Which of the following is represented by the RED line in the…

Which of the following is represented by the RED line in the diagram below?   Image description: Depiction of a reflex arc with 3 images connected by lines. The top image shows a needle pricking the skin. A blue line connects this image with an image of a cross-section of the spinal cord, showing the blue line coming close to a short green line within the grey matter. The other end of the green line is very close to a red line that extends out to an image of a skeletal muscle.

The arrows are pointing to the _________. Image description…

The arrows are pointing to the _________. Image description: A lateral view of the inner ear shows a narrow, tubular passage running from the middle ear region downward and slightly forward. It appears as a small channel connecting a cavity in the skull to a space near the upper throat, angled diagonally.