Spinal Tracts Flashcards
[Sensory Modality]
What carries fine touch?
Anterior Spinothalamic Tract
[Sensory Modality]
What carries fine touch?
Anterior Spinothalamic Tract
[Sensory Modality]
What carries pain and temperature?
Lateral Spinothalamic Tract
[Sensory Modality]
What carries proprioception and vibration sense?
Dorsal Columns
What composes the posterior column tract?
Fasciculus gracilis
Fasciculus cuneatus
[Transmits Information From?]
Fasciculus gracilis
Fasciculus cuneatus
Information from areas inferior to T6
Information from areas superior to T6
Which is more medial? Fasciculus gracilis or cuneatus?
Gracilis, because it is lower, as taught that neurons that enter earlier are pushed medially
What are the second order neurons of the fasciculus gracilis and cuneatus?
Where are they found?
They cross over and enter what?
Nucleus Gracilis
Nucleus Cuneatus
They are found in the medulla oblongata
Medial Lemniscus
Third order neurons are always found?
Thalamus
Final destination of neurons is always?
Primary Sensory Cortex
First order neurons are always found?
Dorsal Root Column
Rubbing on the arm alone is wrong for checking because?
It only tests the anterior spinothalamic tract, it is not testing the lateral one which detects heat and pain. So poke them with a pin.
What are the 3 Major Spinal Tracts?
- Dorsal Column
- Spinothalamic
- Spinocerebellar
What is the convention for naming Spinal Tracts?
Naming Tracts:
If it begins with “spino” the tract is sensory (From spinal cord -> X)
If it ends with “spinal”, the tract is motor (Information from X -> Spinal Cord)
Stimulation of lower-motor neurons has an [excitatory/non-excitatory]? effect on the skeletal muscle fibers
Excitatory
Lower motor neurons always start at?
Anterior Horn
What are the two major motor tracts?
Corticospinal Tract
Subconscious Tract
Function: Corticospinal Tract
Conscious control of skeletal muscles
Function: Subconscious Tract
Subconscious regulation of balance, muscle tone, eye, hand, and upper limb position
What are the two types of corticospinal tracts?
What are their functions?
Lateral: Controls limbs
Anterior: Controls axial skeleton
Corticospinal Tracts consist of three pairs of descending tracts, what are they?
Corticobulbar Tract
Lateral Corticospinal Tract
Anterior Corticospinal Tract
Functions of the Three Pairs of Descending Tracts
Corticobulbar: Conscious control over eye, jaw, and face muscles
Lateral Corticospinal: Conscious control over skeletal muscles of the limbs
Anterior Corticospinal: Conscious control over the axial skeleton
[T/F]
All anterior corticospinal nerves decussate (cross over)
F
[Subconscious Motor Tract]
What are the four tracts?
Vestibulospinal
Tectospinal
Reticulospinal
Rubrospinal
[Test Maybe Question: Which one of these are not a subconscious tract]
