Ascending Tracts Flashcards
What does the spinal nerve split into
Anterior and posterior root
Which matter is the most myelinated
White
Why would it be more useful to send signals to the brain in white matter
It is more myelinated so it is quicker
Define ganglion
A collection of nerve cells such as neurons and axons in an area
What is the alternative word for posterior column
Medial lemniscal pathway
What is two point discrimination
Your ability to discriminate between two points on the skin
What does the posterior column split into
Fasciculus gracilis - tract of goll
Fasciculus cuneatus - tract of burdach
Which tract in the posterior column is in control of lower limbs
Fasciculus gracilis - tract of goll
Which tract in the posterior column is in control of the upper limbs
Fasciculus cuneatus - tract of burdach
What does ipsilateral mean
The same side
What does contra lateral mean
The different side
Which tracts go to the cerebrum
Posterior column
Spinothalamic
Which tracts go to the cerebellum
Spinoecerebellar (ant & post)
Cuneocerebellar
Which tracts go to the brain stem
Spinoreticular
Spinotectal
Spino - olivary
What does the posterior column detect
Fine touch, vibrations and two point discrimination
What is responsible for lower limbs and trunk
Fasciculus gracilis
What is responsible for upper limbs and trunk
Fasciculus cunneatus
What is the lateral spinothalamic tract responsible for
Pain
Temperature
Which fibres cause slow pain
C fibres
Which fibres cause fast pain
A delta fibres
What is the posterolateral tract of lissauer
What are the order neurons of the posterior column tract
1 - Fasciculus gracils and cunneatus
2 - nucleus gracilis and cunneatus (medulla oblongata)
3 somatosensory cortex in thalamus
What are the order neurons for the lateral spinothalamic tract
1 - dorsal root ganglion / posterolateral tract of lissauer
2 - substantial gelatinosa
3 - ventropposterior lateral nucleus of thalamus
Where do axons cross in the lateral spinothalamic tract
Anterior grey and white commissaries within one spinal segment and ascend in lateral white column
