a. is the most slender cranial nerve

b. has its nucleus in the floor of the third ventricle

c. enters the orbit with the tendinous ring

d. lies medial to the internal carotid artery in the cavernous sinus

e. contains parasympathetic nerve fibres

answera.F   b.F   c.T   d.F   e.F
The trochlear nerve is the most slender of all the cranial nerves.
The nucleus is found at the floor of the fourth ventricle
It lies lateral tot he internal carotid artery
It is a pure motor nerve
 

a. gives off supratrochlear nerve which innervates the medial forehead

b. it supplies the lateral wall of the nose

c. innervates the cornea

d. carries within it the sympathetic fibres from the internal carotid plexus

e. supplies the sphenoidal air sinus

answera.F   b.T   c.T   d.T   e.T
The supratrochlear nerve is a branch of the frontal nerve.
It innervates the cornea and the sclera
It supplies the anterior and posterior ethmoidal air cells as well as the sphenoidal air sinus.

3. The optic nerve:

a. enters the middle cranial fossa through the same foramen as the ophthalmic artery

b. has the ciliary ganglion on its medial side

c. enters the middle cranial fossa medial to the internal carotid artery

d. contains more fibres in fetal than in adult life

e. has its longest course within the cranium

answera.T   b.F   c.T   d.T   e.F
The ciliary ganglion is situated on its lateral side.
The longest course is within the orbit.
 

a. supplies the second pharyngeal arch muscle

b. does not contain sensory nerve

c. supplies secretomotor fibres to the submandibular glands

d. exists the skull through the styloid foramen

e. lies lateral to the external carotid artery within the parotid gland

answera.T   b.F   c.T   d.T   e.T
It contains sensory component from the anterior two-third of the tongue and a small area of the external ear.
It supplies secretomotor fibres to the submandibular and sublingual glands but not the parotid glands.
 

a. the nasociliary nerve

b. the lacrimal nerve

c. the frontal nerve

d. the trochlear nerve

e. the abducent nerve

answera.T   b.F   c.F   d.F   e.T
Structures that enter the orbit through annulus of Zinn include: 
nasociliary nerve
abducent nerve
oculomotor nerve

6. The following are true about the autonomic system:

a. the sympathetic system originates in the posterolateral hypothalamus

b. the parasympathetic fibres enter the orbit through the inferior branch of the oculomotor nerve

c. Horner's syndrome can occur in aneurysm of the internal carotid artery

d. the parasympathetic postganglionic fibres that supply the lacrimal gland arise from the ciliary 
    ganglion

e. the accommodation reflex is mediated through the sympathetic pathway

answera.T   b.T   c.T   d.F   e.F
The parasympathetic nerve to the lacrimal gland arise from the pterygopalatine ganglion.
The accommodation reflex is mediated through the parasympathetic pathway.
 

a. deep petrosal nerve

b. greater petrosal nerve

c. nervus intermedius

d. zygomatic branch of the maxillary nerve

e. zygomaticotemporal nerve

answera.F   b.T   c.T   d.T   e.T
The parasympathetic supply to the lacrimal nerve begins in the lacrimal nucleus of the facial nerve. The preganglionic fibres travel via the nervus intermedius and its greater petrosal branch to synapse in the pterygopalatine ganglion. The postganglionic fibres enter the zygomatic branch of the maxillary nerve and travel via the zygomaticotemporal nerve to innervate the lacrimal gland. 
 

a. receives its blood supply chiefly from a branch of the ophthalmic artery.

b. contains capsule derived from the orbital septum

c. is divided into two lobes by the lateral horn of the aponeurosis.

d. receive sensory supply from the trigeminal nerve

e. has the same histological features as the salivary glands

answera.T   b.F   c.T   d.T   e.T
The lacrimal gland has no true capsule.

9. The following are true about the superior ophthalmic vein:

a. it is the main venous channel of the orbit

b. it is formed by the union between the facial vein and the temporal vein

c. it enters the cranium through the inferior orbital fissure

d. it passes backward in the orbit between the levator and the superior rectus muscle

e. it receives the central retinal vein

answera.T   b.F   c.F   d.F   e.T
The superior ophthalmic vein is formed by the union between the supraorbital vein and the facial vein.
It enters the cranium through the superior orbital fissure
It passes posteriorly and laterally beneath the superior rectus muscle
The central retinal vein either joins the superior ophthalmic vein or enters the cavernous sinus directly.

10. The following are true about the arterial supply of the orbit:

a. the ophthalmic artery arises from the internal carotid artery within the cavernous sinus

b. the central retinal artery enters the optic nerve on its superior surface

c. the ophthalmic artery terminates as the dorsal nasal artery

d. the medial rectus unlike other recti receives only one muscular artery

e. the eyelids are supplied mainly by branches of the external carotid artery

answera.T   b.F   c.T   d.F   e.F
The central artery enters the optic nerve on its inferior surface
The lateral rectus and not the medial rectus receives only one muscular artery
The eyelids are supplied mainly by the medial and the lateral palpebral arteries.