Ultrasound of the tibialis anterior muscle

These are axial (left) and sagittal (right) images of the tibialis anterior muscle. Note the distinction of the muscle from the thin layer of subcutaneous tissue marked by arrows. The aponeurosis (A) stands out from the rest of the muscle in both images. The sagittal image (right) shows the bipennate attachments of the muscle fibrous tissue, which joins the aponeurosis at a distinct angle of pennation. The bone edge above the tibia (T) is bright and crisply defined.