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Fetal Pig Dissection Guide

Nov 20, 2024

Fetal Pig Dissection Lecture

Dissection Equipment

  • Dissecting Tray: For laying the specimen.
  • Scalpel: Used for initial cuts.
  • Probes: Blunt and fine for manipulation, not opening.
  • Forceps (Tweezers): For handling.
  • Dissecting Scissors: One or two pairs for deeper cuts.

Preparatory Steps

  1. Drain Fluid: Cut the bag and drain preservative fluid in the sink.
  2. Position Pig: Slide out the pig, place it on its back in the dissecting tray.

Observing External Anatomy

  • Mammalian Traits:
    • Fur presence.
    • Mammary glands (mammary papillae).
    • Warm-bloodedness (regulate body temperature).

Anatomical Directional Terms

  • Anterior: Towards the head.
  • Posterior: Towards the rear.
  • Dorsal: Backside of the pig.
  • Ventral: Tummy side.
  • Proximal: Close to the body's center.
  • Distal: Further from the center.
  • Left and Right: Refers to the pig's, not the dissector's.

Identifying Sex

  • Bag Label: Indicates male or female.
  • Umbilical Cord: Used for orientation.
  • Male: Urogenital opening near the umbilical cord.
  • Female: Urogenital opening above the anus.

Securing the Pig for Dissection

  • Use twine to tie the pig's legs to the tray.
  • Ensure a taut position for effective access.
  • Be prepared for potential bone fractures during manipulation.

Dissection Procedure

Initial Cuts

  1. Start Under Chin: Extend down towards the umbilical cord.
  2. Create a Flap: Cut around both sides of the umbilical cord.
  3. Tent the Skin: Use forceps and scalpel to make initial cuts.

Body Cavity Access

  • Using Scissors: Switch to scissors after initial scalpel cuts.
  • Avoiding Organ Damage: Cut deeper gradually; scissors are safer.

Handling Rib Cage

  • Thick Scissors for Bones: Cut through ribs to access thoracic cavity.
  • Diaphragm: Cut to access thoracic cavity, helps in breathing.

Cleaning and Care

  • Fluid Management: Use paper towels to absorb fluids.
  • Tissue Removal: Be cautious, respect the former living state of the specimen.

Exposing Organs

  • Abdominal Cavity: Major organs visible, may require further cuts for reproductive organs.
  • Thoracic Cavity: Requires rib removal for access.

Identifying Key Structures

  • Larynx and Trachea: Landmark identification for further exploration.
  • Heart and Pericardial Sac: Carefully expose the heart.

Examination Tips

  • Be respectful and mindful of former living state.
  • Handle organs delicately, avoid unnecessary removal.
  • Be aware of formaldehyde exposure; dispose tissues properly.

Safety and Comfort

  • Use caution with sharp instruments.
  • Manage discomfort sensitively, take breaks if necessary.

Conclusion

  • Dissection is an educational tool; treat the procedure with respect and care. Prepare for the pig dissection in your upcoming class.

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