مقدمة الجهاز العصبي الحركي

Question 1

بسم الله الرحمن الرحيم وبه نستعين
“سنريهم آياتنا في الآفاق وفي أنفسهم حتي يتبين لهم أنه الحق “
Define Motor Nervous System

Answer 1

System responsible for
Intiation + Coordination +Control of Skeletal Muscle Contraction

Question 1

بسم الله الرحمن الرحيم وبه نستعين
“سنريهم آياتنا في الآفاق وفي أنفسهم حتي يتبين لهم أنه الحق “
Define Motor Nervous System

Answer 1

System responsible for
Intiation + Coordination +Control of Skeletal Muscle Contraction

Question 2

Motor of Facial Muscles is controlled by?

Answer 2

Nuclei of Motor Cranial Nerves

Question 3

Motor of body muscles is controlled by ?

Answer 3

AHCs of Spinal Cord

Question 4

If UMN is cut leads to ?

Answer 4

Voluntary contarction loss
Reflex is intact but is not as usual

Question 5

IF LMN IS CUT ?

Answer 5

Loss of Both voluntary and Reflex Movments

Question 6

Type of skeletal muscle contration ?

Answer 6

Voluntary purpoful
Reflex automatic

Question 7

Mention example of voluntary mocments

Answer 7

Fine Movements :
Fingers + hands called
distal limb muscles
Gross Movements :
Axial muscles: back
Proximal limb muscles: Arm

Learned Skilled Movments = Fine+Gross movements as piano playing

Question 8

Requirements of Voluntary muscle contraction mention

Answer 8

Intact Mucles
Intact UMN
Intact LMN

Question 9

Reflex Muscles contraction requiremts?

Answer 9

Intact muscle
intact Reflex Pathway
Intact LMN

Question 10

Reflex contracion as ?

Answer 10

Muscle ToOone

Question 11

Antreior horn cells has 2 types of neuron mention

Answer 11

Anterior motor neuron to SM
Interneurons Intermediate

Question 11

Antreior horn cells has 2 types of neuron mention

Answer 11

Anterior motor neuron to SM
Interneurons Intermediate

Question 12

types of anterior motor neurons

Answer 12

alpha +gama

Question 13

alpha motor neuron called ?

Answer 13

Lower motor neuron
Final common path
to odrinary contractile extrafusal muscle fibers

Question 14

Why alpha motor neuron called final common path ?

Answer 14

that is because whether the muscles contracted Voulnatry or Reflexly it needs in the end to send impusle to lower motor neuroooon

Question 15

somatotopic organiztation of a motor neurons

Answer 15

يعني خريطة توزيع الالفات

Question 15

medial part of Anterior horn supply ?

Answer 15

-Axial +Proximal limb muscles
-Gross Movements + Posture

Question 16

Dorsolateral part of Anterior horn supply?

Answer 16

Distal limb muscle
For fine movments

Question 17

Dorsal part of anterior horn for ?

Answer 17

Flexors

Question 18

ventral part on anterior horn for ?

Answer 18

Extensors

Question 19

In plexus area in spinal cord
Cervical + Lumbosacral enlargments there is ?

Answer 19

Numerous alpha motro neurons

Question 20

Below………………… alpha motor neurons control axial Muscles only

Answer 20

Below T1

Question 21

Functional unit used by motor system to perform movments? give defintion ?

Answer 21

Motor Unit
It is the alpha motor neuron+ its axons + Muscle fibers supplied

Question 22

Mortor unit for muscles of fine movments supply

Answer 22

3-6 fibers Low Inervation ration

Question 23

Motor unit for muscles of gross movments suupply

Answer 23

200-300 fibers High innervation ration

Question 24

Defina Motor Neuron Pool

Answer 24

كل اعصاب الفا الي بتغذي عضلة واحدة عصبيا all aplha motor neurons innervating Single muscle

Question 25

Motor neuron pool depends on one segment of spinal cord? ????

Answer 25

No! May extedns in several segments in spinal cord as Quadriceps from L2+L4 segments

Question 26

List the Factors affecting Discharge or rate of alpha motor Neurons .

Answer 26

1-Projections from higher centers 2-Interneurons 3-Endings of Sensory neurons in dorsal horn

Question 27

any contraction of muscle occures through activation of ?

Answer 27

alpha motor neurons

Question 28

Function of Gamma motor neurons

Answer 28

-Specialized for Contractile Intrafusal Fibers in Muscles spindle -They are smaller and fewer Axons called AY 4micro diameter

Question 29

mention types of gamma neurons

Answer 29

Large dynamic efferent y neuron Small static efferent y neuron

Question 30

Compare between a and y neruons in percentage

Answer 30

a 65 y 35

Question 31

Compare between a and y neruons in size

Answer 31

a larger

Question 32

Compare between a and y neruons in size

Answer 32

a larger neurons y smaller

Question 33

Compare between a and y neruons in fucntions

Answer 33

a: Ordinary contractile extrafusal muscle fibers y: specialized contractile intrafusal muscle fibers in msucle spindle

Question 34

Compare between a and y neruons in size in anterior horn

Answer 34

A: Take the larger size y ; take smaller size

Question 35

Compare between a and y neruons in types

Answer 35

alpha: one type Y 2 : Large dynamic+ Small Static

Question 36

اكتب نبذة عن خصائض الاعصاب الوسطية

Answer 36

منتشرة في كل مناطق المادة الرمادية للحبل الشوكي وحجمها صغير عشان كده الاستثارة بتاعتها بتكون سهلة لدرجة انها ممكن تطلق نبض بدون تحفيز اصلا عددها 30 مرة اكتر من الاعصاب الحركية كلها علي بعضها الفا وجاما زي اعصاب رينشو الوسطية التثبيطية

Question 37

Mechanism of actin of Inhibitory renshaw Neurons .

Answer 37

Activated by ach from Activated a motor neuron then Cause? 1-Reuccrent inhibition or Negative Feed back Inhibition to the a motor neurons that activated it by glycine 2-Lateral Inhibition to naerby unactivated a motor neurons by glycine

Question 38

site of Renshaw ?

Answer 38

Ventral Horn of Spinal cord

Question 39

What is the function of Renshaw ?

Answer 39

Lateral inhibition : Sharpening of Actions of muscles Recurrent Inhibtion: Prevents Overexcitation of Muscles and limit discharge of Alpha motor neuron

Question 40

معني رد الفعل ؟

Answer 40

ربط بين الجهاز العصبي الحسي والحركي

Question 41

مكونات رد الفعل ؟ reflex arc components

Answer 41

Receptor Afferent Center efferent effector

Question 42

Mention Charctertistics of Reflex ?

Answer 42

anis : -Automatic -NonConscious -Inborn -Standarized

Question 42

Mention Charctertistics of Reflex ?

Answer 42

-Automatic -NonConscious -Inborn -Standarized

Question 43

الحمدلله علي نعمه لاتعد ولا تحصي اعوذ بك ربي من كفران النعم

Question 44

types of relfelxed according to center

Answer 44

Cortical HypoThalamic Midbrain Medullary Spinal KHM2S كلمني كلام كهمس~ لم افهم منه شئ

Question 45

type of reflexex according to synapse

Answer 45

Mono Bi poly synaptic