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Neuroscience - How the Brain Works
Lecture 10: Somatosensory
Somatosensory
Skin Receptors
Respond to pressure; different somatic sensory receptors of the skin differ in receptive field size and in adaptation rate.
Mechanoreceptors
Thermoreceptors: where to heat the body
Dermatomes
Input from different areas mapped onto spinal cord.
Receptor specificity is carried into the spinal cord. So each slice has even more specific function
Mirrored in order of function importance in humuculous as well
Somatosensory
Multiple receptor types
Distributed thorughout the body
Represetnation in the brain that is topographic
Etc.
Motor control
Allows action in the world.
Rflex
Rhythmic
Voluntary
How is it controlled?
Motor unit - consists of a motorneuron and the muscle
Where? Oculomotor, cranial nerves, spinal cord
Innvervation ratio; the higher, the precision
Types of tissue
Skeletal muscle
Cardiac muscle
Smooth muscle
Muscle tone
Keeping muscles slightly contracted.
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