Search results
Results From The WOW.Com Content Network
Adducts, extends and internally rotates the arm when the insertion is moved towards the origin. When observing the muscle action of the origin towards the insertion, the lats are a very powerful rotator of the trunk. Antagonist: Deltoid and trapezius muscle
Rectilinear motion is motion in a straight line between two points, whereas curvilinear motion is motion following a curved path. [2] Angular motions (or rotary motions) occur when an object is around another object increasing or decreasing the angle. The different parts of the object do not move the same distance.
Medial rotation of the arm is most easily observed when the elbow is held at a 90-degree angle and the fingers are extended so they are parallel to the ground. Medial rotation occurs when the arm is rotated at the shoulder so that the fingers change from pointing straight forward to pointing across the body.
Muscles which attach to the scapulae that adduct and extend the arm include the posterior deltoid muscles, the teres major, and minor stabilizing contribution from some rotator cuff muscles (infraspinatus and teres minor as lateral rotators, subscapularis as medial rotators).
flexes knee, extends hip, medially rotates leg at knee [11] quadriceps femoris: 2 1 gracilis: Lower limb, Thigh/Hip, Medial compartment (adductor muscles) inferior pubic ramus [12] tibia (pes anserinus) obturator artery: anterior branch of obturator nerve [12] adducts hip, flexes hip, medially rotates knee [12] gluteus medius, gluteus minimus ...
Secondly, it adducts the humerus, as when flapping the arms. Thirdly, it rotates the humerus medially, as occurs when arm-wrestling. Fourthly the pectoralis major is also responsible for keeping the arm attached to the trunk of the body. [7] [8] It has two different parts which are responsible for different actions.
The first 10° is performed entirely by the supraspinatus, but beyond that fibres of the much stronger deltoid are in position to take over the work until 90°. To achieve the full 180° range of abduction the arm must be rotated medially and the scapula most be rotated about itself to direct the glenoid cavity upward. [7] Muscles
The extensor carpi ulnaris extends the wrist, but when acting alone inclines the hand toward the ulnar side; by its continued action it extends the elbow-joint. The muscle is a minor extensor of the carpus in carnivores, but has become a flexor in ungulates. In this case it would be described as ulnaris lateralis.