The change in membrane potential produces two types of signals known as graded potentials and action potentials. Graded potentials and action potentials both can communicate signals and both potentials can involve depolarization and hyperpolarization. Depolarization is when the inside of the cell becomes less negative and hyperpolarization is when the cell becomes more negative and more farther away from 0mV.
In contrast, graded potentials are short-lived and localized but action potentials travel long distances along axons. The magnitude of graded potentials can change and the magnitude of action potentials is always the same regardless of the cell ty...
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...l spinothalamic tracts (Marieb and Hoehn 469). Information travels from the spine up to the thalamus within the diencephalon area of the brain. This pathway involves impulses for pain and temperature.
The spinocerebellar pathway conveys information about muscle or tendon stretch to the cerebellum and consists of ventral and dorsal spinocerebellar tracts (Marieb and Hoehn 469). The fibers of the spinocerebellar pathways do not decussate, which means to cross over. Descending pathways delivers efferent impulses from the brain to the spinal cord and is divided into two groups. One of the groups is direct pathways. Direct pathways originate mainly with the pyramid neurons located in the precentral gyri in the brain (Marieb and Hoehn 470). The lateral pyramidal (corticospinal) pathway is a direct pathway that controls skilled voluntary movements (Marieb and Hoehn 472).
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