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Uterine Horns

In cats and many animals that have multiple embryos, the uterus is divided into two sides called the uterine horns.  The ovary can be found at the end of each horn.  In humans, this structure is homologous to the Fallopian Tubes.  The photo below shows only the right …

Renal Pyramid

Renal pyramids are triangular shaped areas seen on a cross section of the kidney.  They appear striped due to the thousands of nephrons within them that make up the functional unit of the kidney.  The nephrons perform the function of filtration of waste products from the blood and …

Skeleton Practical

Many anatomy instructors will include a lab practical with investigations of anatomy.  This is a lab practical given to the class of 2014 over the bones of the human.   Practice by naming the parts, the last photo reveals the answers.  The test I give is different every …

Common Carotid Arteries

The carotid arteries supply blood to the head and neck.  In humans, the right common carotid branches from the brachiocephalic artery and the left common carotid branches directly from the arch of the aorta.   On the cat, as shown in the photograph, both common carotids branch from the …

Chordae Tendinae

The chordae tendinae are tiny tendons that connect the valves of the heart to the papillary muscle.  They appear as small white strings and are sometimes referred to as the “heart strings.”  In the photo below the right ventricle has been cut and the chordae shown are attached to …

Quiz: Veins of the Head and Neck

    1  = Superficial Temporal Vein 2 = Occipital Vein 3 = External Jugular 4 = Vertebral Vein 5 = Axillary (Also the subclavian where it branches from the brachiocephalic) * 6 = Facial Vein 7 = Internal Jugular 8 = Brachiocephalic *The superior vena cava (not shown) …

Larynx and Trachea

The larynx is also known as the voice box and it can easily be found in the throat of mammal specimens (fetal pig shown below.)  The larynx contains the vocal cords that are used for making sounds.  In humans the location of the larynx allows for diverse sounds …

Mitral (or Bicuspid) Valve

The bicuspid and tricuspid valves are both located between the atrium and the ventricle.   They are similar in appearance and can be difficult for beginning anatomists to identify accurately.  There are a couple of different ways to remember and then locate the valves.  First, you must remember …

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 …

Video of a Brain Dissection

This video shows the major parts of the brain, starting with the external anatomy where the pituitary gland, optic chiasma (nerves) , olfactory lobes, dura mater, and the parts of the brain stem:  midbrain, pons, medulla, and spinal cord.   The brain is the cut along the longitudinal …