where does the spinal cord terminate
conus medullaris
cauda equina
collection of Lumbar and Sacral Nerve roots
Filum Terminale
a ligament which anchors spinal cord in place
how many pairs of nerves arise from the spinal cord
31
what segments of the spinal cord lie within conus medullaris
L1 - L2
what does the central canal and why
Cerebrospinal Fluid to:
- nourish
- protect
- remove waste
Structure of Gray matter
- neuron cell bodies
- unmyelinated aoxns
- neuroglia
Structure of White Matter
- myelinated axons
what does the dorsal root consist of
axons of 1st order sensory neurons
what does ventral root consist of
axons of motor neurons
Sensory Function - Vibration
receptors, tract, pathway, location
- mechano receptors
- ascending FG + FC tract
- Posterior Column Pathway
- Posterior White Column
Sensory Function - Fine Touch
receptors, tract, pathway, location
- Mechanoreceptors
- ascending FG + FC tract
- posterior column pathway
- posterior white column
Sensory Function - Crude Touch
receptors, tract, pathway, location
- Mechanoreceptors
- ascending L/A spoinothalamic
- spinothalamic pathway
- anterior white column
Sensory Function - Pain
receptors, tract, pathway, location
- Nocioceptors
- Ascending L/A spinothalamic tract
- Spinothalamic Pathway
- Anterior White Column
Sensory Function - Temp
receptors, tract, pathway, location
- Thermoreceptors
- Ascending L/A Spinothalamic tract
- Spinothalamic Pathway
- anterior white column
Sensory Function - Proprioception
receptors, tract, pathway, location
- Proprioceptors
- FG + FC
- Posterior Column Pathway
- Posterior White Column
Which three neurons relay general sensory info to primary somatosensory cortex and where do they terminate
1st = brain stem 2nd = posterior gray horn 3rd = primary somatosensory cortex
what does an abnormal response to the romburg test mean
problems with
- vestibular pathway
- proprioception
- spinothalamic pathway
- posterior column pathway
Assessment of Motor Function - Gait
info, pathway, tract
- somatic motor output of limbs
- lateral corticospinal pathway
- descending corticospinal tract
Assessment of Motor Function - Point to Point Movement
info, pathway, tract
- Somatic Motor Output of Limbs
- Lateral corticospinal pathway
- descending corticospinal pathway
what is the signifigance of a positive/abnormal babinski sign
primary motor cortex or descending corticospinal tract is damaged
