Spinal Cord Flashcards
Spinal cord extends from
Foramen Magnum to L2 Vertebra
Region for Lumbar Puncture
L2 to S2
Medial Division FIbers
What sensations travel in
1a
1b
A-beta
Lateral Division Fibers
A - Delta and C fibers
What sensations travel in
A-Delta
C
Alpha motor neurons vs gamma motor neurons
Regions of spinal cord with large ventral horn
C5-T1, L2-S2
Topographic organization of ventral horn
UMN have what net effect on muscles
A net inhibitory effect
Axons in corticospinal tract/pyramidal tract cross at
Function of axons in corticospinal tract
Voluntary refines movements of distal extreities
Reticulospinal and Vestibulospinal tracts from
Extensor biased UMN
reticulospinal tract activate
Extensor neurons for postural support
Lateral vestibulospinal tract fascilitates
alpha motor neurons that innerate extensor muscles
Medial vestibulospinal tract facilitates
alpha motor neurons innervating neck and upper limb muscles in response to vestibular stimul
Dorsal column pathway/medial lemniscal system carries which sensory fibers
A-beta, 1a, 1b fibers
Upper limb vibration, eissner, proprioception all travel in
Lateral column - Fasciculus cuneatus
Lower limb vibration, touch, proprioception ravel in
Medial Column - fasciculus gracilis
Dorsal Column pathway neurons cross at
Secondary Sensory neurons of dorsal column tract synapse on
Dorsal column pathway secondary neurons synapse on the ventral posterior lateral nucleus
Anterolateral system contains which nerve fibers
A-delta and C fibers
In what tract do anterolateral primary sensory neurons ascend or descend a few segments
Lissauer’s tract
A-delta fibers carry which pain type and which temperature type
Sharp pain and cold
C fibers carry which pain type and temperature type
Aching pain and warmth
AnteroLateral system neurons travel in which tract through spinal cord
Spinothalmic tract
Anterolateral pathway secondary neurons synapse on
Ventral posterior lateral nucleus
Rule regarding sensory neuron crossing
Must be in vicinity of secondary neuron cell body
Spinocerebellar system function
unconcious proprioreception to cerebellum
Lower Limb proprioception travelling to cerebellum travel in
First Clarke Nucleus and then through Dorsal Spinocerebellar
Upper limb proprioception travelling to cerebellum travels through
cuneocerebellar tract after first passing htrough external cuneate nucleus
Which cells synapse with pre-ganglionic sympathetic neurons in the intermediolateral cell column
Descending hypothalmic axons
3 Types of Bladder disorders occur at which levels of the spinal cord
INfantile bladder
Spastic bladder
Flaccid or atonic bladder
Rubrospinal tract crosses at (site of decussation)
Ventral tegmental
Horners Syndrome
