Transcript 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