Fine structure of myotendinous junction between the anterior belly of the digastric muscle and intermediate tendon in adults rats

► The ultrastructural characteristics of myotendinous junction, its morphology and collagen fibers interaction with muscle cell. ► The close relationship of the myofibrils bundles with the lateral junctions. ► The collagen fiber bundles form the microtendons. ► Sarcoplasmic projections denominated finger-like process interspersed by interdigitations, and atypical regions showing sub-specializations between myofibrils bundles.