Pons

Question 1

بسم الله الرحمن الرحيم وبه نستعين
ponst contains?

Answer 1

Vetnral basis pontis
Dorsal tegemntum pontiis

Question 2

Basis pontis contains ?

Answer 2

1-longitudinal fibers
2-transvers pontine fibers
3-Pontine Nuclei
____________________
Longitudinal fibers:
Corticospinal -CorticoNuclear-CorticoPontine fivbers
___________________-
Transverse pontine fibers form the Pontine Nuceli crossing formin MCP
_________________________
Pontince nuclei representing relay station between the cortex and cerebellum

Question 3

Contents of tegmentum pontis ?

Answer 3

Ascending and descendnig tracts
Cranial nueli of 5678
Reticular formation

Question 4

Tracts is the tegmentum pontis LIST

Answer 4

Medial Lemiscis
Medial longitdudinal fasciculus
Spinothalamic anterior spinocerebellar
Spinal tract and Nucelus of V
Central temgental tracct :
1-descending fibers from red nucleus to inferior olivary compex
2-ascdednging fibers from reticular formation to thalamus

Question 5

describe cochlera nuceli of CN8

Answer 5

VENTRAL AND DORSAL nuclei-
Ventral gives ventral and intermideate acousitc stirae
the dorsal givers dorsal acousitc striae….
The ventral cross and form trapezoid body and contiume in lateral leminsci
The dorsasl and intermediate may relay on Superior olivary or trapeziod nuclei of the same or opposite sides then to lateral lemiscis with the ventral

Question 6

Describe auditory pathway of CN 8

Answer 6

The organ of corti sends to the peripheral dendrites of the spiral ganglion reaching the central processes tha that forms the CN8 then to the ventral and dorsal Choclear Nuclei in the Pons
then giving Stirae Ventral and dorsal and intermediate
Ventral forms trepezoid body and cross to lateral leminsci
Dorsal and intermdeiate relay on trapeziod of superor oilvary then to lateral lemisci
then teritay afferents from trapezoif and SON ascends to inferio colliculis then medial geniculate to Audioty cortex !
Thanks

Question 7

The lateral lemiscus formed of ?

Answer 7

-Striae vental dorsal and Intermediate
-Fibers from superior olivary nucelus from same and opposite sides of body
-Fibers from the trapzoid body neuclus

Question 8

Efferent cochlear bundles explain ?

Answer 8

They are efferents of fibers from nuerons around superior olivary nucelus to the hair cells of organ of corrti to inhbits stimulation of auditory nerve and its responds to high frequncy impulses

Question 9

Describe vestibular nerve path

Answer 9

macule uritlcla macula saccula and crist ampularis sends to the preipheral of Vestibular ganglion so the cental fomrs the vestibular nerve relayin on the vestibular nuceli the superior and lateral in pons the inferior and medial in Medulla
the nuclei sends vestibulocerebellar fibers through ICP whetehre primary direct of secondary fibers
terminating on the flocculonodular lobe for equliibrium

Question 10

cONNCECTIONS OF vestibular nuclei

Answer 10

afferents :- from vestiublar nerve+ Cerebellum.
Efferents :-
To the Cerebellum
to spinal cord from lateral ves nucelus
To Medial longtudinal faascilus fo conjugate eye movements

Question 11

What is medial longutdinal bundles ?

Answer 11

ascending and descending fibers in brain stem and spinal cord to cervcial segments L
Asdcending :
Vestibular fibers form superior and medial ves nuceli to the CN 346 the fibers of 3 and 6 are connected together for conjuate mvments of eye

desdnding:
Reticulosinal
vsestibulospinal from medial v neucles
Tectospinal form supeerior colloiculius
Interstifial neulus of cajal

Question 12

Functions of medial longutidnal fascisulus ?

Answer 12

Coordination of reflexes of eye movements with neck muscles
Conjugate eye movemnts

Question 13

Describe Facial nerve nuclei

Answer 13

1-the motor nucelus of facial for muscles fo facial expressions platysma stylohyoid platysma
the dorsal part for upper face receving bilatral coorticonucelar fibers but the Ventral part for the lower face receving Only contrlateral corticonuclear fibers
________________________
2-SUperior Salivatory nucleus for ?
Sublingual submandiublar and buccal palate glands
___________________________-
Nucels solitarues gustatory part receving sensations of the anteiro 2//3 of the tongue
__________________________
Spinal nucelus of trigeminal receving exteroception from the skin of back of ear and External auditoy meatus

Question 14

Lateral rectus muscle supplied by?

Answer 14

Abducen CN6 of the smae side

Question 15

cONNECTIONS OF abducent nervve nucelus

Answer 15

Bilateral corticonucelar fibers
Fibers relay on the CN3 nucelus for Conjugate eye movements

Question 16

Trgimunal nuceli

Answer 16

Motor nucelus in pons
3 sensory nuceli :
Main sensory nuecleus
Spinal neucels of trigminal
Mesencephlaic nucelus

Question 17

Describe Path of trigiminal

Answer 17

-Opthalmic and maxillary and mandibular collectd in Trigeminal Ganglion then trigminal nerve formed and gives ascednign and descending fivers at mid level of PONS .
=Ascending Mesencsplaic nucelus for prorpiceptin
and Main sensory nucelsus that contiues as the ventral trigimnotalamic tract or the trigeminal le,iscsus TO VMPN TO Sensory cortex
=Descending fibers to the Spinal neuclus of trigminal giving fibers crossing then ascneds as the dorsal Trigimnotalamic Tract then to VPMN TO Sensory cortex

Question 18

cONNCECTION OF mesencephalic nucelus ?

Answer 18

Trgiminal moto nucelus for mastications
Trigimenal lemiscus

Question 19

Conncetions of Trigminal mtootr nucelus

Answer 19

Bilateral Corticonuclear fibers
Mesecencplaic nucelus of trifmenal for mastications

Question 20

الحمدلله رب العالمين