Somatosensory (F) Flashcards
What are the different sensory systems (and their fiber type)?
- Olfactory (SVA)
- Taste (SVA)
- Hearing (SSA)
- Vision (SSA)
- Somatosensory (GSA)
What does the sensory system provide that is important for accurate motor movement?
- Joint position
- Muscle tension
- Velocity of muscle movement
- Contact of body with external surfaces
How many laminae are in the Lamina of Rexed? 1. What are they organized based off of? 2
- 10
2. cytoarchitecture
What lamina of the Lamina of Rexed compose the dorsal horn>?
I-VI
What are the very short axons that synapse a few hundred micrometers from the soma in the Lamina of Rexed? 1. Where do the fibers in the Lamina of Rexed project to? 2
- interneurons
2. distant parts of CNS (e.g. thalamus)
Where are somatic motor neurons in the Lamina of Rexed? 1. Where are GVE fibers? 2
- lamina IX
2. lamina VII
What are the three major divisions of the spinal cord white matter?
- Dorsal Funiculus
- Lateral Funiculi
- Ventral Funiculus
What are the three major divisions of the spinal cord white matter?
- Dorsal Funiculus
- Lateral Funiculi
- Ventral Funiculus
What is the dorsal funiculus divided into? 1. What separates these two sections? 2
- fasciculus gracilis and fasciculus cuneatus
2. posterior median sulcus
What separates the sections of the ventral funiculus? 1. What connects the sections? 2
- deep anterior median fissure
2. ventral white commissure
Where do the sensory tracts run within the brainstem?
tegmentum
What is the only sensory info that does not go through the thalamus?
olfactory
What cortical layer does feedback to the thalamus come from?
layer 6
What are the specific nuclei in the thalamus that project to discrete cortical areas?
- VPL
- VPM
- VPI
- VPS
What are the specific nuclei in the thalamus that project to discrete cortical areas?
- VPL
- VPM
- VPI
- VPS
Is damage to the red nucleus more likely to affect the fasciculus cuneatus or gracilis?
cuneatus because it is closer
Is damage to the red nucleus more likely to affect the fasciculus cuneatus or gracilis?
cuneatus because it is closer
What is a transection of half of cord at any level called? 1. What is the result? 2
- Brown Sequard
2. loss of ipsilesional DC and contralesional ALS from lesion site down
What is a transection of half of cord at any level called? 1. What is the result? 2
- Brown Sequard
2. loss of ipsilesional DC and contralesional ALS from lesion site down
What are two other names for the Trigeminal Ganglion (V)? 1. Where is the ganglion located? 2
- Semilunar ganglion and Gassarian ganglion
2. floor of middle cranial fossa
What are two other names for the Trigeminal Ganglion (V)? 1. Where is the ganglion located? 2
- Semilunar ganglion and Gassarian ganglion
2. floor of middle cranial fossa
Where do all central fibers (GSA fibers) synapse?
Trigeminal Sensory Nucleus
What are the sections of the Trigeminal Sensory Nucleus?
- Mesencephalic
- Pontine (chief)
- Spinal
What Trigeminal Sensory Nucleus section is responsible for proprioception for face and jaw?
mesencephalic
