Orbit Flashcards
What opening is located along the superior wall of the orbit?
optic canal
What are the contents of the optic canal?
optic nerve and ophthalmic artery
What is the name given to the medial wall of the orbit?
lamina papyracea
What opening is located along the lateral wall of the orbit?
superior orbital fissure
What opening is located along the inferior wall of the orbit?
inferior orbital fissure
What is contained the inferior orbital fissure?
maxillary division of trigeminal nerve
What are the layers of the eyelid?
skin, orbicularis oculi muscle, tarsal plate/tarsus, & palpebral conjunctiva
What are the names given tot he modified sebaceous gland in the tarsus of the eyelid?
tarsal or Meibomian gland
What is the location of the Meibomian gland?
tarsus of the eyelid
What is the function of the Meibomian gland?
produces a thick, hydrophobic substance that prevents tears from overflowing onto the cheeks along the margin of the eyelid
What is the name of modified sebaceous gland at the base of the eyelash?
ciliary gland
Visceral efferent fibers conveyed int he seventh cranial nerve originate from which nucleus?
superior salivatory nucleus
Preganglionic visceral efferent fibers of cranial nerve VII will exit the pons in what nerve?
nervus intermedius, nerve of Wrisberg, sensory root of facial nerve
Which immediate branch of the seventh cranial nerve will convey preganglionic parasympathetic efferent fibers tot he lacrimal gland?
greater petrosal or greater superficial petrosal nerve
What is the continuation of the greater petrosal nerve of the seventh cranial nerve?
vidian nerve or nerve of the pterygoid canal
What are the names of the ganglion of synapse in the efferent pathway to the lacrimal gland?
pterygopalatine ganglion, sphenopalatine ganglion, Meckel’s ganglion
Postganglionic parasympathetic efferent fibers from the pterygopalatine, sphenopalatine, sphenopalatine or Meckel’s ganglion will become incorporated in which cranial nerve branch?
maxillary nerve of the trigeminal
The zygomaticotemporal nerve will convey postganglionic parasympathetic efferent fibers to the lacrimal gland through a communication with which branch of the fifth cranial nerve?
ophthalmic nerve
Sympathetic stimulation of the lacrimal gland will result in what events?
vasoconstriction of blood vessels, limited availability of water to secretory units, more viscous or thicker product formed in glandular lumen
Parasympathetic stimulation of targets in the lacrimal gland will result in what events?
Vasodilation of blood vessels, increased availability of water to secretory units, thinner or more water product in lumen;
constriction of myoepithelial cells leading to release of product from secretory lumen into duct system
