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Canada (509,186)
Neuroscience (303)
NROC64H3 (73)
Lecture 5

Lecture 5.docx

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Matthias Niemeier

Lecture 5 Short answer question  What is the purpose of the VOR o Counter-clockwise rotation of head results in the clockwise rotation of eyes o Medial rectus muscle rotates eye towards the nose o Lateral rectus muscle rotates eye away from nose o Semicircular canal  Stimulates vestibular nucleus  Vestibular nucleus connected to o Left oculomotor nucleus  Stimulating medial rectus o Contraction of one side and relaxation of other side Lecture 5 Notes  Mechanoreceptors differ in their receptive field size o Meissner corpuscles are very small  Detailed resolution for what you are touching  Rapid adaptation  Sensitive to frequencies around 50 Hz  Skin slip sensation o Grasping things o Pacinian corpuscles are much larger  Rapid adaptation  Transient vs sustained firing o Transient firing at the beginning and at the end o Sustained firing throughout  What does adaptation rates mean? How is it fast or slow?  Meissner vs Pacinian corpuscles and their thresholds (SLIDE 9)  Two point discrimination influenced by o Density of receptors o Neural capacity o Convergence o Receptive field size o Special mechanisms  Dorsal root ganglion cell o Cluster of neural cells  Primary afferent neurons o Four types of axons from skin  Aa  AB  Ad  C o Diameters and speed sizes decrease as you move down the four group types  The wider the diameter of an axon, the fast the transmission of information o Muscle reflexes, motor control  The spinal cord o Four segments  Cervical  Thoracic  Lumbar  Sacral o Spinal cord ends ~3rd lumbar vertebra  Cauda equina  Lumbar puncture  Anaesthetics o ~30 nerve endings  Dermatomes o 1:1 ratio of dermatome to spinal nerve ratio  Dorsal column - medial lemniscal pathway o Ipsilateral transmission of neural signals  Decussation to contralateral side at the medulla o For the skin except for the face  Trigeminal touch pathway o Skin touch sensation at the face  Somatosensory cortex o Brodmanns areas  Primary  1  2  3a  3b  Secondary  5  7  Somatotopy o
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