Exam 2 Spinal cord interior Flashcards
What are collections of axons grouped together in the CNS called?
Tracts
Afferent tracts are usually____ & efferent tracts are _____?
Sensory & Motor
What is the main sensory pyramidal tract called & pass through what?
Dorsal column passing through the Medial Lemniscus system
Pain sensory signals are sent through what system?
Spinothalamic (Anterolateral) system
The spinocerebellar tracts send what kind of signal to where?
Signals about movement & body position to the cerebellum
What are the 3 afferent pyramidal tracts called?
Dorsal column Medial Lemniscus system, Spinocerebellar tracts, & Spinothalamic (Anterolateral System)
Sensory information enters the _____ part of the spinal cord & motor exits through the____.
Dorsal & anterior
The Spinal nerve becomes the spinal ____, which then become the _____, which enter the spinal cord.
Root & rootlets
Lamina 1 is in the ____ area of the spinal cord and transmits what kind of signal?
Dorsal & fast/sharp pain
A-Delta neurons send what kind of signal?
Fast/sharp pain
What is a nickname for Lamina 1?
Lamina Marginalis
Slow pain is sent through what Laminae?
Laminae 2, 3, & 5
What is another name for Laminae 2 & 3?
Substantia Gelatinosa
Slow pain is sent through what kind of fibers?
C-fibers
Which Laminae receive sensory input such as pressure, stretch, position?
Laminae 1 thru 6
Where is Lamina 8 located & what is its function?
In the anterior horn send information for muscles to contract
What signals are sent through the DCML?
High fidelity like finger pressure, vibrations
Do signals entering the DCML cross over?
Yes, but no as they enter the spinal cord. They cross over at the Lower Medulla Oblongata
The DCML is divided into what to parts?
Fasciculus gracilis & Fasciculus cuneatus
The Fasciculus cuneatus sends _____ extremity info & the Fasciculus gracilis send _____extremity info.
Upper & lower
Where is the crossover for the DCML pathway?
The Lower medulla oblongata
Where is the Medial Lemniscus located?
In the PONS
Which 2 body parts take up most space in the Homunculus diagram?
Facial & hands
Delineate a lower body sensory DCML pathway.
Sensory enters the Fasciculus gracilis then ascends on same side it entered, then crosses over at the medulla oblongata, then travels the Medial Lemniscus pathway to the thalamus.
