Random Stephens Stuff Flashcards
What does a posterior column lesion on the right side result in, in general?
Right sided Loss (ipsilateral) of proprioception discriminative touch and vibratory touch below the lesion
page 195
What artery is associated with lateral medulla lesions?
Posterior inferior cerebellar artery PICA syndrome
pg 196
Unilateral lesion of FG results in what?
Ipsilateral loss of proprioception, vibratory sensation, and 2 point tactile discrimination in the lower half of the body and extremeties
- Associated with posteior spinal artery
Unilateral lesion of FC results in what?
Unilateral loss of proprioception 2 pt discrimination and vibratory sense on the same side as the lesion on the upper half of the body.
- assocaited with posterior spinal artery
What are symptoms of Lateral Corticospinal Tract lesions in the spinal cord?
- Ipsilateral spastic paralysis
- Hyperreflexia
- Hypertonia
- Babinski sign
- Clonus
- Disuse atrophy
(These are upper motor neuron damage signs)
Both anterior and posterior spinal arteries according to diagram in Somatosensory tract 2 lecture
Lateral Spinothalmic Tract (LSTT) unilateral lesion symptoms?
- contralateral loss of pain and temprerature sensation two sensory dermatome segments below the level of the lesion
- Long circumfrential branches of basilar artery and branches of the AICA associated with this
What happens if the Lateral Reticulosopinal Tract is transceted?
- Transection above S2 interrupts LRST to sacral autonomic nucleus and the patient loses their ability to voluntarily void their bladder, so urinary retention occurs.
What happens if AWC is damaged?
- Bilateral loss of pain and temp to upper extremeties
Syringomyelia?
- Central cord syndrome caused by syrinx or intramedullary mass or infarct. Occlusion of Great anterior artery aka Artery of adamkiewicz
- also damages AWC
What results with damage to the Anterior horn?
- LMN paralysis from destruction of the lower motor neurons or their axons.
- It is seen with flaccid paralysis areflexia atonia atrophy and fasciculations
- Anterior spinal artery supplies this area
What does the spinal lemniscus do?
- Conveys pain and temp from the opposite half of the body. It is lateral or posterolateral to the medial lemniscus
What does the Medial Lemniscus do?
- Conveys proprioceptive vibratory and 2 point tactile discrimation from the opposite half of the body.
- At the upper pons and mmidbrain the ML has fibers that convey taste from ipsilateral tongue and pharynx
What does the trigeminal lemniscus do?
- Conveys pain temp and crude sensations from opposite half of the face
What does the descending tract of trigeminal do?
- Conveys ipsilateral paon and temp form the face. Located in posterolateral area of medulla.
- Descending tract of V and underlying descending nucleus of V are adjacent to the spinal lemniscus
Lateral Lemniscus?
LL conveys bilateral auditory info but mostly info from the opposite side. Located in lateral brainstem
MLF (Medial longitudinal Fasciculus) functions
- Conveys vestibular info from maculae utricle and sccule and crista ampullaris to CN III IV and VI.
- Critical role in aligning gaze with the heads position and its located next to the midline and anteiro to central grey
- In the medulla and lower pons it is located at dorsal medial lemniscus
MLF lesion results in?
- Results in internuclear opthalmoplegia. Abnormal respponse to horiozontal gaze in direction opposite of the lesion.
- Unioateral lesions of the MLF result in imparitment or loss of of adduction of ipsilateral eye and nystagmus of the abducting eye
Corticospinal Tract (CST) function location
- Conoveys descending motor info from motor cortex
- In the midbrain it makes up middle of the crus cerebri
- In pons its split into fascicle by pontine nuclei and pontocerebellar fibers
- Medulla it forms pyramids
CST unilateral lesion?
Contralateral spastic hemiplegia
Fibers decusate in the medulla in the pyramids
Corticobulbar tract function and location?
- Brainstem cranial nerve motor nuclei innervated by corticobulbar fibers!
- They decusate in the lower pons btw trigeminal and abducens
Unilateral lesions of CBT?
- Denervation of brainstem motor nuclei below lesion
Unilateral Lesions of CBT above decussation level? Below?
- Contralateral paralysis of lower half of face Supranuclear Facial Palsy
- Lesions below decussation result in ipsilateral cranial nerve palsies
