Term
Synonyms for:
Dorsal
Ventral
Anterior
Posterior
---In humans, above midbrain |
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Definition
Above midbrain-
Anterior: rostral
Posterior: caudal
Superior: dorsal
Inferior: ventral
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Term
Synonyms for:
Anterior
Posterior
Superior
Inferior
---in human, below midbrain |
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Definition
Below midbrain:
Anterior: ventral
Posterior: dorsal
Superior: rostral
Inferior: caudal |
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Term
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Definition
parallel to ground above midbrain
perpendicular to ground below midbrain
(parallel to longitudinal axis, cuts side to side, front to back) |
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Term
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Definition
vertical to ground in brain
horizontal to ground in spinal cord
(perpendicular to longitudinal axis, cuts side to side, top to bottom
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Term
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Definition
always vertical to ground, creates midline (dividing brain into two hemispheres)
(parallel to longitudinal axis, cuts top to bottom, front to back)
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Term
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Definition
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Term
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Definition
| contain clusters of somas of sensory neurons |
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Term
| dorsal ramus/ventral ramus |
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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!
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Term
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Definition
| groups of centrally directed sensory neuron axons that terminate in dorsal horn |
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Definition
| groups to motor neuron axons whose somas originate in ventral horn |
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Term
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Definition
| merging point of periferraly directed sensory and motor neuron axons as they exit the spinal cord (through the inter vetebral foramen) |
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Term
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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
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Term
| Spinal column nerve segmentation |
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Definition
cervical: C1-C8
thoracic: T1-T12
lumbar: L1-L5
sacral: S1-S5
coccygeal: Cx1 |
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Term
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Definition
combination of dorsal and ventral roots located below where vertebral column ends (L1/L2)
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Term
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Definition
- fluid filled cavity surrounding cauda equina, begins around L1-L2 (L3-L4 in newborns)
- location for spinal taps
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Term
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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
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Term
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Definition
| culumns of white matter bundles running along length of spinal cord transmitting information between specific brain centers and spinal cord segments |
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Definition
| subdivisions of larger funiculi, form tracts named for therir origin and termination points |
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Term
| relative concentrations of gray matter in the spinal cord |
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Definition
| increases at cervical (arms) and lumbar (legs) segments of spinal cord- lots of motor and sensory info being transmitted, especially in ventral horn |
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Term
| cervical section of spinal cord |
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Definition
- largest size
- largest proportion of white matter
- large amount of grey matter (for arms)
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Term
| thoracic section of spinal cord |
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Definition
- intermediate size
- intermediate-high proportion of white matter
- very small amount of grey matter (especially in ventral horns)
- prominent lateral horns
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Term
| lumbar sections of the spinal cord |
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Definition
- intermediate size
- intermediate-low proportion of white matter
- large amount of grey matter (for legs)
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Term
| sacral sections of the spinal cord |
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Definition
- smallest size
- smallest proportion of white matter
- intermediate amount of grey matter
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