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Sheep Brain Dissection Lab
- Purpose of today’s 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.
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Sheep Brain Dissection Lab
Directions: View the powerpoint and fill in the blanks on your prelab!
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Why Wrinkles on the Brain?
- the wrinkles and grooves of the cerebrum Fissures = deep groove Sulcus = shallow groove Gyrus = bump
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Dura mater is being peeled away in this photo.
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THE BRAIN ANATOMICAL REGIONS Cerebrum Cerebellum Brain Stem
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CEREBELLUM Balance and coordination
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CEREBRUM - wrinkly large part of the brain, largest area in humans, higher mental function
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Brain Stem - regulates visceral functions (autonomic system)
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Figure 13.4
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1. Cerebral Hemispheres - left and right side separated by the ....
2. Corpus Callosum - connects the two hemispheres
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The Cerebral Hemispheres
Figure 13.7b, c
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Take the Left Brain – Right Brain Test
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Corpus callosum
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4. Fissures – separate lobes
Longitudinal fissure - separate right and left sides
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Transverse Fissure - separates cerebrum from cerebellum
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Lateral Fissure separates the temporal lobe from the Frontal and Parietal lobes
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Lobes of the Brain (general functions)
5. Frontal – reasoning, thinking, language 6. Parietal – touch, pain, relation of body parts (somatosensory) 7. Temporal Lobe – hearing 8. Occipital – vision
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LOBES OF THE BRAIN (CEREBRUM)
Figure 13.7a Sulcus = groove Gyrus = raised bump Fissure = deep groove
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9. Cerebral Cortex - thin layer of gray matter that is the outermost portion of cerebrum (the part with all the wrinkles)
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Functional and Structural Areas of the Cerebral Cortex
Figure 13.11a
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10.VENTRICLES OF THE BRAIN
Fluid filled cavities, contain CSF
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11. Cerebrospinal Fluid (CSF) - fluid that protects and supports brain
Figure 13.27b
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FUNCTIONAL REGIONS A. MOTOR AREAS B. SENSORY AREAS C. ASSOCIATION
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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)
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13. Sensory Area - involved in feelings and sensations
(visual, auditory, smell, touch, taste)
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14. Association Areas - higher levels of thinking, interpreting and analyzing information
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BRAIN STEM Figure 13.4
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BRAIN STEM Consists of three parts: MIDBRAIN PONS MEDULLA OBLONGATA
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14. Diencephalon has 2 parts.....
A. Hypothalamus - hormones, heart rate, blood pressure, body temp, hunger B. Thalamus - relay station
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4. Optic Tract / Chiasma - optic nerves cross over each other
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Cerebellum - balance, coordination
5. Midbrain – visual reflexes, eye movements 6. Pons - relay sensory information 7. Medulla – heart, respiration, blood pressure
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Pituitary Gland The "master gland" of the endocrine system. It controls hormones.
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Corpus callosum Thalamus Pineal gland Hypothalamus
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Medulla Oblongata Midbrain Pons
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Check out these brain images!
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