Final Exam: UMN/LMN Flashcards Preview

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Flashcards in Final Exam: UMN/LMN Deck (34)
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1
Q

UMN and LMN are afferent or efferent

A

efferent (descending)

2
Q

UMN or LMN? cell bodies in CNS

A

Both
UMN: cortex and brainstem
LMN: spinal cord

3
Q

UMN or LMN? terminate on lower moter neurons in the CNS

A

UMN

4
Q

UMN or LMN? innervate skeletal m.

A

LMN

5
Q

UMN or LMN? information from brain to spinal cord segment

A

UMN

6
Q

UMN or LMN? information from spinal cord segment or motor unit

A

LMN

7
Q

UMNs/LMNs function to initiate and direct voluntary activity of m. and maintain muscle tone for support and regulation of posture/balance

A

UMNs

8
Q

Axons of UMN cell bodies travel down the SC via either the _____ motor system or the _____ motor system

A

Dorsolateral or ventromedial

9
Q

LMN cell bodies are found in the dorsal/ventral horn of the SC

A

Ventral

10
Q

point-for-point correspondence of an area of the body to a specific point in the CNS

A

somatotopy

11
Q

What UMNs are located in the dorsolateral area of the SC?

A

distal m.: fine motor segments and flexors

12
Q

What UMNs are located in the ventromedial SC?

A

Proximal m.: whole limb movement

primarily extensors

13
Q

Which part of the SC houses m. used for posture and balance?

A

Ventromedial

14
Q

What happens if there is damage to the dorsolateral motor systems?

A

dec. or absent voluntary movements of the fine fotor systems

15
Q

What happens if there is damage to the ventromedial motor systems?

A

dec. or absent voluntary movements of the whole limb

16
Q

What happens if the afferent sensory pathways are damaged?

A

prevents sensory info from reaching the brain

dec. or absence of proprioception, nociception, and tactile sensation

17
Q

What is housed in the white matter of the SC?

A

axons

18
Q

What is housed in the grey matter of the SC?

A

cell bodies

19
Q

Which horn of the SC recieves afferent info and relays to interneruons

A

Dorsal horn

20
Q

what is in the intermediate zone of the SC

A

interneurons

21
Q

Which horn of the SC houses cell bodies of efferent motor neurons

A

ventral

22
Q

Where is the lateral horn of the SC?

A

only on thoracic and lumbar spines

23
Q

what is contained in the lateral horn of the sc?

A

cell bodies of presynaptic sympathetic neurons

24
Q

T/F. Transverse damage to the spine causes both UMN and LMN damage

A

t

25
Q

You will see UMN signs cranial/At/caudal to the spinal lesion

A

Caudal

26
Q

You will see LMN signs _cranial/at/caudal to the spinal lesion.

A

At

27
Q

What are the 4 LMN signs?

A
  1. paresis or paralysis
  2. Dec/ absent m. tone
  3. Dec/absent reflexes
  4. Rapid onset m. atrophy
28
Q

What are 4 UMN signs?

A
  1. Paresis or paralysis
  2. Normal to inc. m. tone/clonus
  3. Normal to inc. spinal reflexes
  4. slow m. atrophy
29
Q

somatic innervationof the bladder?

A

pudendal n.

urethralis m. voluntary control of micturition

30
Q

PSNS innervation of the bladder

A

pelvic n,

smooth m. contraction of bladder

31
Q

SNS innervation of the bladder

A

Hypogastric

inhibitor action of detrussor m.

32
Q

UMN Bladder signs

A

No voluntary micturition
severe bladder distension
inconsistent urine leakage
resistance to manual expression

33
Q

LMN bladder signs

A

Continuous leakage, dribbling
no tone to urethralis
evacuation of bladder is easy

34
Q

What is schiff-sherrington syndrome?

A

severe damage to T3-L3

inc. in thoracic limb extensor tone (rigid extension of limb)