How your brain and nervous system work
... major tidy-up and gets rid of lots of connections it isn’t using This is a critical and delicate process. It is thought that conditions such as schizophrenia could be the result of it going wrong Some evidence suggests that using drugs can disrupt this process ...
... major tidy-up and gets rid of lots of connections it isn’t using This is a critical and delicate process. It is thought that conditions such as schizophrenia could be the result of it going wrong Some evidence suggests that using drugs can disrupt this process ...
Motor system - Brain Facts
... neuronal cell bodies forming this circuitry above and below the site of injury survive the trauma. The goal of spinal cord injury research is to reconnect the wiring that controls muscle movement and provides sensory information to the brain. can neurons in the spinal cord regenerate and make not on ...
... neuronal cell bodies forming this circuitry above and below the site of injury survive the trauma. The goal of spinal cord injury research is to reconnect the wiring that controls muscle movement and provides sensory information to the brain. can neurons in the spinal cord regenerate and make not on ...
E4 - Neurotransmitters and Synapses - IBDPBiology-Dnl
... E.g. this Neuron needs a 2 more “+” than “-” before it can generate an action potential. ...
... E.g. this Neuron needs a 2 more “+” than “-” before it can generate an action potential. ...
Nervous tissue Nervous system
... rER, are found in the dendrites, especially in the base of the dendrites. ...
... rER, are found in the dendrites, especially in the base of the dendrites. ...
D:spinal motor neurons Kuwada.wpd
... with a with a tension gauge) is recorded (see Fig. 3). Again, doing this over many motor units indicates that contraction times can be divided into fast, slow and intermediate and correlate well with those that have fast, slow and intermediate conduction velocities. Figure 4 displays the contraction ...
... with a with a tension gauge) is recorded (see Fig. 3). Again, doing this over many motor units indicates that contraction times can be divided into fast, slow and intermediate and correlate well with those that have fast, slow and intermediate conduction velocities. Figure 4 displays the contraction ...
The Cerebral Cortex and Higher Intellectual
... • leading to a depletion of striatal dopamine • some degeneration of other dopamine pathways too ...
... • leading to a depletion of striatal dopamine • some degeneration of other dopamine pathways too ...
Combined Nerve Palsy - Alpha Hand Surgery Centre
... Palsy • Vast loss of strength and stability of fingers and thumb • Sensibility only ulnar ½ ring and small fingers • Reconstruction results in only marginally functional hand only slightly better than ...
... Palsy • Vast loss of strength and stability of fingers and thumb • Sensibility only ulnar ½ ring and small fingers • Reconstruction results in only marginally functional hand only slightly better than ...
Uses of Genomic Information in the Diagnosis of Disease Bethany
... Mechanism of Action • Local anesthetic drugs act mainly by inhibiting sodium influx through sodium-specific ion channels in the nerve cytoplasm – Sodium ions cannot flow in, so potassium ions cannot flow out, thereby preventing the depolarization of the nerve. ...
... Mechanism of Action • Local anesthetic drugs act mainly by inhibiting sodium influx through sodium-specific ion channels in the nerve cytoplasm – Sodium ions cannot flow in, so potassium ions cannot flow out, thereby preventing the depolarization of the nerve. ...
4.a. the trigeminal system
... 3. Diagram the corneal reflex: the afferent and efferent limbs as well as nuclei involved in the brainstem. 4. If a person does not blink, how would you determine if the problem were in the sensory (afferent) limb, motor (efferent) limb, or brainstem interconnections for the corneal reflex? 5. Expla ...
... 3. Diagram the corneal reflex: the afferent and efferent limbs as well as nuclei involved in the brainstem. 4. If a person does not blink, how would you determine if the problem were in the sensory (afferent) limb, motor (efferent) limb, or brainstem interconnections for the corneal reflex? 5. Expla ...
the electrophysiology of photoreceptors in the nudibranch mollusc
... Text-fig. 4. Effects of extrinsic currents on the amplitude of receptor responses to light. The stimulus intensity was 0-56 mW/cm1; its timing is indicated by the horizontal line. Calibration is 15 mV, 10 sec. ...
