Spinal Cord & PNS (Mixed) Flashcards
Type of Matter:
- Sensory tracts
- Discrimative touch
- Conscious proprioception
White matter - Dorsal column
Pathway Function: Tectospinal Pathway (White)
Refelxive movement of head
Pathway Function and End Point: Spinothalamic Pathway (White)
F: Conscious pain and temperature
EP: VP of Thalamus
Pathway Function: Lateral Corticospinal Pathway (White)
Primary motor ouput: voluntary movement and fine motor control
MOST CROSS
(Cross in Pyramids)
Pathway Function: Medial Corticospinal Pathway (White)
Same function as Lateral Corticospinal pathway HOWEVER only makes up 10% of total corticospinal pathways
DO NOT CROSS
Function: Nucleus Dorsalis or Clark’s Column (LVII)
Relays unconscious proprioceptive information to cerebellum
Function: Substantia Gelatinosa (LII)
Process pain information
Rexed Laminae: Processes conscious proprioception and discriminative touch
Nucleus Proprius (LIII&IV)
5 Changes in the Spinal Cord as you DESCEND
- Decrease in white matter
- MORE sensory info as you move UP, motor info descends LESS pathways needed lower down - Overall size decreases
- No posterior intermediate sulcus below T2
- Lateral horn from T1-L2
- Anterior horn larger at C&L plexuses
Pathway Function: Reticulospinal Pathway (White)
Trunk movements and postural control
Pathway Function: Dorsal Column Pathway (White)
F: Discriminative touch and conscious proprioception
Rexed Laminae: Processes pain information
Substantia Gelatinosa (LII)
Pathway Function and End Point: Spinoreticular Pathway (White)
F: Alerting/Arousal; Unconscious Pain
EP: Reticular Area
Type of Matter:
- Sensory
- Contains endings of sensory neurons
- Interneurons
- Cell bodies of tract cells
Gray matter - Dorsal horn
Type of Matter:
- Motor
- Cell bodies of LMN
Gray matter - Ventral horn
4 Clinical Signs of UMN Injury
- Paresis (not complete loss or paralysis - mutliple levels coming down)
- Spasticity
- Hypertonia
- Hyperreflexia
Pathway Function: Vestibulospinal Pathway (White)
Trunk movements and postural control
Pathway Function and End Point: Spinocerebellar Pathway (White)
F: Unconscious Proprioception
EP: Cerebellum
Pathway Function: Rubrospinal Pathway (White)
Gross motor movements under voluntary control
Rexed Laminae: Relays unconscious proprioceptive infromation to cerebellum
Nucleus Dorsalis or Clark’s Column (LVII)
Location: Where rubrospinal pathway begins
Red Nucleus of Upper Midbrain
(Crosses Immediately)
Type of Matter:
- From T1-L2
- Cell bodies of preganglionic sympathetic neurons
Gray matter - Lateral horn
Type of Matter:
- Motor tracts
- Postural regulation
White matter - Anterior column
Function: Nucleus Proprius (LIII&IV)
Processes conscious proprioception and discriminative touch
4 Clinical Signs of LMN Injury
- Loss of reflexes or Hyporeflexia
- Atrophy
- Flaccid paralysis
- Fibrillations/Fasciculations