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Urinary Bladder

The urinary bladder collects urine excreted by the kidneys.  It is a hollow, expandable structure located in the lower abdomen.   The photo below shows the urinary bladder of a sheep.  The bladder is the balloon-like structure in the upper right area of the tray.   It

Eye Dissection

Procedural video showing how to dissect the eye and identify the major structures such as the lens, iris, pupil, vitreous humor, retina, optic disk, optic nerve. and tapetum.  Unlike humans, cows have a reflective surface on the back of their eye which enables them to see in

Eye – Vitreous Humor

The vitreous humor is the clear gel that fills the space between the lens and the retina.  On the cow eye, this can usually be removed in a single clump of thick liquid, unlike the aqueous humor which is thin and watery. Most eye floaters are caused

Label the Parts of the Ear

1. Auricle 2. External Auditory Meatus 3. Tympanic Membrane 4.  Tympanic Cavity 5.  Round Window 6.  Eustachian Tube 7.  Cochlea 8.  Vestibulocochlear nerve 9.  Semicircular canals 10.  Stapes 12.  Incus 13.  Malleus 15. Outer Ear 16. Middle Ear 17.  Inner Ear

Brain – Pituitary Gland

The pituitary gland, also called the hypophysis, is associated with the endocrine system.  It it located on the ventral side of the brain attached to the hypothalamus.   Under the direction of the brain, the pituitary gland controls the secretion of hormones that regulate growth, blood pressure,

Brain – Brain Stem

The brain stem is the posterior section of the brain that includes the pons and the medulla oblongata, which is continuous with the spinal cord.  The midbrain is usually included as part of the brain stem and includes the corpora quadrigemina (shown partially on the photo as

Brain – Optic Chiasma

On the ventral side of the sheep’s brain, several nerves and structures are visible after the careful removal of the dura mater.   The image below shows the brain with the dura intact and the eye socket attached.  The blue reflective surface of the sheep tapetum can

Cat Muscles – Trapezius

In the cat, the trapezius muscle is divided into three flat muscles that cover the upper back and the neck.  The most anterior of these muscles is the clavotrapezius, named for its insertion into the clavicle. The middle trapezius muscle is the acromiotrapezius, which covers the scapula

Brain – Corpus Callosum and Ventricles

This bisected brain shows the major features of the midbrain and brain stem.  The corpus callosum is just been the cortex of the brain and connects the left and right hemispheres.    The lateral ventricle is a fluid filled space found below the corpus callosum and just

Brain – Transverse Fissure

The cerebrum and cerebellum of the brain are divided by the transverse fissure.   The left and right hemispheres of the brain are divided by the longitudinal fissure. A fissure is a groove or a natural division, and with the brain are divide major regions. Sulci (singular: