亡指数(AIF)随胚龄增大而逐渐增高。胚后期O~3周龄滤泡髓质淋巴细胞凋亡指数(AIM)继续增高,滤泡皮质淋巴细胞凋亡指数(AIC)则无明显变化;AIC和AIM在5周龄下降,17周龄明显升高,29周龄达峰值。胚后0~14周龄,各组AIM均明显高、于AIC,而17~29周龄AIM则明显低于AIC。凋亡淋巴细胞核呈现多种形态,线粒体肿胀,嵴断裂。结果提示淋巴细胞增殖与凋亡在鸭腔上囊胚胎及胚后发育的整个过程中普遍存在,具有明显增龄变化特性,二者协同参与腔上囊发育和退化过程。 相似文献
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神经肌亚体内肌纤维型的生后发育 总被引:3,自引:0,他引:3
将生后2天、2周、4周、8周、12周、16周、20周、24周的家兔胫骨前肌分成前、后亚体,分别得到腓得神经主要肌分支的支配,腓深神经分支的神经分布型式随年龄增长而递降.每个肌亚体组织化学特征经由乙酰胆碱碘溶液孵育后的运动终板而确定.肌纤维可分成SO、FG、FOG和FO型.除外生后2天龄之外,前、后亚体内SO、FG、FOG肌纤维在生后2周龄、4周龄、8周龄分别约占30%左右,生后12周龄以后,在前亚体内的SO型与FOG型纤维比率下降和FG型纤维升高要超过后亚体.全部肌纤维型在生后2周龄、4周龄、8周龄、12周龄的每个肌亚体的深、中、浅部都是均匀性分布.然而,不同部位的肌纤维类型差别明显,深部以氧化型为主,而浅部则以糖酵解型为主.这种差别在生后16、20、24周龄是最典型的.两个亚体生后发育期间的每条肌纤维毛细血管数(NCF)表明SO>FO>FOG>FG型纤维和毛细血管数与肌纤维横切面积比(CCA)显示FO>SO>FOG>FG型纤维,由此指出氧供较大需求的获得是通过减小肌纤维的面积而不仅仅是依赖于增加毛细血管数量. 相似文献
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K.-H. Wrobel 《Reproduction in domestic animals》1990,25(2):51-60
Contents: The postnatal development of the bovine Leydig cell population from week 4 to young adulthood (75–100 weeks) was examined with morphometric techniques using perfusion-fixed samples and histological, semithin and ultrathin sections. Leydig cell mass per testis increases from 0.15 g to 3.62g between weeks 4 and 16, from 3.64 g to 5.93 g between weeks 20 and 30 and from 7.28 g to 10.47 g between 1 year and 1 1/2 to 2 years. Relative Leydig cell volume per unit is largest in week 16 (17.1 %). Calculated number of Leydig cells per testis amounts to 0.42 ± 109 in week 4 and 6.02 ± 109 in the adult group. Leydig cell nuclear diameter in week 4 (5.6 ± 0.3 pm) is significantly smaller and in week 75–100 (7.4 ± 0.4 μm) significantly larger than in weeks 8 through 52. Irrespective of varying Leydig cell size, the relative content of eR (about 48%) and mitochondria (about 8%) fluctuates in narrow limits during the entire period. The individual Leydig cell of week 4 has less than 20%, of week 8 about 30%, of weeks 16 through 52 about 50% of the volume of a Leydig cell of young adult (75–100 weeks) animals . 相似文献
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Masamichi Kurohmaru Toshiyasu Matsui Hitomi Igarashi Shosaku Hattori Yoshihiro Hayashi 《Anatomia, histologia, embryologia》2021,50(2):417-421
The postnatal testicular development and actin distribution in the seminiferous epithelium were examined by light microscopy, using the testes of the Habu (Trimeresurus flavoviridis; snake) from 0-year-old to 3-year-old. At 0-year-old (about 1 month after birth), the testis was quite small in size, and the seminiferous epithelium was composed of only Sertoli cells and large spermatogonia. Actin immunoreactivity was observed in the peritubular myoid cells, but could not be detected in the seminiferous epithelium. At 1-year-old (about 10 months after birth), the testicular size increased to a great degree. In the seminiferous epithelium, spermatocytes newly appeared. Actin could still not be detected in the seminiferous epithelium. At 2-year-old (about 1 year and 10 months after birth), the testes continued to develop in size. In the seminiferous epithelium, elongate spermatids and round spermatids were frequently seen, in addition to Sertoli cells, spermatogonia and spermatocytes. Thus, active spermatogenesis was clearly recognized at this age. Moreover, the actin distribution in the seminiferous epithelium was observed at the site between Sertoli cells and spermatids, as well as that at adult stage. The immunoreactivity of actin in the peritubular myoid cells gradually increased from 0-year-old to 2-year-old. Conclusively, it seems likely that spermatogenesis in the Habu initiates at 2-year-old, accompanying with the appearance of actin in the seminiferous epithelium. 相似文献
