11) The erector spinae are the prime movers of back extension and consist of three columns of paired muscles.
12) The external and internal intercostals are the prime movers of respiration.
13) The respiratory diaphragm is the prime mover in inspiration.
14) The common origin for many of the extensor muscles of the forearm is the medial epicondyle of the humerus.
15) The pelvic diaphragm consists of the levator ani, coccygeus, and transverse perineal muscles.
16) Femoral and inguinal hernias both occur below the inguinal ligament.
17) Placing fingers directly anterior to the external acoustic meatus enables palpation of the head of the mandible at the tempomandibular joint.
18) The posterior triangle of the neck is bordered by the sternocleidomastoid, the trapezius, and the clavicle.
19) The triangle of auscultation in the back is bordered by the latissimus dorsi, teres major, and medial border of the scapula.
20) A lever system operating at a mechanical advantage can move a large load a short distance with a small amount of effort.