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3 NERVOUS SYSTEM > Approach To UMN > Flashcards

Approach To UMN Flashcards

1
Q

UMN
Corticospinal ➕ Corticobulbar fibers ➕ Extra pyramidal fibers
🧠⚡he drove a hondaCRVTOdisneyland ⚡

A

Descending motor tracts (Corticospinal tract ➕ Extra pyramidal system) that merge on AHC or Cranial Nerve nuclei

⭐ Descending Tracts

Corticospinal tract (Lateral & Anterior)
Rubrospinal tract
Vestibulospinal tract
Tectospinal tract
Olivospinal tract

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2
Q

Descending Tracts in Lateral Column
🧠⚡ RL⚡
🧠⚡CR-v to ⚡

A

Rubrospinal Tract
Lateral Corticospinal tract

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3
Q

Descending Tracts in Anterior Column
🧠⚡ A VOTe⚡

A

Anterior Corticospinal tract
Vestibulospinal tract
Olivospinal tract
Tectospinal tract

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4
Q

All tracts in spinal cord is represented in ARRANGEMENT except

🧠⚡ ML ➡️ CTLS⚡

A

Cervical ➡️ Thoracic ➡️ Lumbar ➡️ Sacral

⭐ Dorsal Column
ML ➡️ SLTC
SACRAL ➡️ LUMBAR ➡️ THORACIC ➡️ CERVICAL

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5
Q

ViP makes you STAND UP

Sit on Rubber mat

A
  1. Vestibular spinal tract
  2. Pontine Reticulo-spinal tract

Sit down
1. Rubrospinal tract
2. Medullary Reticulo-spinal Tract

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6
Q

Vestibular Apparatus
Function

A

✨ For standing up
✨ Activates and Increases tone of ANTI-GRAVITY Muscles

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7
Q

Red Nucleus functions
Rubrospinal Tract

A

Increases tone of GRAVITY muscles
Flexors of Upper limb

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8
Q

Corticospinal Tract

A
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9
Q

Steps for Movement
Managed by?

A

Plan
Posture
Tone
Position of Proximal muscles
Inhibition of Opposite muscle

⭐ Integration of zskill: CST
⭐ Planning, Position and other things managed by EPS

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10
Q

Finesse to the movement is given by

A

Cerebellum

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11
Q

Corticospinal tract: Cortex

A

60% FIBERS FROM: FRONTAL LOBE

30% fibers: Originate from 1deg MOTOR CORTEX

30% FIBERS: Originate from PREMOTOR CORTEX (Area 6,8) and Supplementary Motor Cortex

40% fibers: Originate from Area 3,1,2 (SENSORY CORTEX): PARIETAL LOBE

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12
Q

Cell of BETZ

A

Giant pyramidal neurons WITH LARGE MYELINATED AXONS in Lamina 5 in MOTOR CORTEX
⬇️
LOWEST THRESHOLD FOR EXCITABILITY

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13
Q

Extra pyramidal fibers
Originate from

A

Pre-motor Cortex and Supplementary Motor Cortex

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14
Q

Corticobulbar fibers to the cranial nerve nuclei in the BRAINSTEM have B/L representation in the CORTEX
EXCEPT

A

7th CN: Facial Nerve

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15
Q

⭐ Cell of BETZ end on:

⭐ Other Corticospinal fibers end on:

A

⭐ Cell of BETZ end on: DIRECTLY ON ALPHA MOTOR NEURON

⭐ Other Corticospinal fibers end on: INTERNEURONS

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16
Q

UMN Lesion of 7th Cranial Nerve

LMN lesion of 7th CRANIAL NERVE

A

⭐ LOWER HALF of the FACE is affected while UPPER PART IS SPARED
➕
ANGLE OF MOUTH DEVIATED TO OPPOSITE SIDE

