CAS BI 106 Lecture 15: Bio - Lecture 15 and 16
2 Jul 2020
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From last lecture: there are no pain receptors in the brain but the dura is sensitive to pain. Pulling on the scalp (such as when your muscles in your neck are tensed for a long time) or changes in the pressure in the blood sinuses causes pain the dura mater. Caffeine is effective as a component of headache medicines. It constricts the blood vessels, relieving the pressure exerted by the blood sinuses on the dura. All three meninges cover the brain and the spinal cord. The meninges are continues down till the end of the spinal cord. There are some spaces in the brain called ventricles. There are continuous with each other and with the central canal of the spinal cord. Ventricles are the place where the csf is generated. There are 4 ventricles (from superior to inferior): 2 lateral ventricles (medial portion of cerebrum) Lateral ventricles are connected to the third ventricle by the interventricular foramen.
