Lacrimal System Innervation and Blood Supply (M1)

Question 1

CN V

Answer 1

Trigeminal nerve.
sensory innervation of the lacrimal gland.
V1 - ophthalmic nerve
Lacrimal nerve

Question 2

parasympathetic fibers

Answer 2

motor innervation of lacrimal gland.
glands = involuntary = autonomic = parasympathetic

Question 3

CN VII

Answer 3

facial nerve.
motor innervation of horner’s muscle
temporal and zygomatic branches innervate orbicularis muscle

Question 4

what arteries supply nasolacrimal apparatus

Answer 4

angular, infraorbital, and dorsonasal

Question 5

what artery supplies lacrimal gland

Answer 5

lacrimal artery

Question 6

course of the lacrimal artery

Answer 6

1. Branches from ophthalmic artery after entering orbit
2. Courses anteriorly, along upper border of lateral rectus
3. Supplies lacrimal gland
4. Pierces orbital septum to enter UL and LL as lateral palpebral arteries

Question 7

course of the medial palpebral arteries

Answer 7

1. Branch from ophthalmic artery after it enters orbit
2. Pierce orbital septum to enter UL and LL
3. Anastomose with lateral palpebral arteries to form palpebral arcades (marginal and peripheral).

Question 8

marginal palpebral arcade location and supply

Answer 8

anterior to tarsal plate.
supplies the UL and LL when eyelids are protracted.
supplies the cornea when eyelids are protracted.

Question 9

peripheral palpebral arcade location and supply

Answer 9

anterior to tarsal (Mullers) muscle.
supplies UL and LL near peripheral edge of tarsal plate.

Question 10

dorsonasal artery course

Answer 10

Terminal branch of ophthalmic artery
1. Courses near medial wall of the orbit
2. Pierces orbital septum
3. Travels alongside nose and anastomoses with angular artery
4. Supplies nasolacrimal apparatus and nose