Chicken Dissection Lecture Notes

Handling the Specimen

  • Exercise caution when interfacing with the chicken leg, as the glove's surface might be compromised.
  • The procedure is similar to handling raw chicken in a kitchen environment.

Overview of the Chicken Leg

  • The chicken leg consists of various parts, including skin and underlying muscle.
  • The skin on the surface has been cut to reveal the muscle underneath.

Organs

  • Skin, individual muscles (like biceps, triceps, latissimus dorsi), and bones are considered organs.

Skin

  • Skin acts as a barrier between the body's internal environment and the external environment.
  • It is mostly impermeable, preventing bacteria from entering unless there is a cut.
  • It protects against pathogens like viruses, fungi, and bacteria, provided it remains intact.
  • Skin regulates body temperature through sweating and blood vessel changes.

Tissue Composition of Skin

  • Organs consist of multiple parts (tissues).
  • Skin comprises approximately 10 tissues, with three being examined.

Tissues of the Skin

  1. Stratified Squamous Epithelial Tissue

    • Located on the outer surface of the skin and serves a protective function.
    • Composed of numerous cells that prevent bacterial penetration.

  2. Areolar Tissue

    • Connects the skin to underlying tissues (muscle).
    • Fragile and easily torn.

  3. Adipose Connective Tissue

    • Fat tissue found beneath the skin that stores energy.
    • Appears yellowish and slimy.

Muscle Examination

  • After skin removal, a shiny surface is visible on the muscle, which consist of dense irregular connective tissue.
  • This tissue protects and holds the muscles together.

Muscle Groups

  • Muscles in the body, such as biceps and triceps in the arms or quadriceps and hamstrings in the legs, are organized in groups.

  • Individual muscles are covered by dense irregular connective tissue, separating them from adjacent muscles.

Parts of the Muscle Organ

  1. Dense Irregular Connective Tissue

    • A shiny outer layer that covers and protects each muscle. Separates adjacent muscles.

  2. Individual Muscles

    • Each muscle is an organ, with varying shapes and sizes.
    • Attached to bones by tendons.

  3. Tendons

    • Connect muscles to bones.
    • White and string-like structures, found at both ends of the muscle.
    • Composed of dense regular connective tissue.

  4. Skeletal Muscle Tissue

    • Term for muscle when attached to bone.

Bone Examination

  • Bones, like other organs, are made of tissues, which in turn are made of cells.

Bone Structures

  1. Compact Osseous Connective Tissue

    • The hard outer part of the bone.

  2. Hyaline Cartilage Connective Tissue

    • Smooth, white tissue found at the ends of bones within joints.
    • Facilitates nearly frictionless joint movement.
    • Hard and smooth like glass.

  3. Bone Marrow

    • Located inside the bone.
    • Reddish in chickens and children (yellow in adults).
    • Composed of blood connective tissue and adipose connective tissue.
    • Where blood cells are born and supplied with fat for energy.

Review of Tissues and Organs

  • The chicken leg contains at least three organs: skin, muscle, and bone.
  • Each organ comprises multiple tissues.

Summary of Tissues Found in Each Organ

  1. Skin

    • Stratified squamous epithelial tissue (outer protective layer).
    • Areolar connective tissue (connects skin to muscle).
    • Adipose connective tissue (fat).

  2. Muscle

    • Skeletal muscle tissue
    • Dense irregular connective tissue (covering)
    • Dense regular connective tissue (tendons)

  3. Bone

    • Compact osseous connective tissue (hard outer surface).
    • Hyaline cartilage connective tissue (at the ends).
    • Blood and adipose connective tissue (in the marrow).