Nervous system

• The function of of the nervous system is:  

  Detects impulses from the senses; control center. 
• Major Organs consist of: 

  • Brain 
  • Spinal Cord 
  • Senses 
  • Nerves 
• Central Nervous System (CNS) contains: brain and spinal cord
• Peripheral Nervous system contains the other nerves
• Cranial nerves- originate in the brain
• spinal nerves- originate in the spinal cord
• Between the arachnoid layer and the pia mater is the Cerebrospinal fluid (CSF)
• Cerebrospinal fluid (CSF). 

  • Prevents the brain from contacting the skull \
  • blood-brain barrier = which controls homeostasis for the brain and prevents infection 
• Cerebrum: 

  
  

  Largest part of brain; Divided into 2 hemispheres 

  • Outer cerebral cortex= “gray matter” -Controls conscious activities 
  • Inner cerebral medulla= “white matter” 
• Outer cerebral cortex= “gray matter” 
• Inner cerebral medulla= “white matter”
• What are the four lobes of the brain

  1. frontal
  2. temporal
  3. occipital
  4. parietal
• The brainstem is located between the cerebrum and the spinal cord
• The brainstem is broken into three regions:

  midbrain

  pons

  Medulla oblongata
• Cerebrum is the second largest part of the brain
• Cerebellum located at the back of the skull just under the brain
• cerebellum is responsible for coordinating the

  movements directed by the

  cerebrum so that they are graceful

  and efficient
• cerebellum is all involuntary
• Cerebellum aids in muscle memory
• There are 31 spinal nerve pairs
• The purpose of spinal nerves is to relay impulses from the peripheral nervous system to the brain
• Spinal cord connects to all parts of the body
• I cross-section the spinal cord, has a “butterfly“ of gray matter
• Each hemisphere consists of four lobes: frontal lobe, parietal lobe, temporal lobe, occipital lobe
• outer cerebral cortex Controls conscious activities
• inner cerebral cortex controls unconscious activities