Term
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Definition
| conical distal (inferior) end of the spinal cord |
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Term
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Definition
- consists of pia & glial
- attaches from dra to coccyx |
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Term
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Definition
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Term
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Definition
| contains dorsal and ventral roots that go out of the vertebral foramen |
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Term
Spinal Cord Segment
(definition & divisions) |
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Definition
gives rise to a spinal nerve
Divisions...
31 segments
8 cervical
12 thoracic
5 lumbar
5 sacral
1 coccygeal |
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Term
| Each Spinal Segment Contains |
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Definition
| 2 ventral roots and 2 dorsal roots |
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Term
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Definition
increased number of LMNs to innervate limbs = bigger gray matter
Cervical Enlargement
&
Lumbosacral Enlargement |
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Term
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Definition
| area of skin innervated by a dorsal root ganglion |
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Term
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Definition
posterior median sulcus
posterolateral sulcus
anterolateral sulcus
anterior median fissure |
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Term
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Definition
- H shaped surrounded by white matter
3 parts
- ventral (or anterior) gray column
- intermediolateral gray column
- dorsal gray column |
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Term
| ventral/ anterior gray column |
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Definition
| contains cells of origin of the ventral roots, including alpha and gamma motor neurons |
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Term
| intermediolateral gray column |
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Definition
- between dorsal and ventral column
- dorsal nucleus of Clarke = expansion in the dorsomedial region
- from T1 to L2 = preganglionic cells for sympathetic nervous system
- from S2 - S4 = preganglionic cells for parasympathetic nervous system |
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Term
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Definition
| contains neurons that receive incoming snesory fibers; consist of interneurons & projection neurons |
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Term
| Dorsolateral tract of Lissauer |
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Definition
| unmyelinated or lightly myelinated fibers conveying pain and temperature sensation |
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Term
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Definition
-neurons that respond to noxious stimuli
- some neurons send axons to deeper layers of dorsal horn |
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Term
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Definition
- substania gelatinosa
- made up of small neurons that respond to noxious stimuli, Substance P |
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Term
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Definition
-nucleus proprius
- main input from fibers that convey position and light touch sense |
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Term
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Definition
| - respond to noxious and visceral afferent stimuli |
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Term
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Definition
- deepest layer of dorsal horn
- contains neurons responding to stimuli from joints and skin |
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Term
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Definition
- medial zone that contains the cells of dorsal nucleus (Clarke's column)
- contains intermediolateral cell column |
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Term
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Definition
- contains medial motor neuron column = innervate axial muscles
- contains lateral motor neuron column = innervates limbs |
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Term
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Definition
| small neurons around central canal |
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Term
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Definition
- in white matter
- separed by fissure |
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Term
| Stretch Reflex - Homonymous Reflex |
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Definition
- 1 synapse
- sensory info & motor command goes to same muscle |
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Term
| Homonymous Reflex - reciprocal inhibition |
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Definition
- di synaptic
- inhibitory interneurons relax antagonist
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Term
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Definition
- disynaptic or polysynaptic
- stimulus crosses over the anterior white commisure, causing the other limb to extend |
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