Extended Data Fig. 8: The tendons of yaw muscles are coupled.
From: Motor neurons generate pose-targeted movements via proprioceptive sculpting
(a) Confocal image of the dorsal neck musculature showing the OH muscles and the large, curved tendon of the TH muscles. Red = muscles (F-actin stained with Phalloidin), blue = tendons and cuticle (chitin binding Calcofluor White). Yellow arrows indicate points of coupling between the OH and TH tendons. The three small OH muscles originate from the midline and travel anterolaterally to where they connect to the large, curved TH tendon via small tendon tendrils. (b) shows a higher magnification of the coupling between the OH 3 muscle’s tendon and that of the TH muscle. (c) Diagram of the image in a. Muscles are shown in red, the TH muscle tendon is shown in orange and the OH muscle tendons are shown in blue. Such an arrangement is likely to allow the OH muscles to change the line of action of the TH muscle by altering its tendon’s geometry. Such inter-muscle interactions will not be captured by our linear model.
