To start off in the position you will have cervical extension to be able to watch what is going on with the pitcher and also people on base at all times. The most important muscles in cervical extension would be trapezius, levator scapula, splenius capitis, splenius cervicis, rectus capitis posterior major, recuts capitis posterior minor, …show more content…
Trunk flexion is huge when it comes to the strike zone and the comfort of the catcher in that position. The five most important muscles that help with trunk flexion are rectus abdominis, external oblique, internal oblique, psoas major, and illiacus. Rectus abdominis origin is at the pubic crest and the pubic symphysis. The insertion is at the cartilage of the fifth, sixth and seventh ribs and xiphoid process. External oblique’s origin is the external surfaces of the fifth and twelfth ribs. Its insertion is at the anterior part of the iliac crest and the abdominal aponeurosis to linea alba. The internal oblique’s origin is the lateral inguinal ligament, the iliac crest and the thoracolumbar fascia. Its insertion is on the internal surface of the lower three ribs and the abdominal aponeurosis to linea alba. These muscles flex the vertebral column. Psoas major origin is at the bodies and transverse process of the lumbar vertebrae. The insertion is at the lesser trochanter. The illiacus origin is the iliac fossa and the insertion is at the lesser trochanter. These muscles flex the trunk toward the thigh. The muscles that are relaxed during the movement of the trunk flexion are longissimus, illiocostalis, multifidi, rotatores, semispinalis capitis, spinalis, interspinalis, and intertransversarii. Multifidi, rotatores, semispinalis capitis, interspinalis, and intertransversarii were mentioned earlier in this analysis. Origin, insertion and action stay the same in this movement as well as in cervical extension. Longissimus’s origin is at the tranverse processes of the upper five thoracic vertebrae. Its insertion is at the lower nine ribs and the transverse processes of the thoracic vertebrae. The origin of the illiocostalis is the posterior surface of ribs one through twelve. The insertion is at the posterior surface of ribs one through six. The spinalis origin is at