WEEK 2 Flashcards
What is the skull?
Skull is the bony framework that gives the head its characteristic shape and protects the soft and vital tissues of the head, particularly the brain
How many bones is the skull composed of?
22 bones
8 in the cranium & 14 in the face
What are the eight bones of the Cranium?
- Frontal
- Occipital
- Sphenoid
- Ethmoid
- Two parietal bones
- Two temporal bones
What are the 14 bones in the face?
- Mandible (1)
- Maxillae (2)
- Zygomatic bones (2)
- Lacrimal bones (2)
- Nasal bones (2)
- Inferior Conchae (2)
- Palatine bones (2)
