Other Senses

• Auditory Pathway

  
  

  Outer Ear > Cochlea > Spiral Ganglion > Cochlea Nuclei > Inferior Colliculus > Medial Geniculate > Primary Auditory Cortex
• The Anterior Auditory Pathway or the "what" stream helps in identifying sounds

  
  

  Anterior Temporal Lobe > Anterior Frontal Cortex
• Posterior Auditory Pathway or "where" stream helps in locating external objects in space

  Lateral Parietal Lobe > Pre- Frontal Cortex
• Primary Auditory Cortex helps an individual to hear a

  certain pitch from a particular direction
• Secondary Auditory Cortex helps fully formed auditory percepts
• Association Auditory Cortex also has the same function as Secondary Auditory Cortex
• Left Temporal Lobe: Speech Sounds
• Right Temporal Lobe: Musical Sounds
• The touch pathway of the nervous system is a system used to detect and interpret pressure, vibration and temperature.
• Spinothalamic tract (STT) is a sensory tract that carries nociceptive, temperature, crude touch, and pressure from our skin to the somatosensory area of the thalamus. It is responsible for our quick withdraw reaction to a painful stimulus such as touching the stove burner
• 1st Order neuron: receptor > Dorsal Column > Medulla
• 2nd Order Neuron: Medula > Medial Lemniscus > Thalamus
• 3rd Order Neuron: Thalamus > Cerebral Cortex
• Primary somatosensory cortex or the Homonculus is the body map of different areas of the body that can receive sensory stimulation
• Secondary somatosensory cortex combines the sensory information from the left and right side of the body
• Secondary somatosensory cortex also correlates to the temporal lobes specifically the hippocampus for stimulus related to memory, or previously encountered stimulus
• Posterior Parietal Lobe integrates somato sensation to other senses particularly the vision. It helps us to locate objects in space , even our own limbs.
• C Fibers : prolonged burning and aching pain (slow)
• Delta A : sharp pain (fast)
• Lateral Spino – thalamic Tract

  Order of Neurons:

  
  

  1st : Dorsal root spinal ganglion (outside spinal cord)
• Lateral Spino – thalamic Tract

  Order of Neurons:

  2nd: Posterior gray horn (inside spinal cord)
• Lateral Spino – thalamic Tract

  Order of Neurons:

  3rd: Ventral posterior Nuclei (thalamus)
• The nociception pathway is a series of a neural system that connect the brain and the spinal cord to both sensory and affective area in the body