Unit 4 Neuro PP

Question 1

What are upper motor neurons?

Answer 1

Efferent pathways primarily relaying information from the cerebrum to the brain stem or spinal cord. Synapse with interneurons.

Question 2

What are lower motor neurons?

Answer 2

Neurons having direct influence on muscles​
Cell bodies originate in the gray matter of the spinal cord, but their axons extend into the PNS

Question 3

What is the lateral corticospinal track involved in?

Answer 3

gross motor movement

Question 4

What is the extrapyramidal pathway?

Answer 4

pathway by which motor signals are sent from the brain to lower motor neurons

Question 5

At what level does the motor signal cross over in the corticospinal tract?

Answer 5

At the level of medulla

Question 6

What purpose does the anterior and lateral spinothalmic tract serve and how?

Answer 6

To transmit pain and temperature. Sensory neuron impulse enters p. cord, is transmitted across an interneuron and crosses to lat spinothalmic tract

Question 7

Describe the role of the posterior dorsal columns

Answer 7

Transmits light touch and propioception (position of body relative to space). ascends posterior tract on same side, crosses at level of medulla

Question 8

light coma

Answer 8

some purposeful movement upon stimulation

Question 9

coma

Answer 9

no purposeful movement, even with stimulus

Question 10

deep coma

Answer 10

completely unresponsive