extrinsic foot muscles origin insertions

One example is raising the body on the toes. Most authorities agree that there are very few examples of Levers have the fulcrum at one end, the effort at the opposite end, and the The contraction of the muscles of theīack is the effort. (Atlanto-occipital joint) is the fulcrum. The joint between the atlas and occipital bone When the head is raised, the facial portion of the skull is There are not manyįirst-class levers in the body. An example of a first-class lever is a seesaw.

1.1.3.4.2 First-classįirst-class levers, the fulcrum is between the effort and resistance. 1.1.3.4 Levers 1.1.3.4.1 Levers areĬategorized into three types according to t he positions of the fulcrum, theĮffort, and the resistance. The force of contraction of the biceps brachii pulling the forearm up is theĮffort. The weight of theįorearm plus the weight in the hand is the resistance. When the forearm is raised, the elbow is the fulcrum. Muscle and produces motion if the effort exceeds the resistance (load).Ĭonsider the biceps brachii flexing the forearm at the elbow as a weight is

Muscular effort (contraction) is applied to the bone at the insertion of the Resistance may be the weight of a part of the body that is to be moved. Is the force exerted to overcome the resistance. Resistance may be regarded as a force (load) to be overcome, whereas the effort A lever isĪcted on at two different points by two different forces: the resistance R and A lever may be defined as a rigid rod that moves about on someįixed point called a fulcrum. Producing a body movement, bones act as levers and joints function as fulcrums of

Extrinsic foot muscles origin insertions