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Med School Yr 2 > Lacrimal Glands > Flashcards

Lacrimal Glands Flashcards

1
Q

what type of gland are lacrimal glands?

A

serous exocrine

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2
Q

what is the role of lacrimal glands?

A

secrete fluid onto the surface of the conjunctiva and cornea of eye

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3
Q

where is the lacrimal gland located?

A

within the lacrimal fossa - depression in the orbital plate of frontal bone

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4
Q

what are the 2 main parts of the lacrimal gland?

A

orbital
palprebral

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5
Q

how is lacrimal fluid secreted?

A
  • into excretory ducts
  • empty into the superior conjuncitval fornix
  • fluid spreads over cornea via blinking
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6
Q

what is the lacrimal apparatus responsible for?

A

draining the lacrimal fluid from orbit

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6
Q

how is lacrimal fluid drained from the orbit?

A
  • lacrimal fluid circulates the eye
  • accumulates in lacrimal lake
  • drains into lacrimal sac via canals
  • drains down nasolacrimal duct into inferior meatus of nasal cavity
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7
Q

what is the main arterial supply to the lacrimal gland?

A

lacrimal artery - branch of opthalmic

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8
Q

what is the venous drainage of the lacrimal gland?

A

superior opthalmic vein –> cavernous sinus

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9
Q

what is the lymphatic drainage of the lacrimal gland?

A

superficial parotid lymph nodes

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10
Q

what provides sensory innervation to the lacrimal gland?

A

lacrimal nerve -> opthalmic nerve -> trigeminal nerve

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11
Q

what are the anatomical borders of the lacrimal gland?

A

superior - zygomatic process of frontal bone
anterior - orbital septum
posterior - orbital fat
inferolateral - lateral rectus muscle

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12
Q

describe how parasympathetic nerve fibres stimulate fluid secretion from the lacrimal gland:

4 steps

A
  • greater petrosal nerve to the pterygoid canal (preganglionic)
  • synapse at pterygopalatine ganglion
  • maxillary nerve to the zygomatic nerve (postganglionic)
  • stimulates fluid secretion
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13
Q

describe how sympathetic nerve fibres inhibit fluid secretion from the lacrimal gland:

A
  • superior cervical ganglion to internal carotis and deep petrosal
  • join parasympathetic fibres in pterygoid canal and follow same route
  • synapse at pterygopalatine ganglion
  • maxillary nerve to the zygomatic nerve (postganglionic)
  • inhibit fluid secretion
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14
Q

acute dacryoadenitis

A

inflammation of the lacrimal glands due to viral and bacterial infection

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15
Q

chronic dacryoadenitis

A

inflammation of lacrimal glands due to non-infectious inflammatory condition

16
Q

Label the lacrimal apparatus

A
17
Q
A

Med School Yr 2 (96 decks)

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