Medulla Flashcards
(22 cards)
What syndrome occurs when the PICA is occulded?
Wallenberg syndrome/Lateral Medullary
What is the blood supply for the medulla?
Vertebral Artery
Anterior Spinal Artery
PICA
Where is the vomiting center?
Area Postrema in the medulla
outside the BBB
What structures are injured in medial medullary syndrome?
1) Corticospinal tract
2) Medial leminscus
3) Hypoglossal nucleus
What is the deficet for a corticospinal tract lesion?
Contralateral spastic hemiparesis
WHat is the defiect for a medial lemincus lesion?
Contralteral loss of tatile, vibrationalm and propioceptive sense from TRUNK and EXTREMITIES
What is the defiect from a hypoglossal lesion?
Ispsilateral falccid hemiparaylsis of the tongue
tongue points TOWARD side of the lesion
Where are the lesions associated with Lateral MEdullary/Wallenberg syndrome?
1) Vestibular nuceli
2) Inferior cerebellar peduncle
3) Ambigous
4) Spinothalamic tract
5) Spinal V nucelus
6) Descending sympathetic tract
What is the deficit of a vestibular nuceli lesion?
Nystagmus
Vertigo
What is the defiect of a inferior cerebellar peduncle lesion?
Ipsilateral cerebellar signs
1) Disequilibrium: loss of balance, truncal, and gait ataxia
2) Dyssynergia: Loss of coordination
3) Hypotonia
WHat is the defiect of a nucleus ambigous lesion?
Dysarthia
Hoarsness
Dusphagia
Loss of gag reflex
WHat is the deficiet for a spinothalamic tract lesion?
Contralateral loss of pain and temp in TRUNK and EXTREMITIES
What is the deficiet of a CN V nucelus and tract lesion?
Ipsilateral loss of pain ad temperature sensation in the face
What defiect occurs from a descending sympathetic tract lesion?
Ipsilateral Horner syndrome Ptosis Miois No sweating sunken eyeball
Where is the retiucular formation?
Medulla
What happens in the medulla when receptors pick up low blood pH?
The reticular formation activated—->phrenic nerve—-> contraction of the diaphragm—–>inspiration
What is the deficet of a lesion in the reticular formation?
Resipitory depression
decreased response to hypercapnia
What regulates repistory in medulla?
REticular formation
WHat causes coma?
Disruption of reticular formation from lesions or changes in the NTs
What are the common injuries to the reticular formation?
Neck trauma
Tumor
Cerebellar herniation: increased ICP
How does a lesion in the medulla affect BP?
Hypotension
Orthopnea
What are common occulsions causing medial medullary syndrome?
Vertrbral artery
Basicial artery
