Emissary
Emissary (Medicine)
Emissary (pronounced: /ˈɛmɪˌsɛri/), in the context of medicine, refers to small blood vessels that connect the dura mater with the scalp. These vessels, known as emissary veins, play a crucial role in the circulatory system by aiding in the drainage of blood from the brain to the exterior of the skull.
Etymology
The term 'emissary' is derived from the Latin word 'emissarius', meaning 'sent out'. In the medical context, it refers to the function of these veins as they 'send out' or drain blood from the brain to the scalp.
Related Terms
- Dura Mater: The outermost layer of the meninges, the three membranes that cover the brain and spinal cord. Emissary veins pass through the dura mater to connect the brain with the scalp.
- Venous Sinus: These are channels found between layers of dura mater in the brain. They receive blood from emissary veins and other smaller veins in the brain.
- Cranium: The part of the skull that encloses the brain. Emissary veins are located in the cranium, connecting the brain to the scalp.
- Cerebrovascular System: This refers to the blood vessels and the circulation of blood within the brain. Emissary veins are a part of this system.
- Intracranial Pressure: This is the pressure inside the skull and thus in the brain tissue and cerebrospinal fluid. Emissary veins can affect intracranial pressure as they help drain blood from the brain.
See Also
External links
- Medical encyclopedia article on Emissary
- Wikipedia's article - Emissary
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