Nuro tracts - Osmosis A+D Flash cards
What are the two main types of spinal tracts ?
Ascending and Descending
What type of information do the ascending spinal tracts send?
Sensory
Which part of the spinal tract is the grey matter ?
The Butterfly shape in the centre
Where do the Ascending tracts orginate ?
- Begin in the spinal cord
- Travel in the white matter to the brain
- made up of three nueron chains
What are the three ascending tracts?
- Dorsal column tract
- Spinothalamic tract
- Spinocerebellar tract
What type of sesnory infromation does the dorsal column - medial leminiscus tract carries ?
- Carries fine touch, vibration and prociception.
What type of sensory infromation does the spinothalamic tract carry?
- Transmits pressure, crude touch, pain, and temperature.
Where inthe spinal cord does information from the spinothalamic tract start to travel ?
Anterior - Pressure and Crude touch
Lateral - Pain and temperature
Which part of the white matter contains motor nuerons and which containes sensory nuerons ?
White matter
* Anterior funiculus contains motor neurons.
- Posterior funiculus contains sensory neurons.
- Can be divided further into:
- Fasciculus gracilis
- Fasciculus cuneatus
- Lateral funiculus conveys a mixture of sensory and motor information
Does the sensory infromation travel through dorsal or ventral root to reach the spinal cord ?
dorsal
Does the motor information travel through the dorsal or ventral root to reach the effector ?
ventral
Where does the spinothalamic tract decussate
- The fibres decussate as soon as they enter the spinal cord and ascend contralaterally.
Where does the dorsal medial lemniscal pathway decusate ?
The root fibres remain ipsilateral and do not decussate until they reach the medulla of the medulla of the brain stem.
