Lesson 4: The Skull

Question 1

How many bones make up the skull? How many are cranial bones and how many are facial bones?

Answer 1

22
8
14

Question 2

A single, convex bone extending from the orbits of the eye to the coronal suture, air-filled cavity, lined with mucous membrane

Answer 2

Frontal bone

Question 3

What are the articulations of the frontal bone?

Answer 3

12 bones: sphenoid, ethmoid, two parietal, two nasal, two maxillae, two lacrimal, and two zygomatic

Question 4

What forms the majority of the sides and roof of the cranial cavity, behind the frontal bone?

Answer 4

Parietal bones

Question 5

What are the articulations of the parietal bones?

Answer 5

Each parietal bone articulates with five bones: the contralateral parietal bone, the ipsilateral temporal bone, the occipital bone, the sphenoid bone, and the frontal bone.

Question 6

What forms that back and base of the skull?

Answer 6

Occipital bone

Question 7

What structures does that occipital bone consist of?

Answer 7

Hypoglossal canal, foramen magnum, and occipital condyles

Question 8

What is a groove that transmits the hypoglossal nerve?

Answer 8

Hypoglossal Canal

Question 9

A large opening in the floor of the posterior cranial fossa that transmits the spinal cord and vertebral arteries

Answer 9

Foramen magnum

Question 10

Oval-shaped condyles located on the inferior surface for articulation with the first vertebra, the atlas

Answer 10

Occipital condyles

Question 11

Bones that each contribute to the base and the lower, lateral aspect of the skull

Answer 11

Temporal bones

Question 12

What are the articulations of the occipital bone?

Answer 12

Two parietal bones, two temporal bones, the sphenoid bone, and the atlas (C1) vertebra.

Question 13

What are the temporal bones divided into?

Answer 13

Squamous, petrous, mastoid, and tympanic

Question 14

An arched process that articulates with the zygomatic bone

Answer 14

Zygomatic process (squamous)

Question 15

A shallow depression behind the zygomatic process that accommodates the mandibular condyle

Answer 15

Mandibular fossa (squamous)

Question 16

The circular external opening into the auditory canal

Answer 16

External acoustic meatus (tympanic)

Question 17

A narrow projection of bone passing downward and forwards, which gives attachment to several muscles

Answer 17

Styloid process (tympanic)

Question 18

A large prominence located immediately behind the external acoustic meatus; is the insertion point of the sternocleidomastoid muscle

Answer 18

Mastoid process (mastoid)

Question 19

A passage that transmits the internal carotid artery

Answer 19

Carotid canal (petrous)

Question 20

A pronounced depression that articulates with the occipital bone to form the jugular foramen (glossopharyngeal, vagus, and accessory nerves exit here)

Answer 20

Jugular fossa (petrous)

Question 21

What are the articulations of the temporal bone?

Answer 21

The occipital bone, the ipsilateral parietal bone, the sphenoid bone, the mandible, and the zygomatic bone.

Question 22

A single, midline bone that forms part of the nasal septum, the medial wall of the orbital cavity, and the roof and lateral wall of the nasal cavity

Answer 22

Ethmoid bone

Question 23

What are the articulations of the ethmoid bone?

Answer 23

The frontal bone, the sphenoid bone, two nasal bones, two maxillae, two lacrimal bones, two palatine bones, two inferior nasal conchae, and the vomer.

Question 24

A single bone located at the base of the skull that is often described as being “butterfly-shaped”

Answer 24

Sphenoid bone

Question 25

What are the articulations of the sphenoid bone?

Answer 25

The vomer, ethmoid bone, frontal bone, occipital bone, two parietal bones, two temporal bones, two zygomatic bones, and two palatine bones.