9.3 the brain
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Transcript of 9.3 the brain
The BrainSection 9.3
Pgs. 427-434
We are learning to…Describe the anatomy of the nervous system.
Explain the mechanisms that enable the body to maintain homeostasis by understanding the physiology of the nervous system.
Activities1. Cocktail party – circulate with others
Talk about the weather, school, gossip, biology
2. Memory Challenge
3. Say the Word, not the Colour
BlueGREENORANGE
The Central Nervous System (CNS)CNS = Brain + Spinal Cord
The Cerebrum (pg. 429)
SC 41: Label the parts of the brain and describe the function of each
Motor Cortex
SC 41: Label the parts of the brain and describe the function of each
Summary (pg. 429)
SC 41: Label the parts of the brain and describe the function of each
Nervous/Endocrine ConnectionBelow the cerebrum is the thalamusBelow the thalamus is the hypothalamus
A direct connection between the hypothalamus and the pituitary gland unites the nervous system with the endocrine system
MidbrainThe midbrain is less developed than the
forebrainActs as a relay centre for some eye and ear
reflexes
Brains
HindbrainCerebellum - controls limb movements, balance, and
muscle tone
Pons (bridge) - a relay station that passes information between the two regions of the cerebellum and between the cerebellum and the medulla
Medulla oblongata - acts as the connection between the peripheral and central nervous systems; also acts as coordinating centre for the autonomic nervous systemControls involuntary muscle movement… such as?Heart rate, breathing, vessel diameter,
Brain StructureThe Brain is covered by a three-layer
protective membrane known as the meningesOuter layer = dura materMiddle layer = arachnoid materInner layer = pia mater
These three layers form the blood-brain barrier, determining what chemicals will reach the brain
Meninges
MeningitisBacterial or viral infection of the meningesSymptoms include:
Intense headacheStiff neckFever, confusionVomiting
Medical emergency - can lead to death if untreated
SC 40: Discuss the relationship between the CNS and meningitis
Cerebro Spinal Fluid (CSF)Cerebrospinal fluid
circulates between the innermost and middle meninges of the brain and through the central canal of the spinal cordShock absorberTransport medium, carrying
nutrients to brain cells while relaying wastes from the cells to the blood
This One Goes to 11…Physicians can extract cerebrospinal fluid from the spinal cord to diagnose bacterial or viral infection. The technique, referred to as a lumbar puncture or spinal tap, is used to identify poliomyelitis and meningitis
The Spinal Cord
Success Criteria40. Discuss the relationship between the CNS
and meningitis.41. Label the parts of the brain and describe
the function of each.
DissectionSafety
Hair tied back, goggles and gloves worn
RespectThis is an educational opportunityMishandling of the specimens will not be
tolerated at all
GoalsTry to identify different regions of the brainTry to separate the different layers of the
meningesTry to find your goal structures