PSYB65H3 Lecture Notes - Mesolimbic Pathway, Neuropeptide, Skeletal Muscle
Document Summary
Acetylcholine is associated with the rest and digest response and noradrenaline is associated with the fight or flight response. Motor neurons are cholinergic: acetylcholine is their main neurotransmitter. Motor neurons in the brain and spinal cord send their axons to the body"s skeletal muscles, including the muscles of the eyes, face, trunk, limbs, fingers and toes. At the skeletal muscle, cholinergic neurons are excitatory and produce muscular contractions. Both ans (para and sympa) are controlled by cholinergic neurons that emanate from the cns at two levels of the spinal cord. The cns neurons synapse with para neurons that also contain acetylocholine and with sympathetic neurons that contain norephinephrine. Ach neurons in the cns system synapse with sympathetic noradrengergic neurons to prepare the bodys organs for fight or flight. Cholinergic neurons in cns synapse with autonomic ach neurons in para to prepare the bodys organs to rest and digest. Endorphins are opinoid neuropeptides that affect the brains pain and pleasure center.