Chicken Dissection Lab

03/21/16

1. During this lab we dissected a full chicken. We were primarily examining the different muscle groups in the chicken. We saw how the different muscles and tendons interact. We also examined the type of movement the muscle allows for the chicken. Movement is allowed by the muscles as the muscles connect to the bones of the chicken. These muscles are connected to the bones via tendons. When the muscle contracts the bird is able to move its body one way and when the muscle relaxes it can move the other way. One example of this is the pectoralis major. When this muscle contracts it allows the birds wings to flap downward and when it relaxes the wings return to its original position. An origin is a fixed attachment of the muscle, while the tendon of insertion moves as the muscle contracts or relaxes. One muscle in the chicken that is similar to humans is the bicep brachii. Both muscles allow the arm to flex or extend via contraction and relaxation. Another muscle is the pectoralis. Both species have this muscle however, in the chicken it is one of the largest muscles in the body. This is primarily due to the breeding the chickens undergo for large breasts. The last muscle is the latisimus dorsi. However, in the chicken this muscle is extremely small, again resulting from the process the chickens are bread from.

Semimembranosus: Responsible for the flexion of the leg
Semitendinosus: Responsible for flexion of knee extension of hip

Biceps Femoris: Helps with the flexion of the knee

Quadriceps Femoris: Plays large role in running, and jumping

Biceps Brachii: Responsible for flexion of arm
Tracips Humeralis: Responsible for extension arm
 Deltoid: Causes the rotation of the arm 

Brachioradialis: helps flex the elbow and aids in supination
Flexor carpi ulnaris: responsible for abduction of the hand

Trapezius: moves the scapulae and supports the arm
Latisimus dorsi: responsible for extensions, abduction, rotation, and flexion of the shoulder joing

Pectoralis Major: Responsible for the flapping down of the wings
Pectoralis Minor: responsible for bringing the wings back up

Iliotibalis: Splits into superficial deep layers, and anchors into the thigh
Sartorius: Is the longest muscle in the body, rotates the thigh at the hip joint

Tibialis Anterior: functions to lock the ankle, toe-kicking

Gastrocnemuis: responsible for plantar flexing of the foot