a. lies in the floor of the middle ear

b. lies medial to the abducent nerve

c. enters the skull and divides into the anterior and middle cerebral arteries

d. is separated from the external carotid artery by the styloglossus

e. grooves the greater wing of the sphenoid bone

answera.T   b.T   d.T   d.T   e.F
The groove forms by the internal carotid artery is found on the body of the sphenoid bone.

2. The internal jugular vein:

a. is separated from the sympathetic chain by the prevertebral fascia

b. lies anteromedial to the sympathetic chain.

c. is a continuation of the sigmoid sinus 

d. receives the anterior jugular vein

e. is separated from the inferior petrosal sinus by the 9th, 10th and 11th cranial nerves 

answera.T   b.F   c.T   d.F   e.T
The internal jugular vein lies anterolateral to the sympathetic chain.
The anterior jugular vein enters the external jugular vein which enters the subclavian vein.

3. The following are true about the trigeminal nerve:

a. it supplies the muscle of mastication

b. its ganglion lies on the apex of the petrous bone

c. emerges from the brain stem between the pons and the medulla

d. emerges from the brain stem as separate sensory and motor roots

e. innervates all the teeth of the upper jaw

answera.T   b.T   c.F   d.T   e.T
It emerges from the brain stem at the junction between the pons and the middle cerebellar peduncle.

4. The following nerves are transmitted through the temporal bone:

a. vagus nerve

b. facial nerve

c. vestibulocohclear nerve

d. mandibular branch of the trigeminal nerve

e. olfactory nerve

answera.F   b.T   c.T   d.F   e.T
Only the facial nerve and the vestibulocochlear nerves are transmittedthrough the temporal bone.
Olfactory nerve through the frontal bone.
Vagus nerve through the jugular foramen
Mandibular nerve through the sphenoid bone
 

5. The following are true about the circulation of the  cerebrospinal fluid (CSF):

a. is produced by the modified ependymal cells of the choroid plexus

b. is absorbed mainly through the arachnoid granulations in the superior sagittal sinus

c. the ventricular system communicates with the subarachnoid space through the roof of the 
    third ventricle

d. the arachnoid granulation is in contact with the endothelium of the venous sinuses

e. blockage of the arachnoid granulation causes communicating hydrocephalus

answera.T   b.T   c.F   d.T   e.T
The ventricular system communicates with the subarachnoid space in the roof of the third ventricle.
 

a. contains the spinal nucleus of the trigeminal nerve which extends throughout the length of 
    the medulla

b. the vagus nerve emerge between the medulla and the inferior cerebellar peduncle

c. contains gracile nucleus which lies medial to the cuneate nucleus

d. the vagal nucleus lies medial to the hypoglossal nucleus

e. the pyramids decussate in the lower part of the medulla

answera.T   b.T   c.T   d.F   e.T
The vagal nucleus lies lateral to the hypoglossal nucleus.
 

a. supplies parasympathetic fibres to the lacrimal gland

b. sympathetic nerves from the superior cervical ganglion passes through it

c. is suspended from the maxillary nerve

d. supplies the iris

e. supplies secretomotor fibres to the glands of the nose

answera.T   b.T   c.T   d.F   e.T
The ganglion does not supply the iris. 
 

a. are found on the anterior surface of the thyroid glands

b. develops from the 3rd and 4th pharyngeal pouch endoderm

c. may be confused with fat globules

d. receives blood supply from the middle thyroid arteries

e. contain chief cells which have dark staining nuclei

answera.F   b.T   c.T   d.F   e.T
They are found on the posterior surface of the thyroid glands
They receive blood supply from the superior and inferior thyroid arteries.

9. True statements about the boundary of the nasal cavity include:

a. cribriform plate forms part of the roof

b. maxilla forms the floor of the cavity

c. vomer forms the lateral wall of the cavity

d. palatine forms part of the roof

e. the vertical plate of the ethmoid bone forms the medial wall

answera.T   b.T   c.F   d.F   e.T
The roof of the nasal cavity is formed by the cribriform plate of the ethmoid bone, the frontal bone and the nasal cartilage
The maxilla and the palatine forms the floor of the cavity
The medial wall is formed by the septal cartilage, vomer and the vertical plate of the ethmoid bone
The ethmoid and palatine form the lateral wall.
 

a. it lies on the body of the sphenoid bone

b. it is situated above the pituitary gland

c. it is posterior to the superior orbital fissure

d. the maxillary branch of the trigeminal nerve passes through it

e. the trochlear nerve passes through it

answera.T   b.F   c.T   d.T   e.T
The sinus is situated on either side of the pituitary gland
The ophthalmic branch and the maxillary branch of the 
trigeminal nerve passes through it but not the mandibular branch.
 
 

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