What is the somatotopic map rule, and what is the exception in major pathways? (2)
Rule: upper body medial, lower body lateral EXCEPT
- Posterior columns: arms added on laterally as you go higher
- Legs are medial in the cortex for motor and sensory
What is the vessel that provides the major blood supply to the lumbar and sacral cord?
What area in the spine is the most vulnerable?
Great radicular artery of Adamkiewicz supples lumbar and sacral cord.
T4-T8 is vulnerable area (watershed)
Name the major motor tract and key nuclei:
- bilateral axial girdle muscles
- head/neck position
- balance
- automatic posture and gait movements
- coordination of eye/head movements
- anterior CST
- Vestibulospinal tracts: Medial VST
- Vestibulospinal tracts: Lateral VST
- Reticulospinal tracts: pontine and medullary reticular formation
- Tectospinal tract: superior colliculus - dorsal tegmental midbrain decussation
What is the positioning of face, arm, leg in the internal capsule?
Face is anterior
Arms and legs are posterior
Position of corticobulbar and corticospinal fibers in basis pedunculi in midbrain? What part of the basis pedunculi and in what order?
In Basis pedunculi in midbrain, the fibers are in the middle 1/3 and from medial –> lateral: (medial) face –> arms –> legs (lateral)
Parasympathetic cranial nerves?
3, 7, 9, 10
Localization for hemiparesis / hemisensory loss of vib/jp, and opposite side tongue weakness?
Medial medullary lesion
Localize: Brown-sequard plus decreased facial sensation
high cervical lesion with involvement of spinal trigeminal nucleus and tract
localize gait ataxia
cerebellar vermis, midline cerebellum
