˛
NUR 265 Complex Mobility, Sensation & Cognition
Practice Questions 2026 | Graded A+
UNIT 7: Complex Mobility, Sensation & Cognition
˛C* Decerebrate vs Decorticate Posturing (UMNL)
Ç Definition:
Posturing is an abnormal motor response indicating severe brain injury, often due to an upper
motor neuron lesion (UMNL) or increased intracranial pressure (ICP).
Q Types of Posturing:
•
˙
Feature Decorticate Posture Decerebrate Posture
. Definition
•
9
„
˙ Flexion posturing Extension posturing
C Brain Damage
*
˛ Above the brainstem (cortex, At or below the brainstem
Location internal capsule) (midbrain, pons)
Arms flexed, adducted, Arms extended, adducted,
+ Arm Position
¹
t
›
ı
r
J
wrists/fingers flexed pronated
Leg Position Legs extended, plantar flexed Legs extended, plantar flexed
▲ Severity
_
`
´
'
· Less severe (better prognosis) More severe (worse prognosis)
Can deteriorate into decerebrate
⬛ Can Progress To posturing
’ Can lead to brain death
/
¡
¶
#
ç
Associated Conditions:
• Decorticate Posture:
o Stroke (cerebral cortex)
o Hemispheric trauma
o Tumors above the midbrain
o ICP with thalamic involvement
• Decerebrate Posture:
o Brainstem injury (midbrain/pons)
o Severe trauma or herniation
o Hypoxia/anoxia
o Increased ICP with brainstem pressure
o Hepatic encephalopathy or metabolic coma
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,*
C
˛
UMNL (Upper Motor Neuron Lesion) Hallmarks:
• Hyperreflexia
• Spasticity
• Positive Babinski
• Decreased motor control (especially voluntary movement)
• Muscle weakness without atrophy
• Associated with both postures
µ
,u
ˆ
‘˜^
.˙
¡†
T
^.
-̇
*
r Nursing Priorities:
1. Assess & Monitor:
o GCS changes and LOC
o Pupil reactivity
o Motor changes (new posturing, progression)
o Vital signs (Cushing’s triad: ↑BP, ↓HR, ↓RR)
2. Prevent Further Injury:
o Maintain airway and oxygenation
o Elevate HOB 30° (unless contraindicated)
o Control ICP (mannitol, hypertonic saline)
o Seizure precautions
o Protect from contractures (splinting, ROM)
3. Notify Provider Immediately If:
o Posturing develops or worsens
o Signs of herniation (fixed pupils, posturing, coma)
˛
C
*
NCLEX Tip:
If a question describes flexed arms on the chest with stiff legs → Think Decorticate (think
“Core” = arms pulled toward core).
If it describes rigid extension and arms by the side, head arched back → Think Decerebrate (“E”
for extension = worse).
ı
.
Red Flags:
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, • Sudden posturing = possible brain herniation
• Decerebrate posture is more ominous
• Combined decorticate and decerebrate responses = widespread injury
1. Increased Intracranial Pressure (ICP)
Pathophysiology:
• Caused by ↑ in brain volume (tumor, edema), blood (hemorrhage), or CSF
(hydrocephalus)
• Normal ICP: 5–15 mmHg; >20 mmHg is critical
• ↓ Cerebral perfusion pressure (CPP = MAP − ICP) → ischemia
HIGHER ICP = LOWER PERFUSION (THE BRAIN HAS MINIMAL ROOM TO EXPAND)
If too high the brain herniates down through the hole at the bottom of skull and leads to brain
stem dysfunction
Early Signs:
• LOC change (earliest indicator!)
• GCS changes by 2 points
• Headache
• Nausea, vomiting (projectile)
• Pupillary changes (sluggish or unequal), blown = herniation
• Weakness in one extremity
• Worsening headache
• CN dysfunction
Late signs:
• Stuporous, reacting to painful stimuli
• Comatose
• Decorticate/decerebrate posturing or flaccidity
• GCS <8
• Cushing’s Triad: ↑ SBP + widened pulse pressure, bradycardia, irregular respirations
o Fixed/dilated pupils, loss of brainstem reflexes
o Cheye-stokes and ataxic breathing
Diagnostics:
• CT scan (fastest, safest)
• MRI, ICP monitoring (via ventriculostomy)
Nursing Priorities (NCLEX Tips):
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NUR 265 Complex Mobility, Sensation & Cognition
Practice Questions 2026 | Graded A+
UNIT 7: Complex Mobility, Sensation & Cognition
˛C* Decerebrate vs Decorticate Posturing (UMNL)
Ç Definition:
Posturing is an abnormal motor response indicating severe brain injury, often due to an upper
motor neuron lesion (UMNL) or increased intracranial pressure (ICP).
