Anatomy: Unit 1 Introduction--Rat Dissection

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Anatomy: Unit 1 Introduction--Rat Dissection

  1. 1. ANATOMY Unit 1 Notes: Rat Dissections
  2. 2. (1) Organs To Know • Heart • Lungs • Diaphragm • Stomach • Liver • Small Intestine • Large Intestine • Kidneys
  3. 3. (2) Initial Incisions 1. Lie rat on its back. 2. Press down on limbs to open up chest + belly. 3. Make 2 horizontal incisions: - (1) Directly below throat - (1) Directly above crotch 4. Make 1 vertical incision: - From throat  crotch - Pull up on skin + muscle to avoid cutting internal organs.
  4. 4. (3) Organs In The Chest Cavity • Ribs: Bones covering heart and lungs. • Heart: Looks like red-brown nugget in center of chest. • Lungs: – Look like brown lobes/flaps. – 1 Lung on either side of heart. • Diaphragm: – Looks like a thin, smooth piece of muscle. – Directly under ribcage.
  5. 5. (4) Organs In The Abdomen • Liver: – Largest internal organ. – On rat’s right side / On your left side. – Large, hard, brown, lobed organ. – Directly underneath diaphragm. • Stomach: – On rat’s left side / On your right side. – J-Shaped, squishy sac. – Directly underneath diaphragm. • Small Intestine: – Flesh colored, squiggly tube. – Small = Thin in diameter. – Middle of abdomen, connecting to stomach. • Large Intestine: – Flesh colored, squiggly tube. – Large = Thick in diameter. – Middle of abdomen, connecting to anus.
  6. 6. (5) Organs Along The Back • Kidneys: – Look like kidney beans. – Red-brown color. – Must remove all other digestive organs first. – Lie along lower back, 1 on each side.
  7. 7. Yes you need to draw this!!
  8. 8. (6) Basic Organ Function • Heart: Pump blood + circulate nutrients. • Lungs: Bring in oxygen + expel carbon dioxide. • Diaphragm: Help lungs fill with air. • Stomach: Metabolize food. • Small Intestines: Absorb nutrients from food. • Large Intestine: Expel food waste. • Liver: Break down bad blood cells + toxins. • Kidneys: Filter blood.

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