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Sheep's Brain and Eyeball Dissection Report

ANP 101 Susie Ditsworth
by Susie Ditsworth on 9 December 2012

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Transcript of Sheep's Brain and Eyeball Dissection Report

by Susie Ditsworth Sheep Brain & Eye
Dissection Report Introduction The sheep's brain and eye are used in the study of human anatomy because they are structurally similar to that of a human specimen. The dissection of a sheep's brain and eye is useful in understanding the composition of the human brain. Mammalian brains are very similar in structure and function. Hypothesis The sheep's brain and eye will be structurally similar to a human specimen. Methods Results Discussion Left Cerebellum Right Cerebellum Spinal Cord Pituitary Gland Optic Chiasma Olfactory Bulb Parietal lobe Hypothalmus Commisures Corpus Calosum Pineal Body Trapezoid Body Fourth Ventricle Third ventricle Cerebral Aqueduct Frontal lobe Longitudinal Cerebral Fissure Sulcus Gyrus Temporal lobe Occipital lobe Medulla Oblongata Arbor Vitae Sheep's Eye Before fat and connective tissue removed After fat and connective tissue removed lens pupil retina vitreous iris cornea Superior View Posterior View Inferior View Sclera Cross sectional view The eye was disected and identification of structures were documented by photography. The brain was disected and identification of structures were documented by photography. Dissection of the sheep's brain was performed after the meninges were removed. An incision was then made along the longitudinal fissure which seperated the brain into the left and right lobes. Disection of the sheep's eye was performed after the adipose and connective tissue was carefully removed to expose the sclera. A incision was then made in the sclera and continued around the circumference of the cornea. Dissection was completed and all structures of the sheep's brain and eye were identified and documented by photography. Pictures of dissections are presented in the following slides. A comparison to the human brain and eye was made. 1. Sheep have a very large pupil that is somewhat rectangular in shape.
2.The eyeball is placed more to the side of the head, which gives sheep a much wider field of vision.
3. With only slight head movement, sheep are able to scan their surroundings. Their field of vision ranges from 191 to 306 degrees, depending upon the amount of wool on their face.
4. Sheep have poor depth perception due to their lack of fovea.. 1. The human brain is heavier and longer than a sheep’s brain.
2. The sheep’s brain has a more developed olfactory bulb when compared to the human brain.
3. The human brain is rounded, whereas the sheep’s brain is elongated in shape.
4. The human brain has a larger frontal lobe than the sheep’s brain.
5. The human brain and sheep brain have the major difference that humans can think, write, invent or create with their brains, whereas sheep cannot. Brain Eye Dissection of a cadaver gives the student a thorough understanding of anatomy. It also makes understanding function more simple due to the familiarity of structures from dissection.
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