When the skin is removed identify
the muscles of the wing and and determine how each one is attached to the
skeleton.
Run the forceps along the length
of each muscle until you reach the tendon. The tendon
is the white, tough, fibrous material that connects the muscle to the bone.
The tendons connecting muscle and bone can be seen in several muscle groups.
Where these tendons run over joints, like the elbow, they are often in well
developed sheathes. Such a sheath can be seen on the right. Do such sheathes
exist in the Human elbow?
Notice where each muscle
is connected to the bone.
Squeeze a muscle and notice
how the bones move. Click to see a 200 kb
video. Muscle exist in pairs called flexors, which flex the wing,
and extensors, which extend the wing.
At the surface of each bone
forming the joint is a white, shiny, slippery substance called cartilage.
Look at a the
bones of the human hand. Identify the humerus, ulna and radius.
Compare the similar features between the chicken wing and the human
hand.
The chicken wing and the human hand are very similar. It clearly shows evolutionary links. Match the chicken wing parts shown on the diagram below with the equivalent human part.
Part B
Part C
Part D
Part E
Part F
Part G
The human arm and the chicken wing have are homologous structures. Explain what homologous structures are with reference to the chicken wing and Human arm.
The chicken wing and Human arm is an example of
? Explain
The chicken wing is useless for what it was intended for, flying. What term best describes this structure?
Which two terms best describe the chicken wing?
and
Which two terms go together
and
Why is the similarity between the structure of the Human arm and the chicken wing evidence for evolution?
Consider the animation on the right. It shows a student pulling on a tendon on the chicken wing.
Explain what this type of lever system is designed to do.
What type of lever system is it?
Give an explanation as to why this lever system has evolved over other types of lever systems.