Q Types of Posturing:
•
˙
Feature Decorticate Posture Decerebrate Posture
. Definition
•
9
„
˙ Flexion posturing Extension posturing
C Brain Damage
*
˛ Above the brainstem (cortex, At or below the brainstem
Location internal capsule) (midbrain, pons)
Arms flexed, adducted, Arms extended, adducted,
+ Arm Position
¹
t
›
ı
r
J
wrists/fingers flexed pronated
Leg Position Legs extended, plantar flexed Legs extended, plantar flexed
▲ Severity
_
`
´
'
· Less severe (better prognosis) More severe (worse prognosis)
Can deteriorate into decerebrate
⬛ Can Progress To posturing
’ Can lead to brain death
/
¡
¶
#
ç
Associated Conditions:
• Decorticate Posture:
o Stroke (cerebral cortex)
o Hemispheric trauma
o Tumors above the midbrain
o ICP with thalamic involvement
• Decerebrate Posture:
o Brainstem injury (midbrain/pons)
o Severe trauma or herniation
o Hypoxia/anoxia
o Increased ICP with brainstem pressure
o Hepatic encephalopathy or metabolic coma
messages.downloaded_by
,*
C
˛
UMNL (Upper Motor Neuron Lesion) Hallmarks:
• Hyperreflexia
• Spasticity
• Positive Babinski
• Decreased motor control (especially voluntary movement)
• Muscle weakness without atrophy
• Associated with both postures
µ
,u
ˆ
‘˜^
.˙
¡†
T
^.
-̇
*
r Nursing Priorities:
1. Assess & Monitor:
o GCS changes and LOC
o Pupil reactivity
o Motor changes (new posturing, progression)
o Vital signs (Cushing’s triad: ↑BP, ↓HR, ↓RR)
2. Prevent Further Injury:
o Maintain airway and oxygenation
o Elevate HOB 30° (unless contraindicated)
o Control ICP (mannitol, hypertonic saline)
o Seizure precautions
o Protect from contractures (splinting, ROM)
3. Notify Provider Immediately If:
o Posturing develops or worsens
o Signs of herniation (fixed pupils, posturing, coma)
˛
C
*
NCLEX Tip:
If a question describes flexed arms on the chest with stiff legs → Think Decorticate (think
“Core” = arms pulled toward core).
If it describes rigid extension and arms by the side, head arched back → Think Decerebrate (“E”
for extension = worse).
ı
.
Red Flags:
messages.downloaded_by
, • Sudden posturing = possible brain herniation
• Decerebrate posture is more ominous
• Combined decorticate and decerebrate responses = widespread injury
1. Increased Intracranial Pressure (ICP)
Pathophysiology:
• Caused by ↑ in brain volume (tumor, edema), blood (hemorrhage), or CSF
(hydrocephalus)
• Normal ICP: 5–15 mmHg; >20 mmHg is critical
• ↓ Cerebral perfusion pressure (CPP = MAP − ICP) → ischemia
HIGHER ICP = LOWER PERFUSION (THE BRAIN HAS MINIMAL ROOM TO EXPAND)
If too high the brain herniates down through the hole at the bottom of skull and leads to brain
stem dysfunction
Early Signs:
• LOC change (earliest indicator!)
• GCS changes by 2 points
• Headache
• Nausea, vomiting (projectile)
• Pupillary changes (sluggish or unequal), blown = herniation
• Weakness in one extremity
• Worsening headache
• CN dysfunction
Late signs:
• Stuporous, reacting to painful stimuli
• Comatose
• Decorticate/decerebrate posturing or flaccidity
• GCS <8
• Cushing’s Triad: ↑ SBP + widened pulse pressure, bradycardia, irregular respirations
o Fixed/dilated pupils, loss of brainstem reflexes
o Cheye-stokes and ataxic breathing
Diagnostics:
• CT scan (fastest, safest)
• MRI, ICP monitoring (via ventriculostomy)
Nursing Priorities (NCLEX Tips):
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