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It is still the agonist, because while resisting gravity during relaxing, the triceps brachii continues to be the prime mover, or controller, of the joint action. Another example is the dumb-bell curl at the elbow. The elbow flexor group is the agonist, shortening during the lifting phase (elbow flexion). During the lowering phase the elbow ...
When all its fibers contract simultaneously, the deltoid is the prime mover of arm abduction along the frontal plane. The arm must be medially rotated for the deltoid to have maximum effect. [13] This makes the deltoid an antagonist muscle of the pectoralis major and latissimus dorsi during arm adduction.
Prime mover (engine or motor), a machine that converts various other forms of energy (chemical, electrical, fluid pressure/flow, etc.) into energy of movement Prime mover (locomotive) , one of the several types of power plants used in locomotives to provide traction power
The iliopsoas is the prime mover of hip flexion, and is the strongest of the hip flexors (others are rectus femoris, sartorius, and tensor fasciae latae). [3] The iliopsoas is important for standing, walking, and running. [2] The iliacus and psoas major perform different actions when postural changes occur.
An example of this is walking on a slope. The body must resist gravity while moving in a direction, and balancing itself on uneven ground. This forces the body to align the bones in a way that balances the body while at the same time achieving momentum through pushing against the ground in the opposite direction of the desired movement.
Prime mover Origin Insertion Raising eyebrows (e.g., showing surprise) Skin of scalp: Anterior: Occipitofrontalis frontal belly: Epicraneal aponeurosis: Underneath skin of forehead Tensing and retracting scalp: Skin of scalp: Posterior: Occipitofrontalis, occipital belly: Occipital bone; mastoid process (temporal bone) Epicraneal aponeurosis
For example, TA splits the nasalis muscle into transverse and alar parts, so their TA column entries are 2. For Origin, Insertion and Action please name a specific Rib, Thoracic vertebrae or Cervical vertebrae, by using C1-7, T1-12 or R1-12.
The prime mover strategy arises when a muscle's vector can act in the same direction as the mechanical action vector, the vector of the limb's motion. The cooperation strategy, however, takes place when no muscle can act directly in the vector direction of the mechanical action resulting in a coordination of multiple muscles to achieve the task.