PSYC1101 Lecture Notes - Lecture 10: Direct Current, Spinal Canal, Midbrain
Document Summary
Small branched dendrites that carry impulses to the cell body. 1 long extension, an axon which carry impulses away from the cell body (nerve fibre: nerve fibres are arranged in bundles called nerves. Glial cells: surround neurons and hold them in place: manufacture nutrient chemicals that neurons need, absorb toxins and wastes that would damage or kill neurons. White matter: myelinated: myelin sheath is created outside the brain by schwann cells, wrap around the axon and create the myelin sheath, neurilemma surround the schwann cells and help with injury repair (minor injury) Myelin sheath functions: acts as an insulator. Resti(cid:374)g me(cid:373)(cid:271)ra(cid:374)e pote(cid:374)tial ( -70mv: neurons at rest have a stable separation of charges across the membrane, more positive charges in a layer outside the membrane, more negative charges in a layer inside the membrane. There is more na+ ions outside the membrane than there is k+ inside the membrane.
