You will need to write out a Nerve Pathway Tracing for the following description
ID: 3513296 • Letter: Y
Question
You will need to write out a Nerve Pathway Tracing for the following descriptions based on the major nerves and plexuses that you just drew on the diagram above. Your nerve tracings will have the following general format. The terms in italics will need to be changed based on the tracing. The terms in bold will be the same for all tracings (not including special senses) From sensation to the brain: Appropriate receptor Appropriate spinal nere(s)-) Appropriate plexus (if needed)-) Appropriate ramus-) Dorsal Root Ganglion-) Dorsal Root Dorsal Horn-) white matter tract up spinal cord-) Thalamus-) Internal Capsule Sensory Cortex (Parietal Lobe) From the brain to motor action: Motor Cortex (Frontal Lobe) Internal Capsule Thalamus Brain Stem white matter tract down spinal cord Ventral Horn Ventral Root Appropriate ramus Appropriate plexus (if needed) Appropriate spinal nerve(s) Effector (muscle/organ/gland)Explanation / Answer
3) The photon of light is received by eyes and the signal is transmitted to the nervous system.
From eye to the brain:
Eyes - - - - > Optic nerves - - - - > Dorsal column system (fasciculus cuneatus) - - - - > Dorsal root ganglion - - - - > Dorsal horn - - - - > white matter tract up spinal cord - - - - > Ventral horn - - - - - > Ventral root - - - - > Optic chasmm - - - - > Lateral geniculate nucleus - - - - > Visual cortex.
After the sensation of photon of light reaches visual cortex, it sends signal to limbs to increase motor activity.
From brain to motor action:
Motor cortex - - - - > Internal capsule - - - - > Thalamus - - - - > Brain stem - - - - > white matter tract down spinal cord - - - - > Ventral horn - - - - > Ventral root - - - > Somatic motor neurons from lumbar spinal cord - - - - > Neuromuscular junction of leg muscles - - - -> Quadriceps, Hamstrings, hip flexors and calf muscles.
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