... Text-fig. 4. Effects of extrinsic currents on the amplitude of receptor responses to light. The stimulus intensity was 0-56 mW/cm1; its timing is indicated by the horizontal line. Calibration is 15 mV, 10 sec. ...
W5D3H3: Sensory Receptors
... encoded by the nervous system is essential to a bigpicture understanding of how stimuli are detected and interpreted by the nervous system. Because defects in this process constrain the well-being and quality of life for many people and because changes in how stimuli are detected and integrated can ...
... encoded by the nervous system is essential to a bigpicture understanding of how stimuli are detected and interpreted by the nervous system. Because defects in this process constrain the well-being and quality of life for many people and because changes in how stimuli are detected and integrated can ...
Sensory receptors - E
... Overview: Sensing and Acting • Bats use sonar to detect their prey. • Moths, a common prey for bats, can detect the bat’s sonar and attempt to flee. • Both organisms have complex sensory systems that facilitate survival. • These systems include diverse mechanisms that sense stimuli and generate ...
... Overview: Sensing and Acting • Bats use sonar to detect their prey. • Moths, a common prey for bats, can detect the bat’s sonar and attempt to flee. • Both organisms have complex sensory systems that facilitate survival. • These systems include diverse mechanisms that sense stimuli and generate ...
X- and Y-Cells in the Dorsal Lateral Geniculate
... long as it was presented (30 to 50 seconds) whereas no Y-cell responded for more than 1 or 2 seconds to such a stimulus, and most Y-cell responses were considerably briefer (see Fig. 2A). Field center sizes and latencies to electrical stimulation for these geniculate neurons were also similar to ana ...
... long as it was presented (30 to 50 seconds) whereas no Y-cell responded for more than 1 or 2 seconds to such a stimulus, and most Y-cell responses were considerably briefer (see Fig. 2A). Field center sizes and latencies to electrical stimulation for these geniculate neurons were also similar to ana ...
BSCI338N, Spring 2013, Dr. Singer
... different receptor types have different field sizes on different skin surfaces to detect textures, skin motion, vibration, or skin stretch two-point discrimination: calipers test integrity of somatosensory input deficit indicates peripheral neuropathy receptive fields are more discriminatory in fing ...
... different receptor types have different field sizes on different skin surfaces to detect textures, skin motion, vibration, or skin stretch two-point discrimination: calipers test integrity of somatosensory input deficit indicates peripheral neuropathy receptive fields are more discriminatory in fing ...
Autosomal recessive spino-olivo-cerebellar degeneration without
... but still fully independent. He complained of bad vision, difficulty in walking and slight numbness in his legs. He did not take any drugs other than for diabetes, and he denied the use of alcohol. General physical examination was unremarkable except for a severe hypertension of 180/130 mm Hg. He wa ...
... but still fully independent. He complained of bad vision, difficulty in walking and slight numbness in his legs. He did not take any drugs other than for diabetes, and he denied the use of alcohol. General physical examination was unremarkable except for a severe hypertension of 180/130 mm Hg. He wa ...
Biology 232 - Request a Spot account
... 2) supporting cells – columnar epithelium support and protect olfactory receptors 3) basal stem cells – divide and differentiate to produce new receptors olfactory glands – in underlying connective tissue secrete mucus on surface – dissolves odorant molecules Vomeronasal Organ – specialized olfactor ...
... 2) supporting cells – columnar epithelium support and protect olfactory receptors 3) basal stem cells – divide and differentiate to produce new receptors olfactory glands – in underlying connective tissue secrete mucus on surface – dissolves odorant molecules Vomeronasal Organ – specialized olfactor ...
Updating a Research Agenda for Cerebral Palsy Drs. Laura
... Randomized, active control, blind outcomes assessment using CIMT in 52 children 30 months to 14 y.o. with hemiplegic CP Dose – 90 hours of wearing constraint for 2 weeks in a camp setting ...
