Flashcards in THE HEAD - the orbit Deck (21):
What opening are located along the superior wall of the orbit?
What is the name given to the medial wall of the orbit?
What features may be observed on the medial wall of the orbit?
lacrimal groove, fossa for the lacrimal sac, anterior ethmoid foramen and posterior ethmoid foramen
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 in the inferior orbital fissure?
maxillary division of trigeminal nerve
What are the layers of the eyelid?
skin, orbicularis oculi muscle, tarsal plate/tarsus and palpebral conjunctiva
What are the names given to the modified sebaceous gland in the tarsus of the eyelid?
tarsal or Meibomian gland
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 ciliary gland?
the modified sebaceous gland at the base of the eyelash
What are the names given to the modified sebaceous glands of the palpebra?
tarsal gland or Meibomian gland and ciliary gland
What is the name given to the inner mucous membrane of the eyelid?
Which cranial nerves are involved in the Visceral Efferent (VE) parasympathetic pathway to the lacrimal gland?
facial and trigeminal (maxillary and opthlamic divisions/branches)
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
What are the names of the ganglion of synapse in the efferent pathway to the lacrimal gland?
pterygopalatine ganglion, sphenopalatine ganglion, Meckel's ganglion
Parasympathetic stimulation of blood vessels in the lacrimal gland will result in what events?
vasodilation of blood vessels, increased availability of water to secretory units, thinner or more watery product in lumen
What is the origin for the sympathetic pathway to the lacrimal gland?
lateral horn/intermediolateral cell column T1, T2
Sympathetic stimulation of the lacrimal gland will result in what events?
vasoconstriction of blood vessels, limited avilability of water to secretory units, more viscous or thicker product formed in glandular lumen
What are the names of the layers of the eyeball?
fibrous tunic, uveal tract and retina
What are the parts of the fibrous tunic of the eyeball?
cornea and sclera