What are the dural venous sinuses?
Dural venous sinuses are a group of sinuses or blood channels that drains venous blood circulating from the cranial cavity. It collectively returns deoxygenated blood from the head to the heart to maintain systemic circulation.
What are the four paranasal sinuses and their location?
Paranasal sinuses are a group of four paired air-filled spaces that surround the nasal cavity. The maxillary sinuses are located under the eyes; the frontal sinuses are above the eyes; the ethmoidal sinuses are between the eyes and the sphenoidal sinuses are behind the eyes.
What are the three sinuses?
There are four pairs of sinuses, named for the bones that they’re located in:
- The maxillary sinuses are located on each side of your nose, near the cheek bones.
- The frontal sinuses are located above the eyes, near your forehead.
- The ethmoid sinuses are located on each side of the bridge of your nose, near your eyes.
What is function of dural venous sinuses?
They receive blood from the cerebral veins, receive cerebrospinal fluid (CSF) from the subarachnoid space via arachnoid granulations, and mainly empty into the internal jugular vein.
What is a venous sinus?
Venous Sinuses (or Dural Venous Sinuses) are the large veins of the brain. Their function is to facilitate blood flow from the brain to the neck and the heart. The venous sinuses are divided in the transverse and sigmoid sinuses and they are located on the surface of the brain.
What are the 4 nasal sinuses?
There are four paranasal sinuses, each corresponding with the respective bone from which it takes its name: maxillary, ethmoid, sphenoid, and frontal.
Where does the blood come from for the dural sinus?
Dural Venous Sinuses. 1. Superior sagittal sinus: lies at the superior attached border of falx cerebri. Receives blood from superior cerebral veins (bridging veins) and emissary veins (connects extracranial venous system with intracranial venous sinuses – potention route of infection).
How is the dura related to the venous sinuses?
Dura is sensitive to pain, especially where it is related to the dural venous sinuses and meningeal arteries. Headaches can occur due to stimulation of the sensory nerve endings in the dura. It is innervated by all 3 divisions of the trigeminal nerve, sensory fibers of C2, C3 and meningeal branches of CN X and CN XII.
How does the superior sagittal sinus drain the dura?
The superior sagittal sinus receives tributaries from several superior cerebral veins that run deep to the arachnoid mater on both hemispheres. The veins pierce the arachnoid and dura as they approach the sagittal sinus, where they will drain their contents.
Where are the venous sinuses located in the body?
Dural venous sinuses. Dural venous sinuses are venous channels located intracranially between the two layers of dura mater (endosteal layer and meningeal layer). They can be conceptualised as trapped epidural veins. Unlike other veins in the body they run alone, not parallel to arteries. Furthermore, they are valveless,…