Descneding tracts Flashcards

1
Q

بسم الله الرحمن الرحيم وبه نستعين
UMN IS ?

A

Nerves from cortex and subcortical Nuclei to the AHCs of spinal cord or Cranial Motor Nuclei

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2
Q

LMN IS ?

A

AHCs a motor neurons of spinal cord and Cranial motor Nuclei and their Axons

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3
Q

Some characteristic of UMNs pYRAMIDAL TRACT

A

From cortex
To a motor neurons of AHCs + Cranial Nerve Nuceli
60% Develops after 1 year
3%From betz cells of area 4
It is Well developed

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4
Q

Functions of Pyramidal Tracts

A

-Movements:-
Gross + Fine movements
Gross for positioning and fixation
postural background for fine movments.
To perform Fine skilled Movements in distal limb muscles
Faciltatory to Superfical and deep reflexes
______________________
-Reflexes:-
Inhibits Babinski reflex
_______________________
-According to areas :-
-Area 4 fine
-Area 6 and supplemental gross
-Area 8 contral lateral volunary lateral conjugate eye movements

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5
Q

Extrapyramidal tracts in brief

A

From cortex motor mainly area 6
to basal ganglia which Is Distrubitive Center to the Nuceli of Extra pyarmidal tracts :
Red Nucleus = Rubrospinal
Tectum of mid brain = Tectospinal
Vestibular nucleus= Vestibulopsina;
Retiuclar formation = Reticulospinal
Inferior olivary nucleus = Olivospina

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6
Q

Lateral brainstem pathway in Extrapyramidals ?

A

Rubrospinal tract for fine movements

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7
Q

Medial brains stem pathaway for extrapyramidals ?

A

Tectospinal
Vestibulospinal
Reticulospina;l

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8
Q

other area that has a map for motor movemnts than area 4 ?

A

Red nucleus im mid brain

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9
Q

Termination and control of medial brainstem extrapyramidals ?

A

Ends on medial AHCs alpha motor neurons for ?
Axial and proximal limb muscles for gross movments and postural background for fine movements

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10
Q

Termination and controol of lateral brainsterm extrapyramidals ?

A

Ends on lateral AHCs alpha notor neurion for ?
Distal limb Muscles for Fine movements
It faciltate flexor parts of AHCs and inhivits externsors

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11
Q

How to compare between medial and lateral brainstem extrapyrmaidals ?

A

in Tracts + Termination + Control(function)

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12
Q

Mnetion functions of Extrapyramidal tracts

A

Coorfination of Voluntary movements gross and fine:
Gross movemnts for fixation and posistioningg and postural background for
Fine movements alternative pathway in rubrospinal alternative to Lateral coritcospinal in lesion
_________________________
Facilitatory and inhibtory to SR
Functional regulation of Automnomic function in CVS resp
_________________________
Tectospinal : Medial Aduial reflex
Larteal : visual reflex eye protective reflexes
Vestibulospinal Activating Alpha motor neurons for antigravity extensors muscles

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13
Q

How to compare between pyrmaidal and ExtraPyramidal Tracrts

A

Origin
tract

Crossing
Termination
Start of function
funciton

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14
Q

Compare between Pyramidal and Extrapyramidal tracts

A

Pyramidal : from cortex - One neuron from cortex to Anterior HOrn cells of spinal cord of Cranial motor nuclei one synapse -90 % crossing -start function after year - function for fine movements and gross and for ++SR
___________________
ExtraPyramidal : cortical subcortical - Polysynaptic as go to basal ganglia then ditrbted - terminates in AHCs of spinal cord only - start during first year - Function gross movments + alternative fine movements may be
++ or– for SR

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15
Q

How to compare between descneding Tracts ?

A

TRACTS
Termination
COntrol
Lesion

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16
Q

Compare between descending Tracts

A

Lateral descneding :
Rubrsospinal-Lateral Corticospinal
Terminates in the lateral motor neurons of the AHCs in 1 or 2 segments for precise movements as it is responsible for distal limb muscles fine movements and its lesion causes loss of Fine movements in fingers and wrist with preservations of gross moveents
lesion to LCS only casues loss of finger fraction finve movments with perservation of wrist function by rubrospinal tract
__________________________
Medial descending :Ventral CS
Retuclospinal–Tectospinal-Vestibulospinal
Terminates in medial AHCs of the Spinal cord in multiple segments intersegmental for Control of movments of group of muscles
for axial and proximal limb muscles gross movements for Stabilization and Fixation and Postural Backgroung for fine movments and its lesion causeS ?
Loss of Gross movements posttural backgoround gfor fine movemetns
dfffiuvlt in sitting standing walking

17
Q

Medial descending tracts desvribe

A

Medial descending :Ventral CS
Retuclospinal–Tectospinal-Vestibulospinal
Terminates in medial AHCs of the Spinal cord in multiple segments intersegmental for Control of movments of group of muscles
for axial and proximal limb muscles gross movements for Stabilization and Fixation and Postural Backgroung for fine movments and its lesion causeS ?
Loss of Gross movements posttural backgoround gfor fine movemetns
dfffiuvlt in sitting standing walking

18
Q

Lateral descneding tracts :
desvribe

A

Lateral descneding :
Rubrsospinal-Lateral Corticospinal
Terminates in the lateral motor neurons of the AHCs in 1 or 2 segments for precise movements as it is responsible for distal limb muscles fine movements and its lesion causes loss of Fine movements in fingers and wrist with preservations of gross moveents
lesion to LCS only casues loss of finger fraction finve movments with perservation of wrist function by rubrospinal tract

19
Q

عسي ربي أن يهديني سواء السبيل

A