Mid brain Flashcards
بسم الله الرحمن الرحيم وبه نستعين
The Only cranial Nerve that decussates ?
CN4 tROCHLEAR
mENTION Part of Midbrain
-Tectum containing 4 Colliculi
-Tegemnutimum as tegmuntim pontis reticular formation contiunuation containing 3 ,4 cranial nerves nucelus and red nucels and reticular formation
Crus cerebri replacing basis pontis containg desending cortical projections
Crus cerebri contains?
it contiuation of basis pontis
containing descending cortical fibers
Medially frontopontine
Intermediate : CorticoNuclear+Corticospinal
Laterally: Parieto-occipto-temopro pontine fibers
Inferior colliculi function afferents and efferents
Function :-Relay for auditory pathway
Afferents:-
lateral leminsci
Cortical Auditory area
inferior colliculus of opposite
superior coliiculus of same
_______________________
Efferents:
Inferior collciuli of oppsite
superior colliculi of same
Medial Genicualte body of thalamus
________________________
Postition CN4
Dorsal to periaqudetal gray at the level of inferior colliculus
deucssate to supply Superior Oblique muscle
Superrior Oblique Muscle is supplied by >?
Trochlear nerve CN4
nUCEUS OF CN IV CONNECTIONS
-Bilateral corticonuclear fibers
-Medial Longutidnal bundles
Describe substanitia Nigra
Between the Tegmntum and Crus cerebri at level of superior colliculus
Pars compacta : melanin+ dopamine lesion = parkinson
Pars Reticularis : large neurons
Superior colliculus site and layres
superior level of Tectummmm
alternating white and grey mater
ZCOL
Stairtum zonale
stiratum Cinerum
Straitum opticum
straitum Lemisci ?
Functions afferets and efferents of SUPERIOR COLLICULI
Relay for visualpathawy
_______________
afferents:
Retintectal:crossed and uncrossed
CorticoTectal : from cvisual cortex
brainstem:
From inferior colliculus of same side
commisural from opposite side
from auditory path
Spinotectal
Efferets:
Tectospinal some to MLF
Tecto-Pontine
Tecto-reticular formation of midbrain
Occlumotor nucelus lies at which level ?
Level of superior collicul
Occulumotor nucelus consists of >?
Paird lateral cell column + Caudate central nucelus for all extraoucclea muscles escept superior oblique by 4th and lateral rectus 6th
_______________________
Edinger wetephal nucelus for? paraympahthaic Ciliary muscle+sphincter pupillae muscle
_______________________
Courese and connections of 3rd cn nuelus
To red nucleus to interpedunclar fossa
_____________________
Conncection
bilateral corticonucelar
vestibular
abucent nuclei
Position and chracters of red nucelus
at tegmeuntm of mid brain
at level of suprior colliculs
punkish due to high vascularity
surrounded by fibers of superior cerebellar peduncel
transversed by Rootlets of occlumotor
parts of Red Nucleus
Caudal part magnocellular for motor function
Central part parivcellular for motor learning
