Page 749 - TNFlipTest

Toronto Notes 2019
Basic Anatomy Review
Neurology N7
Thalamus (VP nucleus)
Nucleus cuneatus
Fasciculus cuneatus
Input from upper limb
Dorsal root ganglion
Input from lower limb and trunk
Sensory cortex (lower limb and trunk)
Sensory cortex (upper limb)
Putamen
Internal capsule
Medial lemniscus
Internal arcuate fibres Nucleus gracilis
Fasciculus gracilis
Sensory cortex
Thalamus (VP nucleus)
Dorsal root ganglion
First-order sensory neuron
Third-order sensory neuron
Putamen
Internal capsule
Spinal lemniscus Spinothalamic tract
Second-order sensory neuron
Within 1-2 spinal levels of their entry, axons of first order neurons synapse onto second order neurons, whose axons then decussate before ascending as the spinothalamic tract.
Figure 3. Discriminative touch pathway (dorsal column) from body
Figure 4. Spinothalamic tract from body
Trigeminal ganglion
Input from face
Medial lemniscus (trigeminal lemniscus)
Chief sensory trigeminal nucleus
Trigeminal ganglion
Input from face
Spinal lemniscus (trigeminal lemniscus)
Spinal trigeminal nucleus
Thalamus
Internal capsule
Thalamus
Internal capsule
Figure 5. Discriminative touch pathway (dorsal column) from face
Figure 6. Spinothalamic tract pathway from face
Upper motor neurons in motor cortex
Internal capsule
Medial corticospinal tract
Lower motor neuron
Axial muscles
Decussation of the pyramids (medulla)
Lateral corticospinal tract
Lower motor neuron
Limb muscles
Axial muscles
Pyramids
Sensory cortex face region
Sensory cortex face region
© Merry Shiyu Wang after Dr. P. Stewart 2012
© Merry Shiyu Wang after Dr. P. Stewart 2012 © Barbara Brehovsky after Dr. P. Stewart 2012
© Merry Shiyu Wang after Dr. P. Stewart 2012
© Barbara Brehovsky after Dr. P. Stewart 2012
Figure 7. Corticospinal motor pathway
Tract of the spinal trigeminal nucleus