... Randomized, active control, blind outcomes assessment using CIMT in 52 children 30 months to 14 y.o. with hemiplegic CP Dose – 90 hours of wearing constraint for 2 weeks in a camp setting ...
Vestibular System
... nerve (which hair cells of the spiral organ; what place along the basilar membrane) are maximally active (for > 200 Hz). As the pitch (Hz) of a sound increases, the peak amplitude of basilar membrane displacement regresses, from the apex (longest fibers) toward the base (shortest fibers) of the coch ...
... nerve (which hair cells of the spiral organ; what place along the basilar membrane) are maximally active (for > 200 Hz). As the pitch (Hz) of a sound increases, the peak amplitude of basilar membrane displacement regresses, from the apex (longest fibers) toward the base (shortest fibers) of the coch ...
Trigeminal system
... ways are they similar? Different? Try drawing this on the Haines atlas diagram at the end of the lecture. ...
... ways are they similar? Different? Try drawing this on the Haines atlas diagram at the end of the lecture. ...
File
... the thumb and index finger, the long flexor of the thumb is used to substitute for the thumb adductor, resulting in flexion of the thumb at the interphalangeal ...
... the thumb and index finger, the long flexor of the thumb is used to substitute for the thumb adductor, resulting in flexion of the thumb at the interphalangeal ...
Hearing, I: The Cochlea - American Journal of Neuroradiology
... the round window by otosclerotic plaques may render prosthetic stapedectomy ineffective because of the incompressible nature of the labyrinthine fluid. It is interesting that the entire fluid volume of the perilymphatic spaces of the inner ear is only 0.2 mL, yet without it hearing would not be poss ...
... the round window by otosclerotic plaques may render prosthetic stapedectomy ineffective because of the incompressible nature of the labyrinthine fluid. It is interesting that the entire fluid volume of the perilymphatic spaces of the inner ear is only 0.2 mL, yet without it hearing would not be poss ...
Get the full text version of this article (PDF-file, 120 KB)
... differentiate the sensory fibers. I and II are the DSL lines of nerve transmission, large diameter, heavily myelinated fibers that carry proprioceptive information, position sense, and light touch. Group III is thinly myelinated, slower than DSL and carries nociceptive and other sensory information. ...
... differentiate the sensory fibers. I and II are the DSL lines of nerve transmission, large diameter, heavily myelinated fibers that carry proprioceptive information, position sense, and light touch. Group III is thinly myelinated, slower than DSL and carries nociceptive and other sensory information. ...
Rheobase
Rheobase is a measure of membrane excitability. In neuroscience, rheobase is the minimal current amplitude of infinite duration (in a practical sense, about 300 milliseconds) that results in the depolarization threshold of the cell membranes being reached, such as an action potential or the contraction of a muscle. In Greek, the root ""rhe"" translates to current or flow, and ""basi"" means bottom or foundation: thus the rheobase is the minimum current that will produce an action potential or muscle contraction.Rheobase can be best understood in the context of the strength-duration relationship (Fig. 1). The ease with which a membrane can be stimulated depends on two variables: the strength of the stimulus, and the duration for which the stimulus is applied. These variables are inversely related: as the strength of the applied current increases, the time required to stimulate the membrane decreases (and vice versa) to maintain a constant effect. Mathematically, rheobase is equivalent to half the current that needs to be applied for the duration of chronaxie, which is a strength-duration time constant that corresponds to the duration of time that elicits a response when the nerve is stimulated at twice rheobasic strength.The strength-duration curve was first discovered by G. Weiss in 1901, but it was not until 1909 that Louis Lapicque coined the term ""rheobase"". Many studies are being conducted in relation to rheobase values and the dynamic changes throughout maturation and between different nerve fibers. In the past strength-duration curves and rheobase determinations were used to assess nerve injury; today, they play a role in clinical identification of many neurological pathologies, including as Diabetic neuropathy, CIDP, Machado-Joseph Disease, and ALS.