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肺泡间隔 - 版本历史
2026-04-18T12:27:20Z
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2026-01-27T23:42:42Z
<p>建立内容为“<div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff…”的新页面</p>
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<strong>肺泡间隔</strong>（Alveolar Septum），亦称<strong>肺泡壁</strong>，是相邻两个[[肺泡]]之间的薄层结缔组织隔膜。它是肺部进行气体交换的核心场所，其内部包含丰富的<strong>[[毛细血管网]]</strong>、弹力纤维、胶原纤维以及各种间质细胞（如成纤维细胞、巨噬细胞）。肺泡间隔的结构完整性构成了<strong>[[气血屏障]]</strong>（Blood-Air Barrier）的物理基础。在病理状态下，肺泡间隔的增厚（如<strong>[[特发性肺纤维化]]</strong>）会导致弥散功能障碍，而肺泡间隔的断裂和破坏（如<strong>[[肺气肿]]</strong>）则导致肺弹性回缩力下降和无效腔增加。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">肺泡间隔</div><br />
<div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">Alveolar Septum (点击展开)</div><br />
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[[Image:Alveolar_septum_histology_diagram.jpg|100px|肺泡间隔微观结构：毛细血管与上皮]]<br />
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<div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">微观结构：气血屏障载体</div><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0; width: 40%;">核心功能</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">[[气体交换]], [[力学支撑]]</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">主要成分</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">[[毛细血管]], [[弹力纤维]], [[胶原]]</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">屏障厚度</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #b91c1c;">$0.1 - 0.5$ $\mu m$ (薄侧)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">表面细胞</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">[[I型肺泡上皮]], [[II型肺泡上皮]]</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">病理改变</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">[[纤维化]] (增厚), [[气肿]] (断裂)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569;">相关检查</th><br />
<td style="padding: 6px 12px; color: #0f172a;">[[HRCT]], [[弥散功能]](DLCO)</td><br />
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肺泡间隔的结构设计极其精妙，为了兼顾“高效交换”与“结构支撑”，它在微观上分为两侧：<br />
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<li style="margin-bottom: 12px;"><strong>薄侧（Thin Side）：</strong> <br />
<br>专为<strong>[[气体交换]]</strong>设计。在此处，I 型肺泡上皮的基底膜与毛细血管内皮的基底膜融合，形成极薄的<strong>[[气血屏障]]</strong>（厚度仅 $0.1-0.2 \mu m$），使得氧气和二氧化碳能以极快速度通过扩散作用穿透。</li><br />
<li style="margin-bottom: 12px;"><strong>厚侧（Thick Side）：</strong> <br />
<br>专为<strong>[[液体交换]]</strong>和<strong>[[力学支撑]]</strong>设计。两层基底膜之间夹有间质成分（胶原纤维、弹力纤维、成纤维细胞、巨噬细胞等）。这里是肺间质淋巴回流的起始端，也是肺部发生水肿时液体首先积聚的部位（袖口征）。</li><br />
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<h2 style="background: #f1f5f9; color: #0f172a; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: 6px solid #0f172a; font-weight: bold;">细胞图谱：维护者与修复者</h2><br />
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肺泡间隔表面覆盖着两种关键的上皮细胞：<br />
<br>• <strong>[[I型肺泡上皮细胞]] (AT1)：</strong> 扁平状，覆盖 95% 的表面积，负责气体交换，终末分化，无法分裂。<br />
<br>• <strong>[[II型肺泡上皮细胞]] (AT2)：</strong> 立方状，分泌<strong>[[肺表面活性物质]]</strong>（降低表面张力），并作为干细胞在损伤后增殖分化为 AT1，修复间隔。<br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 20%;">病变类型</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569;">病理改变</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af;">临床后果 (DLCO/HRCT)</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[间质性肺炎]] (UIP/NSIP)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">间隔<strong>增厚</strong>、纤维化、胶原沉积。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">气体弥散距离增加 -> <strong>DLCO 下降</strong>。HRCT 示[[网格影]]、[[蜂窝肺]]。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[肺气肿]] (Emphysema)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">间隔<strong>断裂</strong>、破坏，肺泡融合扩大。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">交换面积减少，弹性回缩力丧失。HRCT 示无壁低密度区。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[肺水肿]] (Edema)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">间隔<strong>水肿</strong>，液体积聚在“厚侧”间质。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">急性低氧血症。HRCT 示[[小叶间隔增厚]]、[[磨玻璃影]]。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[癌性淋巴管炎]]</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">肿瘤细胞阻塞间隔淋巴管，呈串珠状增厚。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">严重的呼吸困难。HRCT 示不规则间隔增厚。</td><br />
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<span style="color: #0f172a; font-weight: bold; font-size: 1.05em; display: inline-block; margin-bottom: 15px;">学术参考文献 [Academic Review]</span><br />
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[1] <strong>West JB. (2012).</strong> <em>Respiratory Physiology: The Essentials.</em> <strong>Lippincott Williams & Wilkins</strong>. <br><br />
<span style="color: #475569;">[点评]：生理学经典教材，详细阐述了气血屏障的厚度对 Fick 扩散定律的影响，是理解肺泡间隔功能的基石。</span><br />
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[2] <strong>Raghu G, et al. (2018).</strong> <em>Diagnosis of Idiopathic Pulmonary Fibrosis. An Official ATS/ERS/JRS/ALAT Clinical Practice Guideline.</em> <strong>[[American Journal of Respiratory and Critical Care Medicine]]</strong>. <br><br />
<span style="color: #475569;">[点评]：定义了 UIP（普通型间质性肺炎）的病理特征，即时间空间异质性的肺泡间隔纤维化和成纤维细胞灶。</span><br />
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[3] <strong>Knudsen L, Ochs M. (2018).</strong> <em>The micromechanics of lung alveoli: structure and function of surfactant and tissue components.</em> <strong>[[Histochemistry and Cell Biology]]</strong>. <br><br />
<span style="color: #475569;">[点评]：综述了肺泡间隔的微观力学结构，重点分析了弹力纤维和表面活性物质在维持肺泡稳定性中的作用。</span><br />
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肺泡间隔 · 知识图谱<br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">组织结构</td><br />
<td style="padding: 10px 15px; color: #334155;">[[气血屏障]] • [[I型上皮]] • [[II型上皮]] • [[毛细血管]] • [[孔氏孔]]</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">间质成分</td><br />
<td style="padding: 10px 15px; color: #334155;">[[弹力纤维]] • [[胶原纤维]] • [[成纤维细胞]] • [[肺巨噬细胞]]</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">病理关联</td><br />
<td style="padding: 10px 15px; color: #334155;">[[肺纤维化]] • [[肺气肿]] • [[间质性肺病]] (ILD) • [[弥漫性肺泡损伤]]</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">影像征象</td><br />
<td style="padding: 10px 15px; color: #334155;">[[磨玻璃影]] • [[网格影]] • [[小叶间隔增厚]] • [[蜂窝征]]</td><br />
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