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Anomalous Microwave Emission (AME) is an important emission component between10 and 60 GHz that is not yet fully understood. It seems to be ubiquituous inour Galaxy and is observed at a broad range of angular scales. Here we use thenew QUIJOTE-MFI wide survey data at 11, 13, 17 and 19 GHz to constrain the AMEin the Galactic plane ($|b|<10^\circ$) on degree scales. We built the spectralenergy distribution between 0.408 and 3000 GHz for each of the 5309 0.9$^\circ$pixels in the Galactic plane, and fitted a parametric model by considering fiveemission components: synchrotron, free-free, AME, thermal dust and CMBanisotropies. We show that not including QUIJOTE-MFI data points leads to theunderestimation (up to 50 %) of the AME signal in favour of free-free emission.The parameters describing these components are then intercompared, looking forrelations that help to understand AME physical processes. We find median valuesfor the AME width, $W_{\rm AME}$, and for its peak frequency, $\nu_{\rm AME}$,respectively of $0.560^{+0.059}_{-0.050}$ and $20.7^{+2.0}_{-1.9}$ GHz,slightly in tension with current theoretical models. We find spatial variationsthroughout the Galactic plane for $\nu_{\rm AME}$, but only with reducedstatistical significance. We report correlations of AME parameters with certainISM properties, such as that between the AME emissivity (which shows variationswith the Galactic longitude) and the interstellar radiation field, and thatbetween the AME peak frequency and dust temperature. Finally, we discuss theimplications of our results on the possible molecules responsible for AME.

QUIJOTE scientific results -- X. Spatial variations of Anomalous Microwave Emission along the Galactic plane