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肌肉组织分为骨骼肌、心肌和平滑肌3种类型。其中骨骼肌是畜禽最大的器官,约占畜禽身体质量的40%,它由大小、形状及肌肉收缩蛋白含量不同的肌纤维构成,对维持身体姿势、呼吸和体温调节是必不可少的。在肌纤维发育的各阶段,复杂的外在和内在机制共同调控着肌肉的发生,相关的信号机制在这当中起着决定性作用。畜禽的骨骼肌是主要的肉产品来源,而肉质性状的改善也是每个畜禽场的重要目标,因此对肌纤维的发生及相关机制的全面了解是很有必要的。本文通过整合1987—2022年国内外肌纤维研究相关文献,对肌纤维的发生、类型及调控机制进行了综述,重点介绍了与畜禽肌纤维发育规律相关的基因及信号通路,并对目前畜禽肌纤维调控机制研究存在的问题提出了建议和未来研究的方向进行了展望。 相似文献
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Seunghoon LEE Yunkyung HONG Sookyoung PARK Sang-Rae LEE Kyu-Tae CHANG Yonggeun HONG 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2014,76(12):1555-1561
Rodent models of focal cerebral ischemia that do not require craniotomy have been
developed by intraluminal suture middle cerebral artery occlusion (MCAo). Mouse MCAo
models have been widely used and extended to genetic studies of cell death or recovery
mechanisms. Therefore, we compared surgery-related parameters and techniques between such
rats and mice. In rodent MCAo models, has to be considered body temperature during the
operative period, as well as the need for the use of a standardized tip in terms of the
outer diameter of probes. Induction of focal cerebral ischemia was measured by
neurological dysfunction parameters. Our methods could induce stable moderate-severity
ischemic brain injury models and histological alteration at 24 hr after MCAo surgery.
Moreover approximately 80% (rats) and 85% (mice) survival ratios were shown indicating
with model engineering success. Finally, we described and compared major parameters
between rats and mice, including probe size, thread insert length, operation and occlusion
periods, and differences in the procedures. 相似文献
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对18只法比兔生后舌和食管进行组织学观察的结果表明,免出生时舌背侧粘膜上皮未角化,并含有大量丝状乳头(平均高为135.7μm)和少量菌状乳头。固有膜不发达。舌肌为纵向、横向及垂直方向排列的横纹肌。舌腹侧粘膜表面平滑。15日龄以后,舌背侧菌状乳头高为200~521μm,其顶部直径为93~221μm。1日龄时,兔食管粘膜上皮只有4~5层细胞(平均厚28.5μm)。60日龄时,已达30层左右(平均厚164.3μm)。固有膜与粘膜下层分界不清。肌层由内纵、中环、外纵3层组成。肌层随年龄增长而逐渐增厚,1日龄时平均厚度121.4μm,60日龄时平均厚度达750μm。 相似文献
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本研究旨在探明水牛唾液生殖激素、唾液结晶和卵泡发育变化的规律。应用ELISA试剂盒测定水牛唾液和血清中的生殖激素,制作唾液结晶,并分析生殖激素和唾液结晶与卵泡变化的关系。运用唾液结晶法、直肠检查法、唾液结晶+B超法、直肠检查+B超法4种方法在生产中进行验证。结果表明,水牛发情当天唾液雌激素(E2)的水平为233.51 pg/mL,达到一个峰值,随后开始缓慢降低。水牛唾液中孕激素(P4)水平在发情前2 d达到16.17 ng/mL,发情当天降到8.91 ng/mL。促卵泡素(FSH)在水牛发情前2 d逐渐下降,从37.91 ng/mL降到34.64 ng/mL,但在发情2 d后逐渐升高,达到61.20 ng/mL。促黄体素(LH)在发情前1 d逐渐下降,从5.15 ng/mL降至发情当天4.12 ng/mL,但在发情1 d后升至5.77 ng/mL。B超监测卵巢卵泡从发情前2 d迅速生长,到发情当天达到20 mm大小,直到破裂排卵卵泡的大小变化不显著。排卵后形成黄体,黄体期一直维持到下次发情前4 d左右,期间在发情后14~17 d的黄体最大,与水牛唾液中LH分泌峰一致。唾液结晶+B超鉴定方法判定的发情率最高(86.67%),与其他几种方法比较差异显著(P<0.05);妊娠诊断结果也表明,唾液结晶+B超鉴定方法判定的妊娠率(61.53%)显著高于直肠检查法、唾液结晶法和直肠检查+B超法3种方法鉴定的结果(P<0.05)。综上所述,卵巢上卵泡的发育与唾液中生殖激素的浓度显著相关,发情当天唾液结晶呈现典型的树枝状,唾液结晶+B超法的发情鉴定准确率最高。 相似文献