Exam 1 Crash Course Deck Flashcards
When depolarized photoreceptors relay information to bipolar cells by synapsing in the
outer plexiform layer. Bipolar cell bodies are found in the
____________________ layer
Inner Nuclear
Bipolar cells relay information to ganglion cells. The synapse occurs in the
__________________ layer.
Inner plexiform
CN II: Axons from ganglion cells are conveyed in the nerve fiber layer toward the _______________?
optic disc
Optic nerve axons are mylinated by what structures?
interfascicular oligodendrocytes
- The optic tract travels around the ______________ and fibers synapse on one of three nuclei of termination.
cerebral peduncles
Optic Tracts 3 nuclei of termination are?
lateral geniculate body
superior colliculus
pretectal nucleus of the midbrain
From the lateral geniculate body the termination reaches _______________.
cerebral cortex in the occipital lobe (Brodmann area 17)
From the superior colliculus the termination reaches _______________.
tectospinal tract
From the pretectal nucleus of midbrain deal with _______________.
light reflexes
nuclei of origin for Oculomotor nerve
Oculomotor nuclei
where is the oculomotor nuclei is located?
in periaqueductal gray matter,
anterior to cerebral aqueduct,
at the level of the superior colliculi
What part of the cerebral cortex sends axons TO the oculomotor nuclei?
Broadmann area 8
The oculomotor nuclei also receives fibers from the which two structures?
Superior Colliculus
Medial Longitudinal Fasciculus (MLF)
Oculomotor axons travel anteriorly, through which structure?
Red Nucleus
Oculomotor axons exit CNS in through what structure?
Interpeduncular fossa (into the cistern)
Once in the eye socket, the oculomotor nerve splits into what two structures?
Superior and Inferior Rami
What muscles do the superior rami of the oculomotor nerve innervate?
superior rectus
levator palpebrae superioris
What muscles do the inferior rami of the oculomotor nerve innervate?
medial rectus
inferior rectus
inferior oblique
The accessory oculomotor nucleus has preganglionic parasympathetics, what is the other name for the accessory oculomotor
Edinger-Westphal Nucleus
Axons from the accessory oculomotor follow the Inferior Rami and synapses on what ganglion?
Ciliary ganglion
Postganlionic parasympathetic axons pierce the sclera and supply which structures?
Ciliaris
Pupillary constrictor
Nerves leaving the ciliary ganglion also carry
sympathetic and somatic sensory fibers from which nerve?
ophthalmic nerve; do not synapse
The Trochlear nucleus gives rise to lower motor neurons that cross at which point?
the midbrain
inferior to the inferior colliculi
The trochlear nucleus also receives fibers from which three structures?
superior colliculus
medial longitudinal fasciculus
Broadmann area 8
Communication with cavernous plexus and the trochlear nerve with what type of fibers?
Postganglionic sympathetic fibers
The trochlea pulley occurs where in the orbit?
Superior Medial aspect
abducens nucleus is located where in relation to the pons?
caudal part of the pons
at the floor of the rhomboid fossa
abducens nerve receives information from what structures?
superior colliculus
medial longitudinal fasciculus
Broadmann area 8
abducens nerve penetrates the dura, traveling along which structure before passing through the Superior Orbital Fissure?
along the Cavernous Sinus
