Unit 1: Spinal Cord Neuroanatomy Flashcards
L1: ________ secondary neurons cross the midline in the spinal cord.
Pain and Temperature sensation
L1: Lower Motor Neuron syndrome is classified as _____ paresis.
Flaccid
L1: Second-order pain/temperature sensory neurons synapse with a third-order neuron in the ______.
Ventral Posterolateral Nucleus of the Thalamus
L1: Soma of primary sensory neurons reside in the ______.
dorsal root ganglion
L1: The third-order sensory neuron innervates the _______.
Primary sensory cortex
L1: Upper Motor Neuron syndrome is classified as ______ paresis.
Spastic
L1: Vibration/Proprioception second-order sensory neurons synaps with a third-order neuron in the _______.
Ventral Posterolateral Nucleus of the Thalamus
L2: ___% (the majority) of corticospinal fibers decussate in the _______.
80; medullary pyramid
L2: Axons in the lateral corticospinal tract arise on the _______ side of the cortex.
contralateral
L2: Axons in the lateral corticospinal tract synapse in the _______.
Ventral gray matter of the spinal cord
L2: Axons of the primary sensory neuron for pain or temperature enter the spinal cord and ascend or descent in _________.
Lissauer’s fasciculus
L2: Corticospinal fibers that do not decussate in the medulla cross the midline via the ________.
Ventral white commissure
L2: Pain or temperature primary sensory neurons synapse at the _______. (___ matter of the _____ horn)
Substantia gelatinosa; gray; dorsal
L2: Pelvic splanchnic preganglionic parasympathetic fibers are found in the _______
Lateral gray horn T12-L1
L2: The fasciculus gracilis carries fibers for the _____ extremity and is located more _______.
Lower; medially
