Category: Anatomy

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Vitreous Humor of the Eye

This dissected eye shows the clear gel that fill the space between the lens and the retina of the eye.  In a preserved specimen, the fluid is cloudy and thick, having the consistency of gelatin.  When the eye is cut in half, the lens can be found floating …

Rat Dissection

Students in biology are often tasked with dissecting a frog, but there are many other vertebrate models that can provide a rich experience in learning anatomy.   Common specimens include the fetal pig, shark, mink, cat, and the rat.   Rats are fairly inexpensive and are raised for …

Heart – Systole and Diastole

During the cardiac cycle, two contractions occur.  Systole occurs when the muscles contract and diastole occurs when the muscles relax.   Atrial systole occurs when the atria contract and push blood into the lower ventricles.  During this point, the aortic valve is closed.   Ventricular contraction then occurs …

Cerebellum and Arbor Vitae

The cerebellum is located at the posterior end of the brain and is associated with motor control, balance and coordination.  It is only loosely attached to the cerebrum, and dissections of the brain reveal that removing the dura mater often result in the accidental removal of the cerebellum. …

Muscles of the Leg (Human)

The thigh muscles are often collectively called the quadriceps, which consist of four separate muscles:  rectus femoris, vastus lateralis, vastus medialis, and the vastus intermedius.  On most diagrams, the rectus femoris is shown as the front muscle that runs parallel to the femur.   The word “rectus” means …