Flashcards in Lacrimal Gland Deck (32):
What is the location of the lacrimal gland?
Lacrimal fossa of frontal bone in superolateral part of orbital wall
What rests in the lacrimal fossa?
Orbital part of lacrimal gland
What is the name given to the part of the lacrimal gland outside of the lacrimal fossa?
Palpebral part of lacrimal gland
What are the parts of the lacrimal gland?
Orbital and palpebral parts
The lacrimal gland is an example of what classification of gland?
What is the single common characteristic of exocrine glands?
Ducts drain product from the secretory units of the gland
In what location will the lacrimal gland ducts open?
Superior and inferior lacrimal canaliculi drain into what structure?
What is the name of the structure draining the lacrimal sac?
The nasolacrimal duct will open into what specific location?
Inferior nasal meatus of nasal cavity
What is the drainage pattern of tears?
- lacrimal punctum
- lacrimal canaliculus
- lacrimal sac
- nasolacrimal duct
- inferior nasal meatus
Visceral Efferent (VE) pathways innervate what structures?
Smooth muscle, cardiac muscle, and glandular tissues
What specific pathways are identified with VE innervation?
Sympathetic and parasympathetic motor pathways
How many neurons are involved in the VE pathways from CNS to target cell?
Two motor neurons
What is the location for the second neuron in the VE pathway?
Typically a ganglion
Which VE pathway is conveyed in the seventh cranial nerve?
A parasympathetic motor pathway
Which cranial nerves are involved in the VE parasympathetic pathway to the lacrimal gland?
Facial and trigeminal (maxillary and ophthalmic divisions/branches)
VE fibers conveyed in the seventh cranial nerve originate from which nucleus?
Superior salivary nucleus
Preganglionic visceral efferent fibers of cranial nerve VII will exit the pons into 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
Postganglionic parasympathetic efferent fibers from the pterygopalatine, sphenopalatine, or Meckel's ganglion will become incorporated in which cranial nerve branch?
maxillary nerve of the trigeminal
The maxillary nerve will convey postganglionic parasympathetic efferent fibers to the lacrimal gland through a communication with which branch of the fifth cranial nerve?
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
The sympathetic pathway to the lacrimal gland will involve what nerural components?
- spinal nerves
- a neurovascular plexus around blood vessels
What is the origin for the sympathetic pathway to the lacrimal gland?
lateral horn/intermediolateral cell column T1, T2
What is the target of the preganglionic sympathetic VE fiber in the pathway to the lacrimal gland?
the VE fiber ascends to the superior cervical ganglion to synapse
What is the pathway for the postganglionic sympathetic VE fiber to the lacrimal gland?
it joins the internal carotid artery neurovascular plexus and continues along the ophthalmic artery to the lacrimal gland where it synapses
What will sympathetics specifically control in the pathway to the lacrimal gland?
vasomotor fibers to smooth muscle of blood vessels
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
What cells of the lacrimal gland will cause the product to be released from the secretory unit?
What neural pathways target the myoepithelial cell?
primarily the parasympathetic system