Download BB Lab 7

Lab 7
Vision, Eyeball Movement &
Balance System II
Vestibular Nerve
1
Roots
Vestibulocochlear
6
nerve
Vestibular
3
Nuclei
MLF
4
Facial
5
Nerve
inferior cere2
bellar peduncle
Clinical axial stained slice @ medulla/pons transition
1
What eye field is located
here?
Frontal Eye Field (FEF)
2
What eye field is
located here?
Parietal Eye Field
abducens
nerve1fibers
facial nerve
fibers 2
Vestibular
3
Nuclei
PPRF
abducens 5
4
nucleus
MLF
6
What brainstem level is shown here?
Caudal Pons
MLF
1
Pons/midbrain transition
1
MLF
trochlear
2 nucleus
Caudal Midbrain
Oculomotor
nerve roots
3
Oculomotor nucleus
1
Superior colliculus
2
MLF
4
Transition b/t midbrain & thalamus
internal
acoustic
meatus
2
semicircular
3
canals
VIII 1
nerve
reference line
between base
& tegmentum
MLF
5
Abducens
6nucleus
Vestibular nuclei
4
What brainstem level is shown here?
Caudal Pons
What is the approximate location of the MLF?
MLF
What brainstem level is shown here?
Rostral Pons
PAG, with Edinger
1 (nucleus?)
Westphal
nucleus
2III(nerve?)
nerve roots
What brainstem level is shown here?
Rostral Midbrain
Optic tract
1
Lateral geniculate
2
nucleus
Brachium of
3
Superior colliculi
Pretectal area
4
Posterior
5
commissure
Superior
6
Colliculus
Transition b/t midbrain & thalamus
LensA
Vitreous
Body
B
Retina
C
Eyeball
Sphenoidal
Sinus
Optic Nerve
Hypophysis
Temporal Lobe
Gray Matter
Basilar
Artery
CSF in Sulcus
Pons
4th Ventricle
Cerebellum
Start with A
AFFERENT LIMB OF
PUPILLARY REFLEX:
optic nerve1
optic chiasm
2
optic tract
3
OPTIC4TRACT
POSITION OF:
oculomotor
1 (nerve?) nerve
oculomotor nerve roots
2 (roots?)
Edinger Westphal Nucleus
3 (nucleus?)
Reticular1formation
General
of descending
If this is area
Intermediolateral
a cervical
column
slice, of
hypothalamic
fibers
where thoracic
upper
are these
spinal
going?
cord
INTERNAL
2 CAROTID ARTERY
What is the blood supply to the following:
Central Artery
1
Ophthalmic
Artery
2
4 (theseCarotid
Internal
are all A.
branches of?)
3
Middle Cerebral
5
6
Posterior
Cerebral
- Calcarine A.
Abducens Nucleus
-Motor neurons to lateral rectus m.
-Interneurons send fibers to MLF
What is the ~location of the:
MLF?
PPRF?
Abducens Nucleus?
Abducens Nerve Fibers?
Rostral Medulla Level
MLF – en route
to midbrain
extraocular
motor neuclei
What is the ~location of the MLF?
Rostral Pons Level
What is the ~location of the MLF?
Rostral Pons Level
What is the ~location of the:
MLF?
Trochlear Nucleus?
Caudal Midbrain Level
What is the ~location of the:
Superior Colliculi?
Superior Colliculi Commissure?
MLF?
Oculomotor Nucleus?
Oculomotor Nerve Fibers?
Rostral Midbrain Level
What is the ~location of the:
MLF?
Superior Colliculi?
Superior Colliculi
- receives impulses from retina &
visual cortex
- sends axons to Edinger-Westphal
nucleus for lens accommodation
Rostral Midbrain Level
pretectal area
- a synaptic center for light reflexes
- receives input from retina
-sends axons to Edinger-Westphal nucleus
for pupillary light response
posterior commissure
- dorsal to cerebral
aqueduct
= decussation of fibers
between pretectal nuclei
-> bilateral (consensual)
light response
What is the ~location of the:
Superior Colliculi?
Brachium of the Superior Colliculus?
Pretectal Area?
Posterior Commissure?
brachium of superior
colliculus -optic tract fibers that
bypass lateral geniculate nucleus to reach
pretectal area & superior colliculus
Rostral Midbrain Level
Edinger-Westphal nucleus - in oculomotor complex (pale part)
- a preganglionic parasympathetic nucleus
- receives fibers from the pretectal area & superior colliculi
- sends axons via III C.N. to ciliary ganglion for pupillary constriction and lens accommodation
oculomotor nerve fibers - axons from
Edinger-Westphal nucleus to ciliary ganglion
What is the ~location of the:
Edinger-Wesphal Nucleus?
Superior Colliculi?
Rostral Midbrain Level