What structure in the ear is responsible for draining fluid?
The eustachian tube drains normal secretions of the middle ear by the mucociliary transport system and by repeated active tubal opening and closing, which allows secretions to drain into the nasopharynx.
How is the venous drainage of the brain different from other structures in the body?
The superficial veins primarily drain the cerebral cortex, whereas the deep veins drain the deep structures within the hemispheres. These veins do not typically follow the arterial supply and there is significant variation in anatomy between different subjects.
Does the middle ear contain fluid?
Small amounts of fluid are normally produced in the middle ear (behind the ear drum). This fluid usually drains out of the ear through the eustachian tube, which connects the middle ear to the back of the nose. A middle ear effusion occurs when fluid builds up in the space behind the eardrum.
What is cochlear aqueduct?
The cochlear aqueduct is a bony channel which contains the fibrous periotic duct and connects the perilymphatic space of the basal turn of the cochlea with the subarachnoid space of the posterior cranial cavity.
How is blood supplied to the brain?
At the base of the brain, the carotid arteries and vertebral arteries come together to form the Circle of Willis. This is a circle of arteries that pro- vide many paths for blood to supply oxygen and nutrients the brain. From the Circle of Willis, major arteries arise and travel to all parts of the brain.
How does the middle ear drain?
The Eustachian tube connects the middle ear with the back of the throat. Normally, this tube lets fluid drain out of the middle ear.
What is fluid in the middle ear called?
Otitis media with effusion (OME) is thick or sticky fluid behind the eardrum in the middle ear. It occurs without an ear infection.
What drains venous blood from the brain and delivers it to the internal jugular veins?
Left and right sigmoid sinuses collectively drain venous blood into the internal jugular vein, which exits at the jugular foramen.
What are the different types of venous drains of the brain?
Venous Drainage of the Brain 1 Superior Cerebral Veins. The superior cerebral veins are about 8-12 and drain the upper parts… 2 Middle Cerebral Veins. The middle cerebral veins are 4, 2 on every side: superficial middle cerebral… 3 Inferior Cerebral Veins. The inferior cerebral veins are many in number but smaller in size.
What is the venous drainage of the cerebrum?
Their venous drainage is complex, and rather uniquely, does not follow the arterial supply. The cerebrum, cerebellum and brainstem are drained by numerous veins, which empty into the dural venous sinuses . The spinal cord is supplied by anterior and posterior spinal veins, which drain into the internal and external vertebral plexuses.
Where do the cerebral veins drain into the brain?
Cerebrum. The cerebral veins empty into the dural venous sinuses situated within the subarachnoid space. The superficial system drains into the superior sagittal sinus, while the deep system drains into transverse, straight and sigmoid sinuses.
What vein drains into the outer ear?
Posterior auricular vein – drains the area of scalp superior and posterior to the outer ear. Retromandibular vein (posterior branch) – itself formed by the maxillary and superficial temporal veins, which drain the face.