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WVSOM -- Neuroscience -- Orgainization of Spinal Cord

How many spinal nerves are there? 31
How far does the spinal cord go down to? L2
How many cervical segments? 8
How many coccygeal segements? 1
Which fibers are sensory? dorsal root
Which fibers are motor? ventral
What is in great matter? cell bodies
What is in white matter? bundles of axons
How many layers of lamina are in the grey matter? 10
Where is lamina I of the grey matter? dorsal
Where is lamina IX of the grey matter? ventral
Where is lamina X? surrounds the central cannal
How is white matter divided? 3 paired funiculi
What are the 3 funiculi? posterior, lateral and anterior
Where is the posterior funiculaus? lises between posterior median sulcus and posterior horn
Where is lateral funiculus? lies between dorsal root entry zone and site where ventral root fibers emerge from spinal cord
Where is the anterior funiculus? lies between emerging ventral rootlets and anterior median fissue
What is the anterior median fissure? midline of spinal cord on anterior surface. Contains anterior spinal artery
What is the posterior median sulcus? less distinct groove in posterior midline that separates 2 posterior columns and contains the posterior spinal vein
What is the posterior intermediate sulcus? divides each posterior funiculus into 2 white columns. Only present in cervical and upper thoracic segments
How does spinal cord anatomy vary at different levels? size and shape, relative amounts of gray/white matter and amount/configuration of gray matter
What are the characteristics of the sacral cord? small diameter with large amounts of gray compared to white matter. Short, thick gray commissure and large anterior and posterior horns
What 4 white matter tracts are we responsible to know the location of? Gracile fasciculus, dorsolateral tract, lateral corticospinal tract and anteriolateral system
What is the function of the gracile fasciculus? ascending sensory axons below T7
What is the function of the dorsolateral tract? pain
What is the function of the lateral corticospinal tract? main motor pathway
What is the function of the anterolateral system? pain/temperature pathway
What are the characteristics of the lumbar cord? nearly circular, massive horns, less white matter than cervical segments, and L1 and L3 resemble lower thoracic levels with a lateral horn
What are the characteristics of a thoracic cord? small diameter due ot marked reduction in grey matter. Small horns. Lateral horn containing intermediolateral cell columns present at all thoracic levels. Dorsal nucleus of Clarke
What is the Dorsal nucleus of Clarke? rounded collection of large cells at base of medial aspect of posterior horn. Present at all thoracic levels
What are the characteristics of the cervical cord? large size with a lot of white matter. Oval shape with prominent posterior intermediate septum
What does the posterior intermediate septum? divides the posterior funiculus into fasciulus gracilis and fasciculus cuneatus
What is the cuneate fasciculus? white matter lateral to the posterior intermediate sulcus
What is the cuneate fasciculus? Relays ascending sensory axons from spinal levels T7 and up
What cell type are primary sensory neuron? psuedounipolar neuron
What nerves have faster conduction velocity? those nerves with larger diameter
What fiber type is proprioception? A alpha, fastest conduction
What fiber type is touch, pressure? A beta
What fiber type is moter to muscle spindles? A gamma
What fiber type is pain, temperature and touch? A delta
What fiber type is preganglionic autonomic? B
What fiber type is pain, reflex responses? C Dorsal root
What fiber type is postganglionic sympathethetics? C sympathetic
Which fibers are myelinated? A and B
Which fibers are unmyelinated? C
Created by: tjamrose