Medulla Flashcards
dorsal column/medial lemniscal system
Fasciculus gracilis synapse with ____ afferents in ____
2° afferents in Nucleus Gracilis
dorsal column/medial lemniscal system
Fasciculus cuneatus axons synapse with ____
Nucleus Cuneatus
dorsal column/medial lemniscal system
Crossing Axons of both sets of DCML 2° afferents form ____
Internal Arcuate Fibers (crossing fibers)
Axons forming Internal Arcuate Fibers cross to the opposite site via….
the Great Sensory Decussation
What forms the Medial Lemniscus?
Tract of 2° afferents carrying deep sensibility from the contralateral half of the body (DCML)
When internal Arcuate fibers cross the great sensory decussation they form ____
Medial Lemniscus
Spinocerebellar tracts carry ____ from the ____
Proprioception from the lower body
Dorsal spinocerebellar tract enters the cerebellum via ____
The inferior cerebellar peduncle
Ventral spinocerebellar tract enters the cerebellum via ___
The superior cerebellar peduncle
What crosses at the great sensory decussation?
Internal Arcuate fibers (DCLM)
pain & temperature from ipsilateral face & other areas of the head enter the ____
spinal tract of the trigeminal nerve (CN V)
pain & temperature from the face
1° axons from the spinal tract of the trigeminal nerve synapse with ____ in the ____
secondary afferents in the nucleus of the spinal tract of trigeminal
pain & temperature from the face
secondary axons cross the midline to form the ____
trigeminal lemniscus
trigeminal lemniscus ends at the ____
thalamus
what carries pain & temperature from the contralateral side of the body to the thalamus?
spinothalamic tracts
spinothalamic tracts carry ____ neurons for ____
secondary afferent neurons for pain & temperature
the pyramid contains ____ to the ____ half of the body
corticospinal fibers (UMNs) to the contralateral side of the body
at the pyramidal decussation, ____% of fibers cross to form the ____
85%
lateral corticospinal tract
at the pyramidal decussation, ____% of fibers do not cross, and form the ____
15%
ventral corticospinal tract
tract connecting cranial nerve nuclei and autonomic centers to coordinate vestibular input & head, neck, and eye movements
connects cranial nerves that move the eyes
medial longitudinal fasciculus (MLF)
medial longitudinal fasciculus is involved in ____
conjugate horizontal eye movements (eyes move in synchrony)
lesion to medial longitudinal fasciculus causes ____
internuclear opthalmopegia
eyes cannot move in synchrony
synchronous eye movement requires coordination through the ____
medial longitudinal fasciculus
diffuse area in the brainstem with small nuclei and fibers
reticular formation
