PT - Spinal cord and Root disease Flashcards
Damage to dorsal spinal root.
Sensory deficits, presenting w/ areflexia
Hemisection of spinal cord.
Contralateral loss of pain and thermal sensation due to spinothalamic damage, ipsilateral loss of proprioception due to posterior column damage. Also ipsilateral motor paralysis due to destruction of the corticospinal and rubrospinal tracts.
Transection of spinal cord.
Bilateral spastic paralysis, no sensory below the transection.
Path of primary sensory fibers in dorsal column.
Primary sensory fibers enter spinal cord –> ascend via dorsal column (legs/trunk travel medially via F. gracilis vs. arm/neck travel laterally via F. cuneatus) –> synapse in medulla, 2nd order neurons decussate as internal arcuate fibers –> ascend contralaterally in medial lemniscus to VPL (thalamus ) –> Sensory cortex
Artery of Adamkiewicz supplies.
Lower 2/3 of spinal cord and enters around T10-L1.
If syrinx increases significantly in size, what can it affect and how would it present?
Affect spinothalamic tract fibers FIRST while they crossing via the anterior spinal commissure (B/L loss of pain/temp in cap distribution) –> knock out anterior horns (p/w LMN sxs like muscle atrophy, weakness, hyporeflexia) –> knock out lateral horn (Horner’s syndrome 2/2 sympathetics knocked out)
Interosseous muscles of hand innervated by.
Ulnar nerve (C8-T1 roots)
Lumbrical muscles of hand innervated by.
Medial nerve for middle finger and pointer, Ring finger + pinky are innervated by ulnar.
Function of Interosseous muscles.
Adduction and abduction of fingers.
Function of Lumbricals of hand.
Extension of digits
S mansoni is endemic where? Ovum can be found in what part of the body?
Puerto rico + South America, Spinal cord, Ovum has spine extending on one side
Lateral corticospinal tract pathway.
Precentral gyrus –> posterior limb of internal capsule –> middle section of cerebral peducle –> basal pons –> pyramid of medulla site of decussates –> contralateral down spinal cord to level.
