Early development of veins and sinuses at and around the posterior cranial fossa seemed not to be shown by photographs except for our recent study (Ann Anat, 2020). Examination of histological sections of 38 fetuses at 10 to 16 weeks gestational age (GA) demonstrated that: 1) the superior petrosal sinus passed posterosuperiorly through the tentorium cerebelli and, distant and lateral to both the cerebellum and internal ear, drained into the transverse sinus ; 2) the superior sagittal sinus was underdeveloped, and the inferior sagittal sinus was not yet evident; 3) the straight sinus (STS) originated from a joining of the bilateral pial veins from the lateral ventricular choroid plexus, passed through the inferoposterior part of the falx cerebri, reached the initial confluens sinuum, and then divided into the bilateral transverse sinuses. The STS origin was immediately behind the pineal body, and near the inferoposterior end of the third ventricle. The falx had a thick attachment to the tentorium below the entire course of the STS and was behind other parts of the brain. Therefore, the development and growth of the posterior dural system seemed to be independent from brain growth, and occurred well before the cerebellum grew to fill the posterior cranial fossa. A basic configuration of intracranial veins and sinuses, including embryonic transient veins (such as the vena capitis prima) seemed to be established by venous return from the choroid plexus and cranial wall, without greatly increasing the abundance of neuronal or glial cells in the brain.

除了我们最近的研究（Ann Anat，2020）外，照片似乎没有显示后颅窝处和周围静脉和窦的早期发育。对 38 个 10 至 16 周胎龄 (GA) 胎儿的组织切片检查表明：1) 岩上窦后上方通过小脑幕，并在小脑和内耳的远处和外侧引流到横窦; 2）上矢状窦发育不全，下矢状窦尚不明显；3）直窦（STS）起源于双侧脑室脉络丛的软脑膜静脉汇合处，经脑镰后下方，到达最初汇合窦，然后分为双侧横窦。STS 起源于紧邻松果体的后面，靠近第三脑室的后下端。镰与整个 STS 过程下方的小脑幕有一个厚厚的附件，位于大脑其他部分的后面。因此，后硬脑膜系统的发育和生长似乎独立于大脑的生长，并且发生在小脑生长填充后颅窝之前。颅内静脉和鼻窦的基本结构，包括胚胎暂时性静脉（如头静脉）似乎是由脉络丛和颅壁的静脉回流建立的，而没有大大增加大脑中神经元或神经胶质细胞的丰度。镰与整个 STS 过程下方的小脑幕有一个厚厚的附件，位于大脑其他部分的后面。因此，后硬脑膜系统的发育和生长似乎独立于大脑的生长，并且发生在小脑生长填充后颅窝之前。颅内静脉和鼻窦的基本结构，包括胚胎暂时性静脉（如头静脉）似乎是由脉络丛和颅壁的静脉回流建立的，而没有大大增加大脑中神经元或神经胶质细胞的丰度。镰与整个 STS 过程下方的小脑幕有一个厚厚的附件，位于大脑其他部分的后面。因此，后硬脑膜系统的发育和生长似乎独立于大脑的生长，并且发生在小脑生长填充后颅窝之前。颅内静脉和鼻窦的基本结构，包括胚胎暂时性静脉（如头静脉）似乎是由脉络丛和颅壁的静脉回流建立的，而没有大大增加大脑中神经元或神经胶质细胞的丰度。并且发生在小脑长到充满后颅窝之前。颅内静脉和鼻窦的基本结构，包括胚胎暂时性静脉（如头静脉）似乎是由脉络丛和颅壁的静脉回流建立的，而没有大大增加大脑中神经元或神经胶质细胞的丰度。并且发生在小脑长到充满后颅窝之前。颅内静脉和鼻窦的基本结构，包括胚胎暂时性静脉（如头静脉），似乎是由脉络丛和颅壁的静脉回流建立的，而没有大大增加大脑中神经元或神经胶质细胞的丰度。