Chicken Dissection Analysis

1. Initially, we skinned the chicken in order to gain a better perspective of the muscles, bones, and tendons. With the muscle, its main role in the movement of the body is helping stabilize joints as well as maintains postures and body position. Specifically, the pectoralis major muscle allows for the adduction of the chickens wings. Bones provide the organism with structure, which allows for movement. Lastly, tendons, which are a cord of dense regular connective tissue composed of collagen, attaches muscle to periosteum to bone, which allows the organism to function and move in its daily life. For example, within the chickens wing, the tendons attached to the brachioradialis allowed movement and stretching in the muscle to keep it from tearing.

As for the tendon of the insertion, it allowed for much more range of motion for the chicken, rather than the tendon of the origin, which has a smaller range of motion and depends on the synovial joints for movement.  As for physical differences, the tendon of the insertion was smaller, smoother, and shinier than the tendon of the orgin- which was thicker and less shiny. Compared to a human, the chicken has similar biceps and triceps-even though the muscles were on a smaller scale- they were easily identified. Continuing with similarities, the pectoralis major and minor both allow for the adduction and abduction of the arms or wings, and as for the size, of each they are proportional to the roles played in the movement of the arms. However, not all the muscles in the chicken are similar to that of a humans. However, even though the pectoralis major and minor are proportional to the body of the chicken, they are much more elongated protrude more than that of a human.

2.

This muscle pulls the wing ventrally,
which allows for flight in the chicken.

The pectoralis muscle in the chicken
allows for the abduction of the wings.

The tricep in the bird allows for extension
of the wing. 

The trapezius muscle in the bird
is perpendicular from the backbone
to the shoulder and pulls the
shoulder back.

In the bicep femoris, it helps the chicken
power running as well as flexes the leg.

The gastrocnemius muscle attaches
to the Achilles tendon around the hock
of the bird, extends the foot, and flexes
the lower leg.

The brachioradialis runs from the elbow to the thumb side of the hand, and this muscle pulls the hand back.

The flexor carpi ulnaris muscle runs
from the back of the elbow to the
"pinky finger" side of
the hand and allows the
hand to flex. 

The sartorius muscle allows for the
flexing of the thigh and allows
for the legs to cross.

The chicken leg thigh includes the sartorius, iliotibialis,
biceps femoris,
semimembranosus, semitendinosus,
and the quadriceps femoris.

The quadriceps femoris allows the chicken
to flex the thigh and extends the lower part of the leg.

The iliotibialis muscle covers the
lateral side of the thigh in birds, and extends
the thigh and flexes the leg.

The tendons are the shiny ends of the muscle
that attach the muscle to the bone.

                                                                                                                                                                                                        

The semimembranosus muscle defines the
caudal edge of the thigh as well as extends the thigh.

The semitendinosus muscle is on the inner part of the
thigh and extends the thigh.