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

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 slice @ medulla/pons transition

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

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

Pons/midbrain transition MLF 1 Pons/midbrain transition

1 MLF trochlear nucleus 2 Caudal Midbrain

Transition b/t midbrain & thalamus 3 Oculomotor nerve roots 1 Oculomotor nucleus MLF 4 2 Superior colliculus Transition b/t midbrain & thalamus

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

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

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

Transition b/t midbrain & thalamus 1 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

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

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

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

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?

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.

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

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 - 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

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

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