Bio Brain Dissection Lab Report by Kayla Arisman on Prezi

 

sheep brain dissection lab report

Blog. 30 August Ace your school projects with these 12 featured Prezi presentations and templates; 30 August 12 featured Prezi presentations and templates for engaging lessons. View Lab Report - A&P 1 - Lab Sheep Brain Dissection from BSC C at Florida State College at Jacksonville. MaureenFiguerrez BSCCHumanAnatomy&Physiology1 ProfessorAlejandroViera 95%(22). See for yourself what the cerebrum, cerebellum, spinal cord, gray and white matter, and other parts of the brain look like with this sheep brain dissection guide! Use this for a high school lab, or just look at the labeled images to get an idea of what the brain looks like. Observation: External Anatomy of Sheep Brain.


Sheep Brain Dissection Guide


Sheep Brain Dissection Lab. Follow the directions within this lab to properly dissect and expose the items on your sheep brain.

The sheep brain is remarkably similar to the human brain. One major difference, however, is in proportion. For example, the sheep brain has a proportionately smaller cerebrum.

Another difference is in orientation of the spinal cord. The sheep spinal cord is orientated anterior to posterior, as in any four-legged animal. The human spinal cord is orientated superior to inferior.

This orientation difference has a major affect on the location of the brain stem. The sheep brain stem is located more towards the rear posteriorly. The sheep skull, in order to compensate for this, has the foramen magnum located more towards the rear of the skull.

In humans, since we walk upright bipedalismthe spinal cord is in a more vertical plane, thus the foramen magnum is located centrally on the bottom of the skull inferiorly. By observing the movement of this major skull feature from the rear as in very early human ancestors to the current location modern humansscientists have been able to determine when the human species began to walk upright on two legs.

Obtain a preserved sheep brain from sheep brain dissection lab report bucket in the front of the classroom. Place this on your dissection tray. You will need the following dissection tools to properly perform this lab:.

The sheep brain is enclosed in a tough outer covering called the dura mater. You can still see some structures on the brain before you remove the dura mater. See the diagrams below to locate the following structures:.

Using your scissors, remove the dura mater from the brain. This will not be as easy as it looks. The dura mater is a very tough membrane, sheep brain dissection lab report. As you cut into the area along the middle of the top portion of the sheep brain dissection lab report, you will see how the dura mater juts downward slightly separating the right and left hemispheres of the cerebrum.

This portion of the dura mater is referred to as the falx cerebri. Within the middle of the falx cerebri you will find a space or opening. This space is called the sagittal sinus. The deep opening that separates the two hemispheres is known as the longitudinal fissure.

See the diagrams below to locate these structures. After removing the dura mater from the cerebrum, carefully remove the dura mater from the cerebellum. Again, you will see a portion of the dura mater jutting down into a fissure that separates the cerebrum area from the cerebellum.

The portion of the dura mater that is found here is called the tentorium cerebelli. The deep opening or fissure that separates the cerebrum from the cerebellum is called the transverse fissue. See the diagrams below to identify these structures. Once you have removed the entire dura mater, you may still be able to see the optic chiasma but the pituitary gland will probably be missing.

Often these two sheep brain dissection lab report are removed with the dura mater, but in this image below they are still intact. If you did not carefully remove the dura mater you may have accidentally pulled the entire cerebellum away from the brain. The lobes of the brain are visible, as well as the transverse fissurewhich separates the cerebrum from the cerebellum.

The convolutions of the brain are also visible as bumps gyri and grooves sulci. Use the diagram below to help you locate these items. The gap between the cerebrum and the cerebellum at the transverse fissure can reveal some internal parts of the brain. Just behind the colliculi, the pineal gland is just barely visible. Sharp scalpels work best for this procedure, sheep brain dissection lab report. Use the picture below as a way to see how your sheep brain should look after you cut it in half.

Once the brain is cut this way, the colliculi can also be seen from the inside and the pineal gland is revealed only if you made a very careful incision.

On this image, the pineal is pinned in yellow and the pin continues on to where the colliculi have been bisected, sheep brain dissection lab report. Other major structures are visible, here the probe indicates the arbor vitae tree of life found within the cerebellum.

The fissure between the cerebrum and the cerebellum is called the transverse fissure. The cerebellum only loosely connects to the rest of the brain when the dura is removed. The image below shows a cleanly separated brain with the major internal structures visible and labeled.

Finally, a section of the brain is cut to examine the difference between white matter and gray matter. Observe the picture below to see how to make this final dissection cut. Once you have made the cut like in the above diagram, you should be able to see the difference between the white and gray matter, just like in the diagram below.

The diagram below will help you understand the difference between the gyri and the sulcus, sheep brain dissection lab report. Clean up as instructed at the beginning of the class period.

Complete your lab review and have it ready to hand in at the beginning of your next class period.

 

Sheep Brain Dissection Lab

 

sheep brain dissection lab report

 

Sheep Brain Dissection 1. The sheep brain is enclosed in a tough outer covering called the dura mater. You can still see some structures on the brain before you remove the dura mater. Sheep Brain Dissection Lab. Follow the directions within this lab to properly dissect and expose the items on your sheep brain. Pay special attention to the items that can be found on your SHEEP BRAIN LAB COMPANION to prepare for your lab exam.. Background Information. Lab: Sheep Brain Dissection 1 **Before starting this lab, open the "Brain Parts and Functions" document. Refer to images, descriptions, and functions of parts of the brain as you proceed through this lab. Sheep brains, although much smaller than human brains, have similar features and can be a valuable addition to anatomy studies.