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Rutgers - BIO 119127 - Class Notes - Week 5

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Schools > Rutgers University > Neurobiology > BIO 119127 > Rutgers - BIO 119127 - Class Notes - Week 5

Rutgers - BIO 119127 - Class Notes - Week 5

School: Rutgers University
Department: Neurobiology
Course: Anatomy & Physiology: Health Sciences
Professor: Anthony Uzwiak
Term: Spring 2018
Tags: SPINE, nerves, somatosensory, touch, Nociception, senses, pathways, and spinal
Name: Rutgers Anatomy, Uzwiak Week 5
Description: Somatosensory System, Hearing, Spinal Nerves
Uploaded: 03/02/2018
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background image  More Somatosensory System *Side note- cranial nerves are responsible for innervating the front of your 
face
● Only sternocleidomastoid and trapezius are innervated by the  accessory nerve (a cranial nerve) Spinal Nerves ● To know where a stimulus, such as pain or muscle stretch is coming  from, axons of certain regions correspond to certain regions on the 
spinal cord 
● 31 sets of spinal nerves
● Several segments in each region 
● Cervical- 8 ○ Process info from back of the head, back of the neck, to the arms
○ Note: Front of the face and neck are controlled by cranial 
nerves  ● Thoracic- 12 ○ Clavicles to Umbilicus ● Lumbar- 5 ○ Umbilicus to the front of your legs ● Sacral- 5 ○ Back of legs
○ Posterior of the body
● Coccygeal- 1 ○ Most posterior aspect of legs
○ If we had tails, they would be innervated by the coccygeal 
dermatome ■ The surface area right above where our tail would be is  innervated Segment ● Gray matter ○ 2 sets of horns ■ Ventral
■ Lateral
■ Dorsal
○ Gray bridge connects sets of horns ● Central canal  ○ In the middle of gray bridge ● Funiculi- complex bundles of axons (white matter) ○ Ex) trucks, cars, bus lanes vs. car only lanes
background image ■ Singular turnpike, but other characteristics determine  where you drive ○ Dorsal funiculus
○ Lateral funiculus
○ Ventral funiculus
● Dorsal Root ○ Where sensory information goes
○ Cell bodies found in the dorsal root ganglion (DRG)
● Ventral Root ○ Where motor information goes
○ Cell bodies are found in the ventral horn
○ Axons will eventually follows a ramus to another nerve, then its 
destination ○ Ex) there’s no road that directly goes to your driveway ● Spinal Nerve ○ Motor AND Sensory information
○ Comes from joining the 2 roots 
● Ventral/Dorsal Ramus ○ Branches off (bifurcates) from the spinal nerve either anteriorly  or posteriorly ○ Ventral ramus carries much more because the spine is closer to  our back ● Dermatome ○ Limited segment of the body 
○ 31 dermatomes
Somatic Information Pathway ● RIGHT side stimuli processed by LEFT side of brain ● Part of dorsal funiculus is the dorsal column
● Touch and Proprioception
○ DCML- dorsal column, medial lemniscal
○ NO synapse on spinal cord; instead, it runs up the dorsal 
column ○ Axons of somatosensory neurons for touch, pressure and  proprioception run through here ○ Doesn’t cross over in the spinal cord
○ Synapses in the brain stem (medulla)
○ Medial lemniscal pathway- where info crosses over 
background image ■ Goes to the thalamus, which will then relay the info to the postcentral gyrus of the parietal lobe (primary 
somatosensory cortex
)
● Nociceptor ○ ST- Spinothalamic Pathway
○ Through dorsal root
○ Synapses at lateral horn
○ Crosses to contralateral (left) side using the gray bridge
○ Runs up the spinal pathway
○ Goes to thalamus, then primary somatosensory cortex
● 2 separate pathways ○ Touch and Proprioception Pain and Temperature

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School: Rutgers University
Department: Neurobiology
Course: Anatomy & Physiology: Health Sciences
Professor: Anthony Uzwiak
Term: Spring 2018
Tags: SPINE, nerves, somatosensory, touch, Nociception, senses, pathways, and spinal
Name: Rutgers Anatomy, Uzwiak Week 5
Description: Somatosensory System, Hearing, Spinal Nerves
Uploaded: 03/02/2018
7 Pages 34 Views 27 Unlocks
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  • Notes, Study Guides, Flashcards + More!
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