The PPP and OSI protocols share the same physical layer, but PPP distributes the functions of LCP and NCP differently. PPP operates across any DTE/DCE interface. The only requirement imposed by PPP is a duplex circuit, either dedicated or switched, that can operate in either
From Wikipedia, the free encyclopedia. The cisterna magna (or cerebellomedullary cistern) is one of three principal openings in the subarachnoid space between the arachnoid and pia mater layers of the meninges surrounding the brain. The openings are collectively referred to as cisterns.he two other principal cisterns are the pontine cistern located between the pons and the medulla, and the interpeduncular cistern located between the cerebral peduncles. Cerebral spinal fluid can also be obtained by puncture of the cisterna magna (cistern puncture).
An ovarian cyst, also known as a pelvic mass, is a fluid-filled sac that may develop on one or both ovaries due to ovarian cancer. Ovarian cysts, though, are common during a womanâs childbearing years and may simply occur with her menstrual cycle. These cysts, called functional cysts, are typically not cancerous. Post-menopausal women with ovarian cysts have a higher risk of cancer. Symptoms of benign ovarian cysts listed above are similar to the symptoms of ovarian cancer.