⭐ LMN lesion of 7th CRANIAL NERVE:
One HALF of the FACE AFFECTED

17
Q

CORTICOBULBAR INVOLVEMENT ON ONE SIDE, CLINICAL FEATURES

A

No manifestation
Except: FACIAL NERVE

18
Q

CORONA RADIATA: Packaging

Internal Capsule: Packaging

A

LOOSE PACKAGING: Fibers of CST descend

⭐ DENSE PACKAGING: IN INTERNAL CAPDULE

19
Q

White MATTER in Cerebrum
Parts
🧠⚡ACP ⚡

A

⭐ Association Fibers
⭐ Commissural Fibers
⭐ Projection Fibers

20
Q

Example of PROJECTION FIBER
Connects Cortical structure with Subcortical structures

A

Internal Capsule
Parts:
1. Ant Limb
2. Genu
3. Posterior Limb

21
Q

Relations of INTERNAL CAPSULE

A
22
Q

Fibers passing through INTERNAL CAPSULE
🧠⚡ROP ⚡
🧠⚡ SAU PPT⚡

A
23
Q

If Corticospinal lesion at LEVEL OF INTERNAL CAPSULE, KNOWN AS
🧠⚡3H ⚡

A

DENSE HEMIPLEGIA
⭐ dense HEMIPLEGIA
⭐ Hemi-sensory loss
⭐ Homonymous Hemianopia

24
Q

Main BLOOD SUPPLY of INTERNAL CAPSULE

A

Middle CEREBRAL ARTERY

Others:
Anterior Cerebral Artery
Anterior Choroidal Artery

25
Q

Blood supply of INTERNAL CAPSULE
🧠⚡UPPER PART OF Each part is supplied by SAME ARTERY: LENTICULOSTRIATE BRANCH OF MIDDLE CEREBRAL ARTERY ⚡

A
26
Q

⭐ Medial Striate Artery is a BRANCH OF

⭐ Lateral Striate Artery is a BRANCH OF

⭐ Posterior Striate Artery is a BRANCH OF

A

⭐ Medial Striate Artery is a BRANCH OF
ACA

⭐ Lateral Striate Artery is a BRANCH OF
MCA

⭐ Posterior Striate Artery is a BRANCH OF
PCA

27
Q

CHARCOT BOUCHARD ANEURYSM

A

Aneurysm seen in STRIATE BRANCH OF MIDDLE CEREBRAL ARTERY

28
Q

Artery of CHARCOT Hemorrhage

A

Lateral Striate Artery

29
Q

Huebner’s Artery

A

Recurrent branch of ANTERIOR CEREBRAL Artery

30
Q

CST in Midbrain

A
31
Q

UMN Lesion in MIDBRAIN
Known as?

A

⭐ CROSSED HEMIPLEGIA (OR) ALTERNATING HEMIPLEGIA
⬇️
I/L LMN CN palsy
➕
C/L UMN LESION (Weakness)

32
Q

CST in PONS

A

Present as DISJOINED FASICLES at BASILAR PART OF PONS

⚡ Why?
⭐ Fibers of Nuclei Pontis
⭐ Crossing fibers of MIDDLE CEREBRAL PEDUNCLES

33
Q

Medulla Oblongata

A
34
Q

Termination of Corticospinal Tract

A
35
Q

⭐ % of Fibers of CST that end at CERVICAL REGION

⭐ % of Fibers of CST that end at THORACIC REGION

⭐ % of Fibers of CST that end at LUMBAR REGION

A

⭐ % of Fibers of CST that end at CERVICAL REGION
⚡⚡55%

⭐ % of Fibers of CST that end at THORACIC REGION
⚡⚡20%

⭐ % of Fibers of CST that end at LUMBAR REGION
⚡⚡25%

36
Q

HEMIPLEGIA
Possible CAUSES

A

⭐ OPPOSITE CORTEX (CORTICAL)
🎯 MCA
🎯 ACA

⭐ OPPOSITE Subcortex

⭐ OPPOSITE Brainstem

3 NERVOUS SYSTEM (40 decks)

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