UMN pathways - old stuff

Question 1

Lateral Corticospinal Pathway

Answer 1

i.

ii. Fractionated movement, voluntary limb movement

Question 2

Anterior (medial) Corticospinal Pathway

Answer 2

axial mm

Question 3

Rubrospinal Pathway

Answer 3

ii. Fractionated UE flexors

Question 4

Tectospinal Pathway

Answer 4

ii. Coordination of neck mvmts w/ eye mvmts, reflexive turning toward stimulus

Question 5

Lateral Vestibulospinal Pathway

Answer 5

ii. Facilitates extensors

Question 6

Medial Vestibulospinal Pathway

Answer 6

ii. Facilitates IPSILATERAL neck LMN, inhibits CONTRALATERAL neck LMN, facilitates UE extensors

Question 7

Lateral (medullary) Reticulospinal Pathway

Answer 7

i. From medullary RF lateral ventral horn on interneurons effecting BILATERAL segmental LMN’s
ii. Inhibit extensors, facilitate flexors

Question 8

Medial (pontine) Reticulospinal Pathway

Answer 8

i. From pontine RF medial ventral horn on interneurons effecting BILATERAL segmental LMN’s (c-spine)
ii. Facilitates UE extensors

Question 9

Changes in Descending Control:

i. Decerebrate posture:

Answer 9

1. Midbrain lesion caudal to red nucleus

2. Lateral vestibulospinal tract is unopposed UE & LE extension

Question 10

Changes in descending control: i. Decorticate posture:

Answer 10

1. Lesion above level of red nucleus

2. Rubrospinal tract influence unopposed UE flexion, LE extension