muscle activity during relaxed standing

Question 1

muscles active during relaxed standing

Answer 1

postural muscles

soleus

iliopsoas

thoracic paraspinals

neck and head extensors

Question 2

soleus

Answer 2

LOG falls anterior to ankle joint and causes a dorsiflexion movement

–> counteracted by soleus

Question 3

iliopsoas

Answer 3

LOG falls posterior to hip joint and causes extension moment

counteracted by iliopsoas

Question 4

thoracic paraspinals

Answer 4

erector spinae

LOG falls through the cervico-thoracic and thoraco-lumbar junction but is anterior to the thoracic kyphosis

causes a flexion moment

must be counteracted by the thoracic paraspinals

Question 5

neck and head extensors

Answer 5

LOG falls anterior to axis for flexion/extension and causes a flexion movement

counteracted by the neck and head extensors but also by the
—>ligamentum nuchae by the tectorial membrane
—>the posterior aspect of the facet joint capsules
—>the posterior fibers of the anulus