PSYB64H3 Chapter Notes - Chapter 2: Posterior Cerebral Artery, Anterior Cerebral Artery, Pia Mater
Document Summary
Phrenology argued that a person"s character could be determined by feeling the lumps on the skull. Babies born with a soft spot, or fontanel takes 18 months to fuse meninges (meh-nin-jees)the layers of membranes that cover the central nervous system and the peripheral nerves. Going from the skull to the brain, we find the dura mater, the arachnoid layer, and the pia mater. Between the arachnoid and pia mater layers is the subarachnoid space, which contains cerebrospinal fluid. In the peripheral nervous system, only the dura mater and pia mater layers cover the nerves. There is no cerebrospinal fluid in the peripheral nervous system. Only the dura mater and pia mater cover nerves that exit the brain and spinal cord. These nerves are referred to as the peripheral nervous system. Viruses and bacteria can invade the layers of the meninges, causing meningitis. Meningitis causes headache and stiffness of the neck, which can be followed by incoherence, drowsiness, coma, and death.
