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Lab 7. Vision, Eyeball Movement & Balance System II. Vestibular Nerve Roots. 1. Vestibulocochlear nerve. 6. MLF. Facial Nerve. 4. 5. Vestibular Nuclei. 3. inferior cere- bellar peduncle. 2. Clinical axial stained slice @ medulla/pons transition. 1. 2.
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Lab 7 Vision, Eyeball Movement & Balance System II
Vestibular Nerve Roots 1 Vestibulocochlear nerve 6 MLF Facial Nerve 4 5 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? Parietal Eye Field Frontal Eye Field (FEF)
abducens nerve fibers 1 facial nerve fibers 2 Vestibular Nuclei 3 MLF 6 PPRF 5 abducens nucleus 4 What brainstem level is shown here? Caudal Pons
1 MLF Pons/midbrain transition
1 MLF trochlear nucleus 2 Caudal Midbrain
Oculomotor nerve roots 3 Oculomotor nucleus 1 MLF 4 2 Superior colliculus Transition b/t midbrain & thalamus
internal acoustic meatus 2 semicircular canals 3 1 VIII nerve reference line between base & tegmentum MLF 5 Abducens nucleus 6 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 Westphal nucleus 1 (nucleus?) 2 (nerve?) III nerve roots What brainstem level is shown here? Rostral Midbrain
1 Optic tract Lateral geniculate nucleus 2 Brachium of Superior colliculi 3 Pretectal area 4 Posterior commissure Superior Colliculus 5 6 Transition b/t midbrain & thalamus
Vitreous Body Retina B C A Lens 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 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 General area of descending hypothalamic fibers If this is a cervical slice, where are these going? Intermediolateral column of upper thoracic spinal cord Reticular formation
What is the blood supply to the following: Central Artery 1 Ophthalmic Artery 2 Internal Carotid A. 4 (these are all branches of?) 3 3 Middle Cerebral 5 Posterior Cerebral - Calcarine A. 6
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
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
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? Rostral Midbrain Level Posterior Commissure?
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