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Are you going to fight or flee


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Are you going to fight or flee

  1. 1. Are you going to fight or flee? Gatlin period 1 Group 2
  2. 2. Cerebral Cortex & Somatic pathways Motor & Sensory -layer of the brain often referred to as gray matter.(9) -Pathways that transport nerves to and from the brain. (9)
  3. 3. Phrase Word MatchCortex Sensory Evolution Motor Brain Two-ThirdsThe cerebral ______ is dividedinto right and left hemispheres. It Afferent pathways: Sensoryencompasses about ______ of the information coming from thebrain mass and lies over and _________ receptors througharound most of the structures of peripheral nerves to the spinalthe brain. It is the most highly cord and on to the brain.developed part of the human Efferent pathways._______and is responsible for _______commands comingthinking, perceiving, producing from the brain and spinal cord,and understanding language. It is through peripheral nerves toalso the most recent structure in effecter organs.the history of brain ______.
  4. 4. Answer: skeletal muscles innervated by one ormore given spinal nerves (8) Mytosomes Puzzle!
  5. 5. Answer: skin surface areas supplied by a singlespinal nerve (8) Dermatomes Puzzle!
  6. 6. Answer: intersecting and communicatingspinal nerves (8) Nerve Plexuses Puzzle!
  7. 7. Meninges meninges, three membranous envelopes—pia mater, arachnoid, and dura mater—that surround the brain and spinal cord. Cerebrospinal fluid fills the ventricles of the brain and the space between the pia mater and the arachnoid. The primary function of the meninges and of the cerebrospinal fluid is to protect the central nervous system. (10)
  8. 8. Pia Mater The pia mater is the meningeal envelope that firmly adheres to the surface of the brain and spinal cord. It is a very thin membrane composed of fibrous tissue covered on its outer surface by a sheet of flat cells thought to be impermeable to fluid. The pia mater is pierced by blood vessels that travel to the brain and spinal cord. (10)
  9. 9. Arachnoid Over the pia mater and separated from it by a space called the subarachnoid space is the arachnoid, a thin, transparent membrane. It is composed of fibrous tissue and, like the pia mater, is covered by flat cells also thought to be impermeable to fluid. In the region of the brain, particularly, a large number of fine filaments called arachnoid trabeculae pass from the arachnoid through the subarachnoid space to blend with the tissue of the pia mater. The arachnoid trabeculae are embryologic remnants of the common origin of the arachnoid and pia mater, and they have the frail structure characteristic of these two of the meninges. The pia mater and arachnoid together are called the leptomeninges. (10)
  10. 10. Dura MaterThe outermost of the three meninges is thedura mater (or pachymeninx), a strong, thick,and dense membrane. It is composed ofdense fibrous tissue, and its inner surface iscovered by flattened cells like those presenton the surfaces of the pia mater andarachnoid. The dura mater is a sac thatenvelops the arachnoid and has beenmodified to serve several functions. The duramater surrounds and supports the largevenous channels (dural sinuses) carryingblood from the brain toward the heart.(10)
  11. 11. CSF Cerebrospinal fluid (CSF) is a clear, colorless liquid that bathes the brain and spinal cord. While the primary function of CSF is to cushion the brain within the skull and serve as a shock absorber for the central nervous system, CSF also circulates nutrients and chemicals filtered from the blood and removes waste products from the brain. Examining the fluid can be useful in diagnosing many diseases of the nervous system, including MS(11)
  12. 12. Spinal CordThe Spinal Cord is connected to the brain and is about thediameter of a human finger. From the brain the spinal corddescends down the middle of the back and is surrounded andprotected by the bony vertebral column. The spinal cord issurrounded by a clear fluid called Cerebral Spinal Fluid (CSF),that acts as a cushion to protect the delicate nerve tissuesagainst damage from banging against the inside of thevertebrae.The nerves which exit the spinal cord in the mid and lowersection of the back, control the trunk and legs, as well asbladder, bowel and sexual function.The nerves which carry information from the brain to musclesare called Motor Neurones. The nerves which carry informationfrom the body back to the brain are called Sensory Neurones.Sensory Neurones carry information to the brain about skintemperature, touch, pain and joint position.The brain and spinal cord are referred to as the CentralNervous System, whilst the nerves connecting the spinal cordto the body are referred to as the Peripheral NervousSystem.(12)
  13. 13. (9)
  14. 14. Peripheral Nervous System Across 2. purpose includes slowing down your heartbeat, lowering your blood pressure, and increasing blood flow to your skin. Down 1. function is the mobilization of the body’s nervous system due to fight or flight response. 3. Functions to regulate the basic visceral (organ) processes needed for the maintenance of normal bodily functions.