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Gross Structure: Spinal Cord
Functional Neuroanatomy
23
Anatomy
Undergraduate 4
09/08/2013

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Cards

Term

Synonyms for:

Dorsal

Ventral

Anterior

Posterior

---In humans, above midbrain

Definition

Above midbrain-

    Anterior: rostral

    Posterior: caudal

    Superior: dorsal

    Inferior: ventral

 

 

Term

 Synonyms for:

    Anterior

    Posterior

    Superior

    Inferior

---in human, below midbrain

Definition

 Below midbrain:

    Anterior: ventral

    Posterior: dorsal

    Superior: rostral

    Inferior: caudal

Term
horizontal plane
Definition

parallel to ground above midbrain

perpendicular to ground below midbrain

(parallel to longitudinal axis, cuts side to side, front to back)

Term
coronal plane
Definition

vertical to ground in brain

horizontal to ground in spinal cord

(perpendicular to longitudinal axis, cuts side to side, top to bottom

Term
sagittal plane
Definition

always vertical to ground, creates midline (dividing brain into two hemispheres)

(parallel to longitudinal axis, cuts top to bottom, front to back)

 

 

Term
parasagittal
Definition
lateral to midline
Term
dorsal root ganglia
Definition
contain clusters of somas of sensory neurons
Term
dorsal ramus/ventral ramus
Definition
  • major branches of spinal nerves containing both sensory and motor neurons
  • dorsal ramus: thinner, innervates structures along back/dorsal surfaces
  • ventral ramus: thicker, innervates structures along ventral surfaces
  • not a root!
Term
dorsal roots
Definition
groups of centrally directed sensory neuron axons that terminate in dorsal horn
Term
ventral roots
Definition
groups to motor neuron axons whose somas originate in ventral horn
Term
spinal nerve
Definition
merging point of periferraly directed sensory and motor neuron axons as they exit the spinal cord (through the inter vetebral foramen)
Term
lateral horn
Definition
  • small, intermediate horn containing cell bodies of pre-ganglionic motor neurons of the ANS
  • axons exit ventral roots, travel via spinal nerves, synapse on postganglionic motor neurons innervating smooth muscle of internal organs
  • located in thoracic and upper lumbar regions 
Term
Spinal column nerve segmentation
Definition

cervical: C1-C8

thoracic: T1-T12

lumbar: L1-L5

sacral: S1-S5

coccygeal: Cx1

Term
cauda equina
Definition

combination of dorsal and ventral roots located below where vertebral column ends (L1/L2)

 

Term
lumbar cistern
Definition
  • fluid filled cavity surrounding cauda equina, begins around L1-L2 (L3-L4  in newborns) 
  • location for spinal taps
Term
Rexed's laminae
Definition
  • equivalent of spinal cord nuclei--
  • Layers I-VI: dorsal horn, process and relay sensory information
  • Layers VIII & IX: ventral horn, contains somatic motor neurons
  • Layer VII: intermediate (lateral) horn, contains prganglionic autonomic motor neurons
  • Layer X: surround central canal
Term
funiculi
Definition
culumns of white matter bundles running along length of spinal cord transmitting information between specific brain centers and spinal cord segments
Term
fasciculi
Definition
subdivisions of larger funiculi, form tracts named for therir origin and termination points
Term
relative concentrations of gray matter in the spinal cord
Definition
increases at cervical (arms) and lumbar (legs) segments of spinal cord- lots of motor and sensory info being transmitted, especially in ventral horn
Term
cervical section of spinal cord
Definition
  • largest size
  • largest proportion of white matter
  • large amount of grey matter (for arms)
Term
thoracic section of spinal cord
Definition
  • intermediate size
  • intermediate-high proportion of white matter
  • very small amount of grey matter (especially in ventral horns)
  • prominent lateral horns
Term
lumbar sections of the spinal cord
Definition
  • intermediate size
  • intermediate-low proportion of white matter
  • large amount of grey matter (for legs)
Term
sacral sections of the spinal cord
Definition
  • smallest size
  • smallest proportion of white matter
  • intermediate amount of grey matter
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