Mammalian Organs
Heart
Human Heart Model
- External structures
- The right atrium and right ventricle have been opened. The right atrioventricular and semilunar valves can be seen.
- The left atrium and ventricle have been opened. The left atrioventricular and semilunar valves can be seen.
Sheep Heart
After exploring the heart model (above) obtain a sheep heart that has been previously cut to reveal the internal structures. If it has not been cut already, you must first remove the pericardial membrane surrounding the heart. Next, insert scissors into the superior vena cava and cut through the right atrium and right ventricle to the apex of the heart. Next, insert the scissors into the left atrium and cut through the left atrium and ventricle to meet your previous cut at the apex. As you open the heart, you will need to insert a scalpel and cut tissue holding the two halves together.
Identify these structures.
Aortic arch
Pulmonary trunk
Left ventricle
Right ventricle
Superior vena cava
Inferior vena cava
Right atrioventricular valve (tricuspid)
Left atrioventricular valve (mitral)
Chordae tendineae
Semilunar valves
Sheep Brain
Obtain a sheep brain and note the following structures.
spinal cord
medulla oblongata
pons
cerebelllum
optic chiasma
Olfactory bulb
Cerebrum
Cut the brain in half so that each half so that a left and right half are produced. Identify the following structures.
Cerebrum
Cerebellum
Corpus callosum
Optic chaisma
Midbrain
Pons
Medulla oblongata
Spinal cord
Sheep Kidney
Cut a sheep kidney lengthwise and identify the following structures.
Cortex
Medulla
Renal pyramid
Renal pelvis
Ureters
Sheep Eye
Cut a sheep eye in half so that the anterior half containing the cornea is separate from the posterior half that contains the retina and optic nerve. This can be done by cutting a hole in the side of the eye and then using scissors to cut completely around the eye. Identify the following structues.
Optic nerve
Retina
Choroid
Sclera
Lens
Ciliary muscle
Cornea
Iris
pupil