LIFESCI 2 Lecture Notes - Lecture 8: Spinal Nerve, Grey Matter, Temporal Lobe
Document Summary
Pns - cranial and spinal nerves that connect cns to tissues. Neuron- excitable cell that communicates via an axon. Efferent- away from cns: voluntary- conscious movements. Spinal cord: gray matter- center and cell bodies of spinal neurons, white matter- surrounds gray matter and has axons that conduct info. Spinal reflex - afferent change to efferent without brain. Stretch receptors send action potentials from dorsal horn to ventral, then motor neurons that send action potentials to leg muscles to contract. Nucleus- a distinct group with commonality of neurons in cns. Reticular activating system- in high part of system, controls waking and sleep. Limbic system(telencephalon) more primitive parts of brainstem - basic physiological drives(hunger: amygdala- fear, hippocampus- short term to long term memory. Cerebral cortex- sheet of gray matter covers each hemisphere fits into skull. Foldings/convolutions- gyri(ridges) and sulci(valleys) allow fit into skull.
