Sheep Brain Dissection Lab

1. - Purpose of today’s lab Sheep Brain Dissection Lab Examine the gross anatomy of a sheep brain. Compare the anatomy of a sheep brain to a human brain and make physiological predictions based on your observations.

2. Directions: View the powerpoint and fill in the blanks on your prelab! Sheep Brain Dissection Lab

3. - the wrinkles and grooves of the cerebrum Why Wrinkles on the Brain? Fissures = deep groove Sulcus = shallow groove Gyrus = bump

4. Dura mater is being peeled away in this photo.

6. ANATOMICAL REGIONS • Cerebrum • Cerebellum • Brain Stem THE BRAIN

7. Balance and coordination CEREBELLUM

8. CEREBRUM - wrinkly large part of the brain, largest area in humans, higher mental function

9. Brain Stem - regulates visceral functions (autonomic system)

11. Figure 13.4

12. 1.  Cerebral Hemispheres    -  left and right side separated by the .... 2.  Corpus Callosum  -  connects the two hemispheres 

13. The Cerebral Hemispheres Figure 13.7b, c

14. Take the Left Brain – Right Brain Test

15. Corpus callosum

16. 4.  Fissures – separate lobes Longitudinal fissure - separate right and left sides

17. Transverse Fissure - separates cerebrum from cerebellum

18. Lateral Fissure separates the temporal lobe from the Frontal and Parietal lobes

20. 5.  Frontal – reasoning, thinking, language 6. Parietal – touch, pain, relation of body parts (somatosensory) 7.  Temporal Lobe – hearing 8.  Occipital – vision Lobes of the Brain (general functions)

21. LOBES OF THE BRAIN (CEREBRUM) Figure 13.7a Sulcus = groove Gyrus = raised bump Fissure = deep groove

22. 9.  Cerebral Cortex - thin layer of gray matter that is the outermost portion of cerebrum (the part with all the wrinkles)

23. Functional and Structural Areas of the Cerebral Cortex Figure 13.11a

24.   10.VENTRICLES OF THE BRAIN Fluid filled cavities, contain CSF

25. 11.  Cerebrospinal Fluid (CSF) - fluid that protects and supports brain Figure 13.27b

26. A. MOTOR AREAS • B. SENSORY AREAS • C. ASSOCIATION FUNCTIONAL REGIONS

27. 12.  Motor Areas - controls voluntary movements- the right side of the brain generally controls the left side of the body -also has Broca's Area (speech)

28. 13.  Sensory Area - involved in feelings and sensations    (visual, auditory, smell, touch, taste)

29. 14.  Association Areas - higher levels of thinking, interpreting and analyzing information

30. BRAIN STEM Figure 13.4

31. Consists of three parts:   MIDBRAIN PONS MEDULLA OBLONGATA BRAIN STEM

32. 14.  Diencephalon         has 2 parts..... A. Hypothalamus - hormones, heart rate, blood pressure, body temp, hunger B. Thalamus - relay station

33. 4.  Optic Tract / Chiasma - optic nerves cross over each other

35. Cerebellum - balance, coordination 5.  Midbrain – visual reflexes, eye movements 6. Pons - relay sensory information 7.  Medulla – heart, respiration, blood pressure

36. Pituitary Gland The "master gland" of the endocrine system.  It controls hormones.

37. Corpus callosum Thalamus Pineal gland Hypothalamus

38. Midbrain Medulla Oblongata Pons

40. Check out these brain images!