Completedly overhauled fig_auditory_pathway.

Created new in-figure linked SVGs with clearer naming scheme.
Removed outdated image components.

figures/model_elements_b1_text.svg

@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+  "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns:xlink="http://www.w3.org/1999/xlink" width="216pt" height="216pt" viewBox="0 0 216 216" xmlns="http://www.w3.org/2000/svg" version="1.1">
+ <metadata>
+  <rdf:RDF xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+   <cc:Work>
+    <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/>
+    <dc:date>2026-01-27T14:51:33.056749</dc:date>
+    <dc:format>image/svg+xml</dc:format>
+    <dc:creator>
+     <cc:Agent>
+      <dc:title>Matplotlib v3.10.5, https://matplotlib.org/</dc:title>
+     </cc:Agent>
+    </dc:creator>
+   </cc:Work>
+  </rdf:RDF>
+ </metadata>
+ <defs>
+  <style type="text/css">*{stroke-linejoin: round; stroke-linecap: butt}</style>
+ </defs>
+ <g id="figure_1">
+  <g id="axes_1">
+   <g id="text_1">
+    <!-- $b_1$ -->
+    <g transform="translate(78.616376 127.922734) scale(0.8 -0.8)">
+     <defs>
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+z
+" transform="scale(0.015625)"/>
+      <path id="CMR17-31" d="M 1702 4058 
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+" transform="scale(0.015625)"/>
+     </defs>
+     <use xlink:href="#CMMI12-62" transform="scale(0.996264)"/>
+     <use xlink:href="#CMR17-31" transform="translate(41.475874 -14.943915) scale(0.697382)"/>
+    </g>
+   </g>
+  </g>
+ </g>
+</svg>