CN II Optic Flashcards
The optic vesicle is derived from this, an embryological derivative
Prosencephalon
The optic nerve is an extension of what?
Brain
Optic nerves are composed of axons from what layer of the retina?
Ganglionic layer of retina
Axons of ganglionic neurons of the retina form what?
Layer of the optic nerve
What is the outer layer of the eyeball?
Fibrous tunic
What are the two components of the fibrous tunic?
Sclera and cornea
This occupies the posterior 4/5ths to maintain the shape of the eyeball
Sclera
This occupies the anterior 1/5th and is transparent for light pass
Cornea
What are the three components of the vascular tunic?
Iris
Ciliary Body
Choroidea
What is another term for vascular tunic?
Uvea
What is the anterior part of the vascular tunic?
Iris
What is the posterior part of the vascular tunic?
Choroidea
What is the anterolateral part of the vascular tunic?
Ciliary body
In the internal or sensory tunic of the eye (retina), how many layers are present?
10
This is also known as Jacob’s membrane?
Rods and cones
The retina has this cell type between the internal and external limiting membranes
Glial cells of Muller
Transversally connecting cells in the outer plexiform layer
Horizontal cells
Cells in the inner plexiform layer
Amacrine cells
All the optic nerves in the layer of the nerve fibers converge toward this
Optic papilla or optic disc
The optic disc penetrates the choroid and sclera at this location
Lamina cribrosa
The optic nerve enters the cranial cavity through this on the sphenoid bone
Optic canal
What runs with the optic nerve through the optic canal?
Ophthalmic artery
The right and left optic nerves form this
Optic chiasma
The optic nerves from what half of both eyes decussate?
Nasal half
From the chiasma, the optic tracts run around the cerebral peduncles to this
Lateral geniculate bodies
The optic tract of a single eye is composed of what?
Fibers from the lateral half of the eye on the same side and nasal half of the eye on the opposite side
What are the three nucleuses of termination?
Lateral geniculate body
Pretectal
Superior colliculus
Which is the principal nucleus of termination?
Lateral geniculate body
The lateral geniculate body projects as an optic radiation to which Brodmann area?
Brodmann 17
Which gyrus is included in Brodmann area 17?
Cuneus gyrus
This nucleus of termination is for the reflex movement of the sphincter pupillae
Pretectal
The pretectal nucleus of termination goes through what nucleus and ganglion?
Edinger-Westphal nucleus
Ciliary ganglion
What nucleus of termination projects for the reflex movement of the head and neck through the ventral column of the cervical cord?
Superior colliculus
The right an left cortical center of vision are connected through what?
Corpus callosum
The three tunics that make up the wall of the eyeball is continuous from what?
Meninges
The outer sheath from the dura blends with what?
Sclera
The intermediate sheath is continuous from what?
Arachnoid mater
The intermediate sheath is separated from the outer by what?
Subdural space
The intermediate sheath is separated from the inner by what?
Subarachnoid space
The inner sheath is continuous with what?
Pia mater
The pia mater is vascular and closely invests what nerve?
Optic nerve
Increased pressure due to excess fluid in the general subarachnoid space from an intracranial neoplasm
Papillodema
Optic tract lesion only affecting half of the visual field
Hemianopia or hemianopsia
Peripheral degeneration of visual field
Tunnel vision
