Skeletal muscles

• Bicep femoris causes flexion at the knee.
• Rectus femoris causes extension at the knee.
• The recuts femoris is the antagonist of the knee during flexion.
• The bicep femoris is the antagonist of the knee during extension.
• Gluteus maximus is the fixator during flexion at the knee.
• Illiopsoas is the fixator during extension at the knee.
• The tibialis anterior is the agonist during plantar flexion.
• The gastrocnemius and soleus causes dorsi flexion.
• The tibialis anterior is the antagonist during dorsi flexion.
• The gastrocnemius and soleus are antagonists during plantar flexion.
• The bicep brachi causes flexion of the elbow.
• The tricep brachi causes extension at the elbow.
• The deltoid is the fixator for movement at the elbow.
• The bicep brachi is the antagonist during extension of the elbow.
• The tricep brachi is the antagonist during flexion of the elbow.
• The wrist joint is a condyloid.
• The ankle joint is a hinge joint.
• The wrist flexors cause flexion of the wrist.
• Wrist extensors cause extension at the wrist.
• Flexion at the shoulder is caused by the anterior deltoid.
• The posterior deltoid is the antagonist of the shoulder during flexion.
• The trapezius is the fixator during most movements of the shoulder.
• Extension of the shoulder is caused by the posterior deltoid.
• Abduction of the shoulder is caused by the medial deltoid.
• The latissimus dorsi is the antagonist of the shoulder during abduction.
• Latissimus dorsi causes adduction at the shoulder.
• The medial deltoid is the antagonist during extension at the shoulder.
• Pectorialis major causes horizontal flexion at the shoulder.
• Teres minor is the antagonist during horizontal flexion of the shoulder.
• Teres minor causes horizontal extension at the shoulder.
• The pectorialis major is the antagonist during horizontal extension at the shoulder.
• Inferior: bottom half of the body
• Superior: upper half of the body
• Medial: rorating towards the middle of the body.
• Lateral: rotating away from the midline of the body.
• Anterior: front of the body.
• Posterior: back of the body
• During medial rotation teres minor and subscapularis are the agonists.
• Infraspinartis and retest minor are agonists during lateral rotation
• The illiopsoas is the agonist during flexion of the hip