Rhoton Collection

Question 1

The Atlas is the first cervical vertebra, and articulates with the base of the skull at the

Answer 1

Atlantal Condyle

Question 2

The articulation between C1 and C2 is unique in that C2 has a superior projection known as the

Answer 2

Odontoid process

Question 3

The adjacent cervical vertebra articulate with each other at the

Answer 3

Facet Joint - lies between the lateral mass of adjacent cervical vertebra

Question 4

There is a foramen along the lateral aspect of each cervical vertebra known as the

Answer 4

Transverse foramen - through which the vertebral artery courses on its way to supply the posterior circulation to the brain and brainstem.

Question 5

The Vertebral artery arises as a branch off the

Answer 5

subclavian artery

Question 6

The Vertebral artery enters the Transverse foramen most commonly at

Answer 6

C6

Question 7

The Vertebral artery’s venous counterpart most commonly enters the transverse foramen at

Answer 7

C7

Question 8

Four segments of vertebral artery

Answer 8

1 - arises off the subclavian and courses along its way to the transverse foramen.
2- runs within the transverse foramen up to C2.
3- once the artery traverses the transverse foramen of C2
4 - begins once the artery pierces the dura before merging with the contralateral vertebral artery to form the basilar artery, which supplies the posterior circulation to the brain and brainstem.

Question 9

The sphenoid bone is surrounded by
* anteriorly
* laterally
* posteriorly

Answer 9

Anterior: frontal and ethmoid bones
Lateral: squamosal temporal bone
Posterior: petrous temporal bone and occipital bone

Question 10

The petrous portion of the internal carotid
* exits
* passes over
* to

Answer 10

The petrous portion of the internal carotid
exits the petrous temporal bone
passes over the foramen lacerum
to the carotid groove of the sphenoid bone

Question 11

The carotid groove of the sphenoid bone is bounded laterally by

Answer 11

lingula of the sphenoid bone

Question 12

The paraclival segment of the internal carotid artery turns superiorly at the

Answer 12

carotid groove

Question 13

The carotid siphon is formed within the

Answer 13

cavernous sinus

Question 14

The carotid then passes between … into the supraclinoid segment

Answer 14

anterior and middle clinoid processes

Question 14

The optic nerve enters the optic canal, which is bounded laterally by

Answer 14

anterior clinoid process

Question 15

Midline structures of the skull base
anterior to posterior

Answer 15

cribiform plate of the ethmoid bone
planum sphenoidale (which roofs the sphenoid sinus)
tuberculum sella
sella turcica
clivus
foramen magnum

Question 16

The middle portion of the clivus is bounded laterally by

Answer 16

petroclival fissure (which the inferior petrosal sinus follows before terminating at the jugular foramen)

Question 17

jugular foramen is at the level of the

Answer 17

lower clivus

Question 18

The inferior petrosal sinus empties into
The sigmoid sinus empties into

Answer 18

petrosal part of the jugular foramen
sigmoid part of the jugular foramen

Question 19

Petrosal and sigmoid parts of the jugular foramen are separated by

Answer 19

intrajugular process of the temporal bone

Question 20

The internal auditory canal is located just superior to the

Answer 20

jugular foramen

Question 21

The second and third divisions of the trigeminal nerve exit into the pterygopalatine and infratemporal fossa through

Answer 21

the foramen rotundum and ovale

Question 22

The middle meningeal artery enters through the

Answer 22

foramen spinosum

Question 23

Where is the foramen spinosum relative to foramen ovale

Answer 23

posterolateral