Oribital Muscles

Question 1

What are the common characteristics in origin and insertion of all rectus extraocular muscles?

Answer 1

they all originate from a common annular tendon in the oribit
they all insert into the sclera in front of the coronal equator of the eyeball

Question 2

What is the common characteristic regarding the insertion of both oblique extraocular muscles?

Answer 2

both insert onto sclera on the lateral margin or the eyeball behind the coronal equator

Question 3

What is the common characteristic concerning the insertion of the superior and inferior rectus extraocular muscles?

Answer 3

they insert onto the sclera of the eyeball in front of the coronal equator and are displaced slightly medially

Question 4

What is the common characteristic regarding the insertion of both oblique extraocular muscles?

Answer 4

Both insert onto sclera on the lateral margin of the eyeball behind the coronal equator

Question 5

What is the embryonic origin of the extraocular muscles or extrinsic muscles of the eyeball?

Answer 5

the skeletal muscle is derived from the somites hence somatic efferent (SE)

Question 6

Which nerves will innervate specific extrinsic/extraocular muscles?

Answer 6

oculomotor- superior rectus, medial rectus, inferior rectus, inferior oblique
trochlear- superior oblique
abducens/abducent- lateral rectus

Question 7

Which of the cranial nuclei of termination contain primary afferent neurons?

Answer 7

mesencephalic nucleus of the trigeminal nerve

Question 8

What is the location of synapse for preganglionic parasympathetic efferent fibers of the third cranial nerve?

Answer 8

ciliary ganglion

Question 9

What is unique about the vascular supply of the retina?

Answer 9

a single vessel supplies it

Question 10

What vessel supplies the inner tunic of the eyeball?

Answer 10

central artery of the retina