A-CNS Anatomy > Pyramidal Tract > Flashcards

Pyramidal Tract Flashcards

(61 cards)

Study These Flashcards
1
Q

بسم الله الرحمن الرحيم وبه نستعين
“ ولا خوف عليهم ولاهم يحزنون “

Define Descnding Pathways

A

They are Motor pathway deliver motor repsones or instruction from cerberalcortex to spinal cord
Divded into :
Pyramidal : Direct from corticospinal + corticobulbar
ExtraPyrmidal Indirect path

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Descnednig pathways are subdivided into ?

A

Pyramidal direct pathway
Extrapyramidal indirect pathway

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Pyramidal = ?

A

Coticospinal + CorticoBulbar Tracts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Corticospinal tract contain ?

A

Lateral + Anterior Corticospinal Tract

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

as we know sensory path have 3 neurons /

A

first ordere DRG
Seond order differs
3rd order from thalamus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Motor pathways involve ,……Neuronos and name them .

A

2 Neurons
Upper Motor Neuron
Lower Motor Neuron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Origin of Pyramidal Tracts
Cotricospinal tract

A

Motor area 4 + Premotor Cortex area6
Motor area 4 gives the pyramidal Neurons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

UMN of pyramidal tracts are ?
their axons form ?

A

Pyramidal Neurons of area4 are UMN of Pyramidal Tract
Their Axons Form? the corticospinal Tract

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Lateral Corticospinal Tract lies …….. to Dorsal or posterior spinocerbellar Tract ?

A

Medially
شوفت الاحوال بتتغير؟ !

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Anterior coricospinal tract lies Medially to ,,,,,,,,,+,,,,,,,,,?

A

Reticulospinal + Tectospinal Tract

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Transvers pontine fibers give definition ?

A

Fibers arising form Pontine Neucli Present in the Pons separating bundles of fibers of pyramidal tract

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

LMN ? Define

A

The Anterior horn Motor neurons exist spinal cord as anterior root .

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Course in brain of pyramidal tract

A

starts from precetnral gyrus primary motor area 4 + premotor cortex 6 .
Axons of neurons in the cerberal cortex converge in Corona radiata and occupies the anterior 2/3 of posterior limb of Internal Capsule between Thalamus and basal ganglia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Posterior limb of internal capsule is located between ?

A

Thalamus and basal ganglia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Course of Pyramidal Tract in Midbrain explain ?

A

The middle 3/5 of crus cerberi which is the anterior part of cerberal peducle of Midbrain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Course of Pyramidal Tract in Pons explain

A

Pass through most anteiror part of pons called Basis Pontis Scattering as Bundles Separated By Transvers pontine Fibers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Where do the fibers form the pyramid ?

A

The pyramid is formed at convegence in cerebral cortex+
The fibers form Pyramid In the

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Where do the fibers form the pyramid ?

A

The pyramid is formed at convegence in cerebral cortex+
The fibers Collect to form Pyramid In the medulla
عندك هرمين خوفو وخفرع

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Where does pyramidal decussation occur ?

A

It occurs at the most lower part of medulla also called
Motor decussation by 80% of fibers of pyramid to desdcends to Laterallll Coritcopsinal tract
The Remeaning 20% continues in the same side without decussation to Anterior Coricospinal Tract will decussate in spinal cordDD

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

describe in brief the path of pyramidal tract to The spinal cord

A

In cortec : axons collects as Pyramid from area 4+6
then corona radiate then pos limb of internal capsule
In Midbrain : Crus Cerebri
In Pons : Basis Pontis
In medulla : pyramid :
a- 80% motor ducssation + lateral coricospinal tract
b-20% uncrossed +anterior Corticospinal tract to Deucssate in spinal cord to reach AHCs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Antreior horn is divided into ?”

A

Lateal +Medial+central Groups

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Muscles of limbs are supplied by which group of Anterior Horn ?

A

The Lateral Group for Limb Muscles
From Cervical + Lumbar Enlargments
Represent termination of Lateral Corticospinal tract

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

From cervcial and Lumbar enlargmetns appear ?

A

The lateral group of AHCs
form Muscles of Limbs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Medial Group of Anterior horn explain

A

For Trunk Muscles
From all Segments !

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
All segments of spinal cord gives.... in anterior horn ?
Medial group for Tunk Muscles
25
Central group of Anterior horn cells explain
From Cervical Segments only! C3-C5 for Phrenic Nerve C5 OR C6 cervical segmetns give acessoy nuclesu for spinal acessory nerve ?
26
Central group of Anterior horn cells explain
From Cervical Segments only! C3-C5 for Phrenic Nerve C5 OR C6 cervical segmetns give acessoy nuclesu for spinal acessory nerve ?
27
C3-C5 segmetns give
C3-C5 for Phrenic Nerve
28
C5 OR C6 cervical segmetns give
C5 OR C6 cervical segmetns give acessoy nuclesu for spinal acessory nerve ?
29
Represent termination of Lateral Corticospinal tract
Lateral group of Anterior Horn supply the limb muscles
30
uncrossed 20% fibers terminate as
anterio corticospinal tract in Medial group of Anterior Horn supplying trunk
31
Only 2% of pyramidal tract fibers terminate at?
Spinal accessory necuels for Spinal Acessory Nerve for ? SternoMastoid
32
Second Or alternative termination of Pyramidal tract fibers ?
Some pyramidal tract fibers or corticospinal fibers terminate at Cranial nerves Nuclei in brainstem Forming Cortico Nuclear or CorticoBulbar Tract
33
CorticoNuclear Or Cotricobulbar tract
Formed when fibers of pyrmaidal tract terminate in the Cranial Nerve Nuclei at brainstem It supplies Muscles of Head
34
CorticoNuclear Or Cotricobulbar tract path
from corona radiate to !!! The Genu !! of internal capsule to the Cranaul nerve Nuclei ... in opposite to corticospinals that pass through post limb of internal capsule
35
Cortiobulbar or CotricoNuclear supplies .....+...... ?
Contralateral+Ipsilateral Cranial Nerve Nuclei
36
Are all cranial nerve ncueli receving bilateral fibers from Corticobulbar and CorticoNuclear?
no Moslty they receive contra +ipsi but there are 2 Nucelis Receving only Contra which are: Lower half of ? Facial for lower facial Muscles Hypolglossal For Genioglossus COntttttttra Only
37
Are all cranial nerve ncueli receving bilateral fibers from Corticobulbar and CorticoNuclear?
no Moslty they receive contra +ipsi but there are 2 Nucelis Receving only Contra which are: Lower half of ? u Facial for lower facial Muscles Hypolglossal For Genioglossus COntttttttra Only
38
upper half of facial nucleus is ?
Bilateral Conta+ipsi while the lower half only contra
39
Upper motor Neuron of Pyramidal tract is ?
The fibers of pyramidla tract descending from cortex to reach : A-spinal cord AHCs B-Cranial Nerve Nuclei
40
Lower motor Neuron of Pyramidal tract is ?
A- FIBERS Of AHCs of Spinal cord which give ventral root to Muscles B-fibers from Cranial Nerve Nuclei That Reach Muscles of FACE
41
in Brain sterm Nuclei recieve Coricobulbar tract?
1-GSE 3,4,6,12 general somatic efferent Nuclei 2-SVE 7.9.10.11 Sepcial visceal Efferent Nuclei
42
gse NUCLEI
general somatic Efferent Nuclei3,4,6,12 For extraocular Muscles +Tongue ExtraOcular Muscle : Occlumotor 3 Trochlear4 Abudcent6 Tongue : Hypoglossal12
43
SVE nuckei
special visceral efferent Efferent nuclei : 5,7,9,10,11 Trigeminal First pharyngeal arch muscels of Mastication . Facial for facial expressive muscles 2nd pharyngeal arch Ambigus Nucleus : 9,10,11 Glossophayngeal:3rd pharyngeal arch stylopharyngeus Vagus:4th 6th arch palate larynx pharunx muscle Acessory:4th 6th arch palate larynx pharunx muscle
44
Trigeminal Nucelus supply ?
First pharyngeal arch muscels of Mastication
45
Facial Nucleus supplies?
Facial for facial expressive muscles 2nd pharyngeal arch
46
Ambigus Nucleus :supplies ?
9,10,11 Glossophayngeal:3rd pharyngeal arch stylopharyngeus Vagus:4th 6th arch palate larynx pharunx muscle Acessory:4th 6th arch palate larynx pharunx muscle
47
Glossophayngeal:
3rd pharyngeal arch stylopharyngeus
48
Vagus: Acessory:
4th 6th arch palate larynx pharunx muscle
49
CorticoBulbar not involve ?
Special sense 1,2,8 Nuecli
50
Face is in ...... area of motor cortex ?
Lower as body represnation is upside down or inverted
51
Foor is in ...area of Motor cortex?
Medial surface of cerebral hemisphere as body represnation is upside down or inverted
52
In the internal capsule what happen for both tract mentioned above ? corticospinal Corticobulbart
Corticospinal post limb of internal capsule as anterior upper limb + loer limb motor CorticoBulbar genu of Internal Capsule as in Face muscles
53
Lamination in crus cerebri ?
From medial to lateral Cervical Thoracic Lumbar Sacral also laminatyion in spinal cord do so
54
Cortiocspinal tract need ...For baby to walk in ..year ?
Myelination Second
55
If UMN in pyramidal Tract cut leads to ?
Loss of its supressive effect on AHCs HyperReflexia HyperTonia may leasds to atrophy due to no use of muscles Spasticparalysis +Babeniski
56
If LMN of Pyramidal Tract Cut This leads to ?
No respone from muscle due to cut of its communcation with CNS Loss of tone loss of reflex Flaccid paralysis soft paralysis -Babenski
57
Babinski sign occurs in Cut UMN explain ?
On mechnical stimulatio nof outer edge of sole of foot leads to DorsiFlexion of Big toe and Fanning of others While in fact in healthy should be plantar flexed This is called Extensor Respone
58
Babinski sign is positive+ in ?
الأطفال أقل من سنتين عشان مفيش-1 ميلين علي الياف الكورتيكو سبيتال طبعا تلف العصب الحركي العلوي- وفي الغيبوبة العميقة-
59
الحمدلله رب السموات رب الارض رب العالمين
59
الحمدلله رب السموات رب الارض رب العالمين
A-CNS Anatomy
flashcards
Decks in class (27)
# Cards
Brainscape helps you reach your goals faster, through stronger study habits.
© 2026 Bold Learning Solutions. Terms and Conditions