9.2 The skull and cranial nerves

Question 1

How many bones are in the skull?

Answer 1

22 bones

Question 2

What is the roof of the cranial cavity called?

Answer 2

Cranial vault

Question 3

What is the floor of the cranial cavity called?

Answer 3

Cranial base

Question 4

Name the bones of the cranium

Answer 4

2 Frontal, 2 Parietal, 1 Occipital, 2 Temporal, 1 Sphenoid, 1 Ethomoid

Question 5

What are the 3 sutures of the skull?

Answer 5

Coronal, Sagittal and Lambdoidal

Question 6

What is on the floor of the cranium?

Answer 6

3 levels- Anterior, Middle and Posterior cranial fossa

Question 7

Name the boundaries of the Anterior cranial fossa

Answer 7

Frontal bone, Lesser wing of sphenoid, Orbital plates of the frontal bone

Question 8

Name the boundaries of the Middle cranial fossa

Answer 8

Lesser wing of Sphenoid, Petrous portion of temporal bone, Temporal bone laterally

Question 9

Describe the Sphenoid bone

Answer 9

Forms the anterior and middle cranial fossa, connects the orbits with cranial cavity

Question 10

Name the boundaries of the Posterior cranial fossa

Answer 10

Anterior there is the Petrous portion of the temporal bone, floor is made up of the mastoid process of the temporal bone

Question 11

How many cranial nerves are there?

Answer 11

12 pairs

Question 12

What is CN I

Answer 12

Olfactory

Question 13

What is CN II

Answer 13

Optic

Question 14

What is CN III

Answer 14

Oculomotor

Question 15

What is CN IV

Answer 15

Trochlear

Question 16

What is CN V

Answer 16

Trigeminal

Question 17

What is CN VI

Answer 17

Abducent

Question 18

What is CN VII

Answer 18

Facial

Question 19

What is CN VIII

Answer 19

Vestibulocochlear

Question 20

What is CN IX

Answer 20

Glossopharyngeal

Question 21

What is CN X

Answer 21

Vagus

Question 22

What is CN XI

Answer 22

Accessory

Question 23

What is CN XII

Answer 23

Hypoglossal

Question 24

What cranial nerves are sensory?

Answer 24

1, 2, 8

Question 25

What cranial nerves are motor?

Answer 25

3, 4, 6, 11, 12

Question 26

What cranial nerves have mixed functions?

Answer 26

5, 7, 9, 10

Question 27

Describe the Olfactory Nerve

Answer 27

CN 1, sense of smell, exits the skull through the cribiform plate

Question 28

Describe the Optic nerve

Answer 28

CN 2, vision, exits the skull through the optic canal

Question 29

What nerves control the muscles of the eye and how many muscles are there?

Answer 29

CN 3, 4 and 6- 6 muscles, these nerves exit the skull through the superior orbital fissure

Question 30

Describe the Trigeminal nerve

Answer 30

Somatic sensory to the face and motor for muscles of mastication. There are 3 branches for sensory each leaving the skull in a different place- V1- Superior orbital fissure, V2- Foramen rotundum, V3- Foramen ovale

Question 31

Describe the Facial nerve

Answer 31

CN 7, arises from the brain stem, 5 terminal branches (Temporal, Zygomatic, Buccal, Cervical and Marginal mandibular), Motor- muscles of facial expression, Visceral sensory to anterior 2/3 of tongue

Question 32

Describe the Vestibulocochlear nerve

Answer 32

CN 8, hearing and balance, exits the skull at the internal acoustic meatus

Question 33

Describe the Glossopharnygeal nerve

Answer 33

CN 9, sensory from tongue post 1/3 ( temp., fine touch and pain, taste), exits skull at Jugular foramen

Question 34

Describe the Vagus nerve

Answer 34

CN 10, the autonomic nerve, visceral motor to mostly autonomic, somatic sensory to pharynx and larynx and so much more

Question 35

Describe Spinal accessory nerve

Answer 35

CN 11, provides motor input to sternomastoid and upper part of trapezius, exits skull through jugular foramen, main job is to shrug shoulder and turn head

Question 36

Describe the Hypoglossal nerve

Answer 36

CN 12, motor innervation to muscles of the tongue except palatoglossus (CN 10), exits the skull through hypoglosal foramen, controls movement of tongue