Annotating the Human Elbow
- The human elbow is an articulated synovial joint which means that it is a junction where two moving bones meet encapsulated in synovial fluid
- It consists of several components which can be labelled on a diagram and annotated with descriptions of each structure in the following way:
The human elbow joint
Drawing a Sarcomere
- An accurate drawing of the sarcomere is a good way to demonstrate the relative movement of the muscle fibres during muscle contraction
- It also allows us to understand the visible bands seen in the images of muscle tissue in micrographs
- Some important considerations are as follows:
- Z-lines mark either end of a sarcomere
- Actin must be adjoined clearly to the z-lines and is thinner than the myosin
- Myosin should be shown with the crossheads visible and should be thicker than actin
- Light bands (around the z line) and dark bands (where the 2 filament types overlap) should be labelled
The sarcomere
