Descending Motor Pathways Flashcards Preview

Thought, Sense and Movement > Descending Motor Pathways > Flashcards

Flashcards in Descending Motor Pathways Deck (20)
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1
Q

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

A
Paralysis
Paresis
Reflex loss
Fibrillations
Fasciculations
2
Q

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

A

Fine movements (e.g fingers)

3
Q

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

A

Positioning

4
Q

What is the function of the lateral corticospinal tract?

A

Voluntary control of distal musculature (controls fine movements)

5
Q

What is the function of the anterior corticospinal tract?

A

Voluntary control of proximal musculature (controls position)

6
Q

What is the function of the reticulospinal tract?

A

Regulate flexor muscle reflexes and initiate patterned activity (locomotion)

7
Q

What is the function of the rubrospinal tract?

A

Motor control; excitement of flexors

8
Q

What is the function of the tectospinal tract?

A

Mainly cervical termination, orientation to visual stimuli

9
Q

The superior caliculi is associated with what?

A

Visual

10
Q

The inferior caliculi is associated with what?

A

Auditory

11
Q

What is the function of the vestibulospinal tract?

A

Lateral controls anti-gravity muscles

Medial regulates head movements

12
Q

Where does the lateral corticospinal tract cross over?

A

At pyramidal decussation

13
Q

Where does the anterior corticospinal tract cross over?

A

At segmental level of spinal cord

14
Q

Corticobulbar tract innervates which cranial nerves?

A

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

15
Q

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

A

Positive Babinski Sign

16
Q

Describe the Babinski sign?

A

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

17
Q

Lesions above the red nucleus lead to which condition?

A

Decorticate posturing (hyper flexion of upper extremities)

18
Q

Lesions below the red nucleus lead to which condition?

A

Decerebrate posturing (hyper extension of upper extremities)

19
Q

Describe the route the Pontine recticulospinal tract takes?

A

Ipsilateral

20
Q

Describe the route the Medullary reticulospinal tract takes?

A

Both contralateral and ipsilateral