Localization of Tibialis Anterior Motor Points

The endplates in the TA muscle are not sharply demarcated and are distributed along the whole muscle by staining longitudinal cryosections for cholinesterase (7 (link)). Despite the staining motor point demarcation, other descriptions, using an electrophysiological analysis, found the main motor point located at the proximal third of the TA muscle belly (8 (link)). Botter et al. (9 (link)) found another minor motor point located distally and laterally between the middle and the distal third. The main motor point could be localized by Buchthal et al. (1 (link)) tracing a line between the tibial bone tuberosity at the knee down to a median line between the two malleoli; the limit between the upper and the middle third is the reference point and (2 (link)) tracing a line between the fibular head and the medial malleolus; the limit between the upper and the middle third is the reference point (10 (link)).