Some are psychological, i.e. the fear response causes them to faint, or physical, such as the fainting that occurs when we over exert ourselves. Vagal nerve fainting (also known as vasovagal syncope) is quite simply any loss of consciousness caused by the vagus nerve. The vagus nerve runs directly from the brain stem, in front of the ears and down the neck towards the chest and abdomen. It branches off in several places to provide communication with the brain to a number of organs, such as the heart and the stomach.
The floor of the third ventricle is formed by a number of structures including the hypothalamus, subthalamus, mammilary bodies, infundibulum (pituitary stalk), and the tectum of the midbrain. The lateral walls of the third ventricle are formed by the walls of the left and right thalamus.
There are two lateral ventricles- one on each side of the cerebral cortex. The lateral ventricles are continuous with the third ventricle, which is lower in the brain. The third ventricle is continuous with the fourth ventricle, which runs along the brainstem. The ventricles are all an important part of the âventricular system.â The ventricles are interconnected with each other, and also with the central canal of the spinal cord and with the subarachnoid space (a space between two of the linings that separate the brain from the skull).