Increase in vastus lateralis aponeurosis width induced by resistance training: implications for a hypertrophic model of
pennate muscle. Eur J Appl Physiol.
The PM is a broad
pennate muscle that lies on the anterior aspect of the chest wall with no consistent anatomic description in the literature.
In
pennate muscle, changes in muscle size may also depend upon changes in fibre pennation angle which becomes greater (more perpendicular to the tendon) during contraction.
By design, the total capacity for tension development is enhanced in
pennate muscle by having more sarcomeres arranged in parallel and fewer in series within a given volume of muscle.