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Definition
| classification based on common ancestor. |
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| Evolutionary relatedness is determined by |
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| recency of common ancestor |
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| phylogram: short line indicates |
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| method of determining relationships of groups by analyzing features |
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| many shared homologous features indicate |
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| ancestral character state |
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Definition
| seen in the early ancestors of an organism |
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| evolutionary innovation not seen in the early ancestors of an organism |
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| characters are similar but no common ancestor |
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| homoplasies due to convergent evolution |
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| group thought to be closely related to the ingroup |
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| scientific preference for the simplest explanation |
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| a shared homologous derived character state. |
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| independent origins of a feature in unrelated lineages |
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| device used to measure rate of water uptake by a shoot. |
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Term
| cell bodies of sensory neurons are located in the... |
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Definition
| dorsal root ganglia near the spinal cord |
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Term
| one branch from each sensory neuron extends into the ---- and the other into the ---- |
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Definition
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| highly sensitive terminal endings, senstive to just one type of stimulus i.e. touch |
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| electrical impulses intiated by neurons in the spinal cord |
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| neuron-->spinal cord-->other neurons in spinal cord-->thalamus-->somatosensory cortex of cerebrum |
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| neurons of the somatosensory cortext of the brain |
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| conscious realization or awareness |
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| high sensitivity results from |
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Definition
| large brain space devoted to perception of touch and high density of touch sensory nerve fibers and receptor endings |
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Definition
| touch sensitive free nerve ending |
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| temperature sensitive free nerve endingd |
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| pain sensitive free nerve ending |
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Definition
| nerve fiber endings encapsulated and sensitive to pressure and vibration |
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Term
| merkel's discs/ merkel's cells |
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Definition
| fibers sensitive to touch and pressure and important in localizing touch sensation to different area of the body |
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Definition
| fibers very sensitive to touch. abundant in smooth skin of toes, fingertips, palms and soles of feet. important in touch localization texture discrimination |
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Definition
| sensitive to hair displacement |
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Definition
| ability to relocate by memory a spot on the skin that has just been touched. |
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