Descending Motor Pathways Flashcards Preview

Thought, Sense and Movement > Descending Motor Pathways > Flashcards

Flashcards in Descending Motor Pathways Deck (20):
1

Damage to upper motor neurones can result in what 5 symptoms?

Paralysis
Paresis
Reflex loss
Fibrillations
Fasciculations

2

In the ventral horn of the spinal cord, distal musculature controls what?

Fine movements (e.g fingers)

3

In the ventral horn of the spinal cord, proximal and axial musculature controls what?

Positioning

4

What is the function of the lateral corticospinal tract?

Voluntary control of distal musculature (controls fine movements)

5

What is the function of the anterior corticospinal tract?

Voluntary control of proximal musculature (controls position)

6

What is the function of the reticulospinal tract?

Regulate flexor muscle reflexes and initiate patterned activity (locomotion)

7

What is the function of the rubrospinal tract?

Motor control; excitement of flexors

8

What is the function of the tectospinal tract?

Mainly cervical termination, orientation to visual stimuli

9

The superior caliculi is associated with what?

Visual

10

The inferior caliculi is associated with what?

Auditory

11

What is the function of the vestibulospinal tract?

Lateral controls anti-gravity muscles
Medial regulates head movements

12

Where does the lateral corticospinal tract cross over?

At pyramidal decussation

13

Where does the anterior corticospinal tract cross over?

At segmental level of spinal cord

14

Corticobulbar tract innervates which cranial nerves?

V - Trigeminal
VII - Facial
XI - Accessory
XII - Hypoglossal

15

How can upper motor neurones damage (corticospinal) be identified?

Positive Babinski Sign

16

Describe the Babinski sign?

Abnormal fanning of toes and extension of big toe. Plantar flexion occurs as opposed to normal dorsiflexion

17

Lesions above the red nucleus lead to which condition?

Decorticate posturing (hyper flexion of upper extremities)

18

Lesions below the red nucleus lead to which condition?

Decerebrate posturing (hyper extension of upper extremities)

19

Describe the route the Pontine recticulospinal tract takes?

Ipsilateral

20

Describe the route the Medullary reticulospinal tract takes?

Both contralateral and ipsilateral