10/03/2018
*A chicken drumstick and thigh are similar in construction to the human leg.
Aim:
In this dissection, you will locate and describe the various tissues and the structures of the drumstick and thigh of a chicken.
Material:
Chicken drumstick with thigh
dissecting probe
Scalpel
dissecting scissors
paper towels
forceps
dissecting tray
gloves
disinfectant hand wash and spray.
Safety:
1} Wear gloves
2} Do not put anything in your mouth{fingers, pens, etc} during the dissection.
3} Wash your hands thoroughly at the end of the dissection with antibacterial soap and hot water. Ensure your hands are dried after washing.
4} Spray surfaces with antibacterial soap.
Method/Procedure:
1} place the chicken leg on a dissecting tray and examine{look at}the exterior features. The tough outer layer is called the epidermis{or skin}. The small bumps covering the skin are where the feathers were attached.
2}Examine the lower leg. This is called the drumstick and it is equivalent{same as} of your lower leg. The large muscle at the back of the leg is the same as your gastrocnemius. It also includes two bones-the tibia{the large one} and fibula{the thinner, smaller one}.
3} Examine the upper leg. On both a chicken and a human this part is called the thigh. It contains a large bone called the femur.
4} Carefully pull the skin off sliding it down and off the lower leg. You may need to use your scalpel to remove it, but be careful not to cut any muscle tissues.
5} The yellowish material under the skin is fat{adipose}.
{Q} a} Outline the function of adipose tissue.
Insulation {keeps us warm} energy.
{Q} b} Is there more adipose tissues in the thigh or the drumstick?
Thigh
6} The muscles of the leg, like all muscles work in bundles. Separate a bundle pf muscle by inserting your thumb into the muscle of the lower leg. You will notice that the muscle bundle is covered is a silvery lining called the fascia and this makes it harder to separate. But if you push hard enough you will tear it and find that separating muscles bundles is a lot easier.
7} At either end of the muscles, you will see white cord-like tissues. These cords are called tendons. Tendons attach muscle to bone.
8} Using the scalpel, carefully remove all the muscles from the lower leg. Using your dissection probe to examine any blood vessels you find and try to determine which muscles the blood is supplied to.
9} Near the bone you should see thin, thread-like strands. These are the nerves.
10} Using the dissection scissors, cut across the tendons that join the muscles to the bones. Be careful not to cut any ligaments that attach bone to bone . You should end up with all the bones still attached to each other, but no muscle tissue present.
11} Move the bones around the joints. The main joint between the bones of the lower leg and the femur is a hinge joint like the one in your knee. Note how the bones can move only in one plane.
12} Using your scalpel, carefully cut the ligaments, keeping the bones together.
13} In the joint between the bones is a piece of cartilage. Cartilage allows joints to move smoothly and protects the bones against shocks to the body.
14} Break one bone in half examine the marrow. This is where blood cells are made.
15} Clean up your work area. Ensure you clean your bench using antibacterial spray. Wash you hands thoroughly with plenty of antibacterial soap and water.
{Q} Observations:
That we found where the muscles, tendons and bones also we saw where the blood vessels supplies their blood, also how similar it is to human lower leg.
We mostly have adipose{fat} under our skin to keep us warm which we have a lot of.
