This medical anatomical diagram provides a sagittal view of the human head and neck, illustrating the interconnected dural venous sinus system, the cerebral ventricular system, and the extracranial venous drainage. Key vascular structures highlighted in blue include the sinus sagittalis superior and inferior, sinus rectus, sinus transversus, and sinus occipitalis. The diagram details the transition from intracranial dural sinuses to extracranial pathways, such as the V. jugularis interna, V. vertebralis, and V. brachiocephalica. Additionally, it displays the relationship between the dural sinuses and facial/orbital veins (e.g., V. ophthalmica superior, V. angularis). Overlaid in red is the ventricular system, clearly labeling the ventriculus lateralis, aquaeductus cerebri, and ventriculus quartus, demonstrating the spatial orientation of cerebrospinal fluid pathways relative to the major venous structures. Anatomical landmarks such as the foramen parietale and foramen mastoideum are indicated to show where emissary veins (V. diploica) bridge the intracranial and extracranial compartments. This educational illustration is designed to teach the complex neurovascular anatomy of cranial drainage and ventricular positioning.

Anatomical diagram depicting the venous drainage of the human head in a lateral view. The illustration highlights the relationship between intracranial dural sinuses and extracranial veins. Key structures identified include the Sigmoid Sinus (SS), which transitions into the Internal Jugular Vein (IJV) as it descends anteriorly. A significant anatomical feature shown is the Mastoid Emissary Vein (MEV), which provides a valveless communication pathway between the intracranial sigmoid sinus and the extracranial Posterior Auricular Vein (POV). The POV is situated posteriorly to the ear and runs roughly parallel to the upper portion of the IJV. The diagram effectively illustrates the concept of emissary veins as collateral drainage routes and their role in intracranial pressure regulation and potential surgical risk during posterior fossa or mastoid procedures. The focus is on neurovascular anatomy, specifically the communication between the dural venous system and superficial scalp veins.