神经元突触横截面图

一幅医学教科书风格的化学突触 3D 横截面插图。突触前终扣（浅蓝色圆球，剖开）内部可见突触囊泡（深青色小球）聚集在膜附近。突触间隙（白色空隙，20 nm 宽，虚线标注比例）清晰可见。突触后膜（暖米黄色）上嵌有受体蛋白（深橄榄色桶形）。神经递质分子（金色小点）漂浮于间隙中。8 pt 衬线字体箭头标注各结构。背景为青色到奶白色渐变，整体风格类似冷泉港图谱。

A scientific 3D cross-section illustration of a chemical synapse between two neurons, rendered in the style of a medical-textbook cutaway diagram. The presynaptic terminal (pale blue, rounded bulb shape) is sliced open to reveal synaptic vesicles (small cerulean spheres) clustered near the membrane. The synaptic cleft (20 nm gap) is clearly visible as a white space with faint dashed lines indicating scale. Postsynaptic membrane (warm tan) shows receptor proteins (dark-olive barrel shapes) embedded in the lipid bilayer. Neurotransmitter molecules (tiny gold dots) are shown mid-cleft. Arrow labels in 8 pt serif font: "Vesicle", "Presynaptic membrane", "Synaptic cleft", "Receptor", "Postsynaptic density". Subtle ambient occlusion shading, no harsh shadows. Teal-to-cream gradient background reminiscent of Cold Spring Harbor Atlas plates.