The Eyes Flashcards
When the ciliary muscles relax, the suspensory ligaments do what?
tighten
Parasympathetic innervation from which cranial nerve causes the ciliary muscles to contract?
CN III
When the ciliary muscles contract, the suspensory ligaments do what?
loosen
Vision over distance requires more or less light refraction to focus on the retina?
less
What provides innervation of the orbicularis oculi muscle?
facial nerve proper (CN VII)
What provides innervation of the levator palpebrae superioris muscle?
oculomotor nerve (CN III)
Which provides innervation for the superior tarsal muscle?
sympathetics from T1 spinal cord
Ptosis, caused by loss of function of the LPS muscle or the Superior tarsal muscle, could result from loss function of which nerves?
oculmotor nerve (CN III) or the sympathetic nerves from T1 spinal cord
Preganglionic sympathetic nerves from T1 destined for the superior tarsal muscle will synapse where?
the cervical ganglia
the Lacrimal gland is innervated by what nerve?
CN VII- greater petrosal branch
What is the pathway for the greater petrosal branch of CN VII to innervate the lacrimal gland?
pons -> greater petrosal hiatus -> pterygopalatine ganglion -> lacrimal gland
the cornea is innervated by which cranial nerve?
CN V-1
what is the function of the cornea?
to refract incoming light to focus onto the retina
Which pupillae muscle receives parasympathetic innervation from CN III?
sphincter pupillae muscle
Which pupillae muscle receives sympathetic innervation from T1 spinal cord nerves?
dilator pupillae muscle
