Unit II - C.N. III - Oculomotor Nerve

Question 1

What type of nerve is the oculomotor nerve?

Answer 1

motor

Question 2

The oculomotor nerves supply all extraocular muscles except for which two?

Answer 2

Superior oblique

Lateral rectus

Question 3

The oculomotor nerve carries both _______ and _____ fibers.

Answer 3

Somatic and parasympathetic (preganglionic)

Question 4

Oculomotor nuclei are what type?

Answer 4

Somatic nuclei of origin

Question 5

Oculomotor nuclei are located where?

Answer 5

In the periaqueductal gray matter, anterior to cerebral aqueduct.

Question 6

The oculomotor nuclei are at the level what?

Answer 6

The superior colliculus

Question 7

What part of the cerebral cortex sends axons TO the oculomotor nuclei?

Answer 7

B.A. 8 - motor cortex

Question 8

What other two areas do the oculomotor nuclei receive information from?

Answer 8

Superior colliculus

Medial longitudinal fasciculus

Question 9

Axons travel forward from nuclei and go through what area?

Answer 9

The red nucleus

Question 10

After passing through the red nucleus the fibers exit the CNS through the ______ and go into the ______?

Answer 10

The interpeduncular fosse

cistern

Question 11

Once the fibers leave the CNS what are they covered by what and why?

Answer 11

epineurium because now in PNS

Question 12

After leaving the CNS the axons penetrate what?

Answer 12

The dura mater

Question 13

After penetrating the dura mater the axons travel along the __________ and exit the skull through what opening?

Answer 13

Cavernous sinus

Superior orbital fissure

Question 14

Once in the eye socket the oculomotor nerve splits into what?

Answer 14

Superior and inferior rami

Question 15

What muscles are supplied by the superior ramus?

Answer 15

Superior rectus

Lavatory palpebrae superioris

Question 16

The inferior rectus divides into three branches called?

Answer 16

Medial, central, lateral

Question 17

The medial branch of the inferior rectus supplies what muscle?

Answer 17

Medial rectus

Question 18

The central branch of the inferior rectus supplies what muscle?

Answer 18

Inferior rectus

Question 19

The lateral branch of the inferior rectus supplies what muscle?

Answer 19

inferior oblique

Question 20

The accessory oculomotor nucleus contains what type of fibers?

Answer 20

Preganglionic parasympathetic neurons

Question 21

Axons from the accessory nucleus follow what?

Answer 21

The oculomotor nerve

Question 22

Axons from the accessory nucleus synapse where?

Answer 22

In the ciliary ganglion

Question 23

The ciliary ganglion is located ____ anterior to what?

Answer 23

1 cm

Superior orbital fissure

Question 24

Postganglionic parasympathetic fibers from the ciliary ganglion follow the course of what?

Answer 24

The ciliary arteries

Question 25

The postganglionic parasympathetic fibers from the ciliary ganglion pierce the ______ and travel along what?

Answer 25

sclera

The internal surface of the sclera

Question 26

The fibers from the accessory oculomotor nuclei supply what muscles?

Answer 26

Papillary constrictor (aka sphincter pupillae)
ciliaris muscle

Question 27

Nerves leaving the ciliary ganglion also carry what two types of fibers?

Answer 27

Sympathetic and somatic sensory

Question 28

Sympathetic and somatic sensory fibers that are also in ciliary ganglion were picked up from what?

Answer 28

The ophthalmic nerve -V1 - ophthalmic divison

Question 29

Do these “other fibers” from V1 synapse in the ciliary ganglion?

Answer 29

No, they just pass through