Paw Withdrawal
Paw Withdrawal - Related Videos
11:51
Blood Withdrawal I
0 Views •
2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN Blood collection is a common requirement for research studies that involve mice and rats. The method of blood withdrawal in mice and rats is dependent upon the volume of blood needed, the frequency of the sampling, the health status of the animal to be bled, and the skill level of the technician. All methods discussed-retro-orbital sinus bleeds, initial tail snip bleeds, and intracardiac...
06:32
Blood Withdrawal II
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2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN The collection of blood from mice and rats for analysis can be done through a variety of methods. Each method of collection has variations in the type of restraint required, the invasiveness of the procedure, and the necessity of a general anesthetic.1Historically, the use of the retro-orbital sinus cavity has been used, but not without debate. The controversy related to the potential tissue...
07:49
Measuring Changes in Tactile Sensitivity in the Hind Paw of Mice Using an Electronic von Frey Apparatus
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Cited by 105 •
2013
Electronic von Frey measurements are an effective and improved alternative to classical von Frey filaments, as they allow rapid and precise measurement of changes in rodent mechanical withdrawal thresholds to continuously applied pressure stimuli before and after an inflammatory event.
09:14
Paw-Dragging: a Novel, Sensitive Analysis of the Mouse Cylinder Test
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Cited by 53 •
2015
Classical forelimb asymmetry analysis of the cylinder test is routinely used to assess behavioural deficits in rats following brain injury or stroke; however, it fails to detect consistent deficits in mice. This study demonstrates that quantifying paw-dragging behaviour is a more sensitive analysis of brain injury in mice.
01:18
Withdrawal of a Partner
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2026
A partner's withdrawal from a partnership signifies a significant change in the firm's composition, typically occurring due to voluntary retirement, health concerns, or other personal decisions. This event necessitates several accounting adjustments to ensure a fair settlement for the departing partner while maintaining the equity of continuing partners. The process involves determining the partner’s final capital balance by adjusting for their share in accumulated profits, reserves,...
FAQs
A potentially harmful thermal, mechanical, or chemical stimulus activates peripheral nociceptors. Their afferent signals travel to the spinal cord, where interneurons connect sensory input with motor neurons. These motor neurons activate flexor muscles, producing rapid retraction of the paw. This spinal pathway allows the response to occur quickly, before researchers assess broader sensory or pain-related changes.
Different stimulus classes activate peripheral nociceptors through distinct experimental conditions, allowing investigators to examine sensory responses across more than one modality. The resulting behavior can be quantified through withdrawal latency, force threshold, or response frequency. Selecting and standardizing the stimulus type is therefore important when comparing sensory nerve function or evaluating changes in nociceptive sensitivity.
The response is a protective nociceptive reflex organized through peripheral sensory input and spinal interneuron and motor-neuron circuits. Because this withdrawal can occur through a reflex pathway, its measurement does not by itself establish the animal’s conscious experience of pain. Investigators therefore interpret paw-withdrawal findings as evidence of sensory and pain-related responses rather than as a direct measure of subjective pain.
These measures describe different observable features of the reflex. Withdrawal latency records how quickly retraction occurs, force threshold identifies the force associated with withdrawal, and response frequency captures how often a response occurs. Together, they can help assess hyperalgesia, analgesic efficacy, and sensory nerve function, depending on the experimental question and the response measure selected.
A typical workflow applies a standardized noxious thermal, mechanical, or chemical stimulus to the paw, observes the resulting withdrawal, and records a defined behavioral measure. Investigators may quantify latency, force threshold, or response frequency. Keeping the stimulus and measurement approach consistent supports comparisons among experimental conditions, including studies of altered sensitivity or candidate analgesic effects.
Researchers use this assay in preclinical models to investigate hyperalgesia, examine sensory nerve function, and evaluate analgesic efficacy. It is particularly useful when a study needs a quantifiable behavioral response to a noxious stimulus. The resulting measurements can help compare experimental conditions and determine whether a candidate intervention changes sensory or pain-related responses.
An analgesic study can compare withdrawal measurements across experimental conditions using latency, force threshold, or response frequency. Changes in these outcomes may indicate altered nociceptive sensitivity or an analgesic effect. Because the assay measures a reflex rather than conscious pain directly, its findings provide preclinical evidence that should be interpreted within the broader context of sensory and pain-related research.