Final Exam: UMN/LMN

Question 1

UMN and LMN are afferent or efferent

Answer 1

efferent (descending)

Question 2

UMN or LMN? cell bodies in CNS

Answer 2

Both
UMN: cortex and brainstem
LMN: spinal cord

Question 3

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

Answer 3

UMN

Question 4

UMN or LMN? innervate skeletal m.

Answer 4

LMN

Question 5

UMN or LMN? information from brain to spinal cord segment

Answer 5

UMN

Question 6

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

Answer 6

LMN

Question 7

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

Answer 7

UMNs

Question 8

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

Answer 8

Dorsolateral or ventromedial

Question 9

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

Answer 9

Ventral

Question 10

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

Answer 10

somatotopy

Question 11

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

Answer 11

distal m.: fine motor segments and flexors

Question 12

What UMNs are located in the ventromedial SC?

Answer 12

Proximal m.: whole limb movement

primarily extensors

Question 13

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

Answer 13

Ventromedial

Question 14

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

Answer 14

dec. or absent voluntary movements of the fine fotor systems

Question 15

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

Answer 15

dec. or absent voluntary movements of the whole limb

Question 16

What happens if the afferent sensory pathways are damaged?

Answer 16

prevents sensory info from reaching the brain

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

Question 17

What is housed in the white matter of the SC?

Answer 17

axons

Question 18

What is housed in the grey matter of the SC?

Answer 18

cell bodies

Question 19

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

Answer 19

Dorsal horn

Question 20

what is in the intermediate zone of the SC

Answer 20

interneurons

Question 21

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

Answer 21

ventral

Question 22

Where is the lateral horn of the SC?

Answer 22

only on thoracic and lumbar spines

Question 23

what is contained in the lateral horn of the sc?

Answer 23

cell bodies of presynaptic sympathetic neurons

Question 24

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

Answer 24

t

Question 25

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

Answer 25

Caudal

Question 26

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

Answer 26

At

Question 27

What are the 4 LMN signs?

Answer 27

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

Question 28

What are 4 UMN signs?

Answer 28

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

Question 29

somatic innervationof the bladder?

Answer 29

pudendal n.

urethralis m. voluntary control of micturition

Question 30

PSNS innervation of the bladder

Answer 30

pelvic n,

smooth m. contraction of bladder

Question 31

SNS innervation of the bladder

Answer 31

Hypogastric

inhibitor action of detrussor m.

Question 32

UMN Bladder signs

Answer 32

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

Question 33

LMN bladder signs

Answer 33

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

Question 34

What is schiff-sherrington syndrome?

Answer 34

severe damage to T3-L3

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