The Eyeball, and Muscles and Nerves Flashcards
What are the parts of the uveal tract of the eyeball?
iris, ciliary body, choroid and pupil
what muscles are present in the iris?
sphincter pupillae and dilator pupillae
what is the innervation of the sphincter pupillae?
oculomotor nerve, parasympathetic pathway
what is the innervation of the ciliaris muscle?
oculomotor nerve, parasympathetic pathway
what is the function of the rod cell?
provide vision in dim light conditions
what is the function of the cone cell?
provide vision in bright light conditions and mediate color vision
what is the most numerous photoreceptor cell?
rod cell
what forms the optic nerve?
axons of ganglion cells
what occurs at the optic chiasma??
part of the optic nerve decussates
what is the location of the anterior chamber of the eyeball?
between the cornea and iris
what is the location of the posterior chamber of the eyeball?
between the iris and lens
what is contained in the anterior chamber of the eyeball?
aqueous humor
what is contained in the posterior chamber of the eyeball?
aqueous humor
what is the name given to the chamber behind the lens?
vitreous chamber
what fills the vitreous chamber?
vitreous fluid
what are the common characteristics in origin and insertion of all rectus extraocular muscles?
they all originate from a common annular tendon in the orbit
and
they all insert into the sclera in front of the coronal equator of the eyeball
what is the common characteristic regarding the insertion of both oblique extraocular muscles?
both insert onto sclera on the lateral margin of the eyeball behind the coronal equator.
what is the common characteristic concerning the insertion of the superior and inferior rectus?
they insert onto the sclera of the eyeball in front of the coronal equator and are displaced slightly medially.
what is the embryonic origin of the extraocular muscles or extrinsic muscles of the eyeball?
the skeletal muscle is derived from the somites hence somatic efferent (SE)
which nerves will innervate specific extrinsic/extraocular muscles?
oculomotor= superior rectus, medial rectus, inferior rectus, inferior oblique
trochlear= superior oblique
abducens/abducent = lateral rectus
which of the cranial nuclei of termination contain primary afferent neurons?
mesencephalic nucleus of the tirgeminal nerve
what is the location of synapse for preganglionic parasympathetic efferent fibers of the third cranial nerve?
ciliary ganglion
what is unique about the vascular supply of the retina?
a single vessel supplies it
what vessel supplies the inner tunic of the eyeball?
central artery of the retina
