Nuclei/Lamina/Tracts Flashcards
Location of marginal zone in gray matter
Tip of dorsal horn
Marginal zone function
Sensory pain + temp sensation
Location of substantial gelatinosa in gray matter
Top of dorsal horn
Substantia gelatinosa function
Sensory pain, temp, + light touch
What type of fibers are associated with substantial gelatinosa?
Type C fibers
Location of dorsal nucleus of Clarke in gray matter
Dorsal-medial surface
Dorsal nucleus of Clarke function
Unconscious proprioception
What tract runs through dorsal nucleus of Clarke?
Spinocerebellar tract
Location of motor neurons in gray matter
Lateral + medial ventral horn
Motor neurons function
Innervate viscera (organs) + skeletal muscle
Dorsal horn location throughout spinal cord
ALL spinal levels
Dorsal horn function
Somatosensory
Intermediate column/lateral horn spinal location
T1-L2
Intermediate column function
Autonomic neurons
Ventral horn location
In the lower motor neurons
Ventral horn function
Motor neurons
Lamina 1 function
Noxious (pain) sensation + thermal stimuli
Lamina I associated spinal tracts
Spinothalamic tracts
Lamina II function
Sensation, non-noxious stimuli, + pain interpretation
Lamina VII general spinal segments
C8-L3, T1-L2, S2-S4
Lamina VII function
Autonomic system
Lamina VII associated spinal tract
Dorsal spinocerebellar tract
Lamina VIII function
Motor output to skeletal muscles
Lamina IX function
Motor neurons that innervate skeletal muscle
Dorsal nucleus of Clarke spinal segments
C8-L3
Dorsal nucleus of Clarke tract function
Form dorsal spinocerebellar tracts ipsilaterally
Dorsal nucleus of Clarke associated lamina
VII
Sacral autonomic spinal segments
S2-S4
Sacral autonomic function
Parasympathetic neurons
Sacral autonomic associated lamina
Lamina VII
Interomediolateral cell columns spinal segments
T1-L2
Interomediolateral cell columns function
Sympathetic neurons
Interomediolateral cell columns associated lamina
Lamina VII
Alpha neurons function
Muscle contraction
Gamma neurons function
Muscle proprioception
Alpha neurons associated lamina
Lamina IX
Gamma neurons associated lamina
Lamina IX
Phrenic nucleus spinal segments
C2-C5
Phrenic nucleus function
Innervation the diaphragm
Phrenic nucleus associated lamina
Lamina IX
Spinal accessory nucleus spinal segments
C1-C5
Spinal accessory nucleus function
Innervates trapezius + SCM muscles
Spinal accessory nucleus associated lamina
Lamina IX
Nucleus of onuf spinal segments
S1-S2
Nucleus of onuf function
Innervate muscles of pelvic floor
Nucleus of onuf associated lamina
Lamina IX
Where does DCML tract start?
Dorsal column
Where does ventral spinothalamic tract start?
Spine (DRG)
Where does lateral spinothalamic tract start?
Spine (DRG)
Where does ventral spinocerebellar tract start?
Spine
Where does dorsal spinocerebellar tract start?
Clarke’s nucleus in spine
Where does lateral corticospinal tract start?
Primary motor cortex
Where does ventral corticospinal tract start?
Primary motor cortex
Where does medial vestibulospinal tract start?
Medial pons
Where does lateral vestibulospinal tract start?
Lateral pons
Where does rubrospinal tract start?
Red nucleus
Where does tectospinal tract start?
Tectum in midbrain
Where does tectospinal tract end?
Cervical spine
Where does rubrospinal tract end?
Spine
Where does lateral vestibulospinal tract end?
Lamina 7 in spine
Where does medial vestibulospinal tract end?
Lamina 7 in spine
Where does ventral corticospinal tract end?
Lamina 9, spine
Where does lateral corticospinal tract end?
Lamina 9, spine
Where does dorsal spinocerebellar tract end?
Cerebellum- inferior peduncles
Where does ventral spinocerebellar tract end?
Cerebellum- superior peduncles
Where does lateral spinothalamic tract end?
Thalamus
Where does ventral spinothalamic tract end?
Thalamus
Where does DCML tract end?
Somatosensory cortex
DCML tract number of neurons
3
Spinothalamic tracts number of neurons
3
Spinocerebellar tracts number of neurons
2
Corticospinal tracts number of neurons
2
Vestibulospinal tracts number of neurons
2
Rubrospinal tract number of neurons
2
Tectospinal tract number of neurons
2
DCML tract decussation
Yes at medulla
Ventral spinothalamic tract decussation
Yes at level of entrance
Lateral spinothalamic tract decussation
Yes at level of entrance/lissauer’s tract
Ventral spinocerebellar tract decussation
Yes, DOUBLE CROSS
Dorsal spinocerebellar tract decussation
No
Lateral corticospinal tract decussation
Yes at medulla. 85% decussate
Ventral corticospinal tract decussation
Technically no but 15% decussate
Medial vestibulospinal tract decussation
NO
Lateral vestibulospinal tract decussation
NO
Rubrospinal tract decussation
Yes, immediately
Tectospinal tract decussation
Yes, immediately
DCML fasciculus cuneatus function
Conscious proprioception, discriminative touch, + vibration in UPPER LIMBS
DCML fasciculus gracilis function
Conscious proprioception, discriminative touch, + vibration in LOWER LIMBS
Ventral spinothalamic function
Light touch + pressure
Lateral spinothalamic function
Pain + temperature
Ventral + dorsal spinocerebellar function
Unconscious proprioception
Lateral corticospinal function
Voluntary motor of limbs
Ventral corticospinal function
Voluntary motor of axial musculature
Medial Vestibulospinal function
Stabilizes head + eye movements
Lateral Vestibulospinal function
Maintain balance + posture. Anti-gravity muscles. Dieter’s nucleus
Rubrospinal function
Fine motor control of flexors of upper limbs + posture in cervical
Tectospinal function
Reflexive head + neck movement in response to stimuli
Sensory or motor? DCML cuneatus
Sensory
Sensory or motor? DCML gracilis
Sensory
Sensory or motor? Ventral spinothalamic
Sensory
Sensory or motor? Lateral spinothalamic
Sensory
Sensory or motor? Ventral spinocerebellar
Sensory
Sensory or motor? Dorsal spinocerebellar
Sensory
Sensory or motor? Lateral corticospinal
Motor
Sensory or motor? Ventral corticospinal
Motor
Sensory or motor? Medial vestibulospinal
Motor
Sensory or motor? Lateral vestibulospinal
Motor
Sensory or motor? Rubrospinal
Motor
Sensory or motor? Tectospinal
Motor
