Cord Syndromes Flashcards
1
Q
Gimme the sensory pathways and modalities
A
Spinothalamic Tracts: Pain, Temp, Pressure, Crude Touch
- 1st Dorsal Root Ganglion, synapse at Dorsal Horn
- 2nd Order Neuron decussates @ Spinal Cord
- Travels upwards anteriorly
- 3rd Order Neuron at Thalamus, then posT-central gyrus
DCML: Proprioception, Vibration, Fine Touch, Pressure
- 1st Dorsal Root Ganglion, synapse at MEDULLA Oblongata
- Travels upwards at Dorsal Column
- 2nd Order Neuron decussates @ MO
- 3rd Order Neuron at Thalamus, then pOSTcentral gyrus
2
Q
Gimme the motor pathway
A
Corticospinal (Lateral Tract)
- UMN motor cortex
- Decussate at Medulla Oblongata (Pyramidal Tract)
- then descends laterally
- Synapse w LMN at Anterior Horn Cell
3
Q
Give functions of CN5 CN7 CN9 CN10 CN12
Note that for cranial nerves almost all have contralateral UMN influence
- except for lower half of face of CN7 LMNs
A
CN5:
- Face sensation, Apex Ear Chin line
- Mastication
CN7:
- Expression
- Chorda Tympani - Otic Ganglion; All glands except Parotid
- Anterior 2/3 of Tongue taste
CN9:
- Tympanic Nerve - Lesser Petrosal Nerve, Parotid Gland, Posterior 1/3 of Tongue taste
- Stylopharyngeus
CN10: largynx, gag reflex
CN12: Tongue
4
Q
Anterior Cord Syndrome
- Causes
- Presentation
A
Anterior Spinal Artery thrombosis
- come from 2 vertebral arteries
- Motor gone
- Spinothalamic gone
- DCML good
- bilateral hemiparesis + bilateral loss of pain, temperature; DCML spared
5
Q
Posterior Cord Syndrome
- Causes
- Presentation
A
Syphilis - Tabes Dorsalis
B12 deficiency
2 Posterior Spinal Arteries gone
- Motor gone
- Spinothalamic GOOD (at the level maybe gone also cos of decussating entry of 2nd sensory)
- rest travelling by anterior spinothalamic pathway
- DCML gone
6
Q
Hemisection aka Brown Sequard Syndrome
A
- Ipsilateral DCML gone
- Ipsilateral Motor gone
- Contralateral Sensory gone
– if have trouble just trace travelling pathway!
