Ciliary Ganglion

Question 1

Type

Answer 1

Parasympathetic

Question 2

Site

Answer 2

Lies near orbital apex between optic nerve and lateral rectus
It is suspended from Nasociliary nerve

Question 3

Roots (3)

Answer 3

1. Sensory root
2. Sympathetic root
3. Parasympathetic root

Question 4

Sensory root

Answer 4

Nasociliary nerve

Question 5

Sympathetic root

Answer 5

From sympathetic plexus around ICA

Question 6

Parasympathetic root

Answer 6

Oculomotor nerve through nerve to inferior oblique

Question 7

Branches definition

Answer 7

12-15 short ciliary nerves
Pierce eyeball back around optic nerve

Question 8

Branches

Answer 8

1. Sensory fibers
2. Sympathetic fibers
3. Parasympathetic postganglionic fibers

Question 9

Sensory fibers

Answer 9

Carry eyeball sensation

Question 10

Sympathetic fibers supply (2)

Answer 10

1. Dilator pupillae
2. Eyeball blood vessels

Question 11

Parasympathetic postganglionic fibers supply (2)

Answer 11

1. Ciliary muscle
2. Sphincter pupillae muscle

Question 12

Trochlear (4th cranial) nerve deep origin

Answer 12

Trochlear motor nucleas in midbrain

Question 13

Trochlear (4th cranial) nerve superficial attachment and exit from brain

Answer 13

Back of midbrain (right nerve comes from left nucleus and vice versa)

Question 14

Trochlear (4th cranial) nerve course and end

Answer 14

1. Curves forwards round midbrain (cerebral peduncle)
2. Passes between posterior cerebral and superior cerebellar arteries
3. Pierces dura at decussation point between Tentorium free and attached borders
4. It passes in cavernous sinus lateral wall
5. Enters orbit via superficial orbital fissure

Question 15

Trochlear (4th cranial) nerve branches

Answer 15

Supplies superior oblique muscle

Question 16

Abducent 6th cranial nerve deep origin

Answer 16

Abducent motor nucleus in pons

Question 17

Abducent 6th cranial nerve deep origin

Answer 17

Abducent motor nucleus in pons

Question 18

Abducent 6th cranial nerve superficial attachment and exit from brain

Answer 18

Lower border pons near midline

Question 19

Abducent 6th cranial nerve course and end

Answer 19

1. Pierces dura at petrous bone apex
2. Enter cavernous sinus cavity
3. Passes forwards lateral to ICA
4. Enters orbit through superficial orbital fissure

Question 20

Abducent 6th cranial nerve branches

Answer 20

Supplies lateral rectus muscle

Question 21

Abducent 6th cranial nerve applied anatomy: Injury (2)

Answer 21

Injury leads to:
1. Lateral rectus paralysis
2. Medial squint