1. Vision, Eyeball Movement & Balance System II
Lab 7
Vision, Eyeball Movement & Balance System II

2. Clinical axial stained slice @ medulla/pons transition
Vestibular Nerve
Roots 1
Vestibulocochlear
nerve 6 4
MLF 5
Facial
Nerve
Vestibular
Nuclei 3
inferior cere-
bellar peduncle 2
Clinical axial stained medulla/pons transition

3. 1 2
What eye field is located here?
What eye field is located here?
Frontal Eye Field (FEF)
Parietal Eye Field

4. What brainstem level is shown here?
abducens
nerve fibers 1
facial nerve
fibers 2
Vestibular
Nuclei 3
PPRF
MLF 6 5
abducens
nucleus 4
What brainstem level is shown here?
Caudal Pons

5. Pons/midbrain transition
MLF 1
Pons/midbrain transition

6. 1
MLF
trochlear nucleus 2
Caudal Midbrain

7. Transition b/t midbrain & thalamus3
Oculomotor nerve roots 1
Oculomotor nucleus
MLF 4 2
Superior colliculus
Transition b/t midbrain & thalamus

8. What brainstem level is shown here?
internal
acoustic
meatus 2
semicircular
canals 3 1
VIII nerve
reference line
between base
& tegmentum
MLF 5 6
Abducens
nucleus
Vestibular nuclei 4
What brainstem level is shown here?
Caudal Pons

9. What is the approximate location of the MLF?
What brainstem level is shown here?
Rostral Pons

10. What brainstem level is shown here?
PAG, with Edinger
Westphal nucleus
1 (nucleus?)
2 (nerve?)
III nerve roots
What brainstem level is shown here?
Rostral Midbrain

11. Transition b/t midbrain & thalamus1
Optic tract
Lateral geniculate
nucleus 2 3
Brachium of
Superior colliculi
Pretectal area 4
Posterior
commissure 5
Superior
Colliculus 6
Transition b/t midbrain & thalamus

12. Start with A B C A Vitreous Body Retina Lens Eyeball Sphenoidal Sinus
Hypophysis
Optic Nerve
Temporal Lobe Gray Matter
Basilar Artery
CSF in Sulcus
Pons
4th Ventricle
Cerebellum
Start with A

13. 4 AFFERENT LIMB OF PUPILLARY REFLEX: optic nerve optic chiasm
optic tract 4
OPTIC TRACT 1 2 3

14. POSITION OF:
oculomotor nerve
oculomotor nerve roots
Edinger Westphal Nucleus
1 (nerve?)
2 (roots?)
3 (nucleus?)

15. 1 2 INTERNAL CAROTID ARTERY Reticular formation
General area of descending
hypothalamic fibers
Intermediolateral column of
upper thoracic spinal cord
If this is a cervical slice,
where are these going?

16. What is the blood supply to the following:1
Central Artery
Ophthalmic Artery 2
Internal Carotid A.
4 (these are all branches of?) 3 3 5
Middle Cerebral 6
Posterior Cerebral
- Calcarine A.

17. What is the ~location of the: MLF?
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

18. MLF – en route to midbrain extraocular motor neuclei
What is the ~location of the MLF?
Rostral Pons Level

19. What is the ~location of the MLF?
Rostral Pons Level

20. What is the ~location of the:
MLF?
Trochlear Nucleus?
Caudal Midbrain Level

21. What is the ~location of the:
Superior Colliculi?
Superior Colliculi Commissure?
MLF?
Oculomotor Nucleus?
Oculomotor Nerve Fibers?
Rostral Midbrain Level

22. What is the ~location of the: MLF?
Superior Colliculi
- receives impulses from retina & visual cortex
- sends axons to Edinger-Westphal nucleus for lens accommodation
What is the ~location of the:
MLF?
Superior Colliculi?
Rostral Midbrain Level

23. What is the ~location of the: Superior Colliculi?
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
brachium of superior colliculus -optic tract fibers that bypass lateral geniculate nucleus to reach pretectal area & superior colliculus
What is the ~location of the:
Superior Colliculi?
Brachium of the Superior Colliculus?
Pretectal Area?
Posterior Commissure?
Rostral Midbrain Level

24. What is the ~location of the: Edinger-Wesphal Nucleus?
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