For the posterior column and spinothalamic sensory (ascending) tracts list the f
ID: 3509158 • Letter: F
Question
For the posterior column and spinothalamic sensory (ascending) tracts list the following: Number of neurons involved in the tract from receptor to cerebral cortex Site of decussation (cross-over) Sensory modalities carried: What are the Lower Motor Neurons? What type of paralysis occurs when LMN's are damaged? What are the Upper Motor Neurons? What type of paralysis usually oceurs when UMN's are damaged? Explain your answer! What is the function of the corticobulbar tract? What regions of the brain are involved in the Indirect (Extrapyramidal) motor tracts?Explanation / Answer
1. Three neurons are involved to carry information from periphery to cortex in spinothalamic tract. And also in the posterior column
2. Lower motor neurons: lower motor neurons are located in the either the anterior grey column, anterior nerve roots or the cranial nerve nuclei of the brain stem and cranial nerves with motor function.
Damage to the lower motor neurons can lead to flaccid paralysis, absent deep tendon reflexes and muscle atrophy.
3. Upper motor neurons: These are the motor neurons that originate either in the motor region of the cerebral cortex or in the brain stem.
4. Corticobulbar tract: It is a two neuron white matter motor pathway connecting the motor cortex in the cerebral cortex to the medullary pyramids, which are part of the brainstems medulla oblongata region,and are primarily involved in carrying the motor function of the non oculomotor cranial nerves.
5. Extra pyramidal tracts are mainly found in pons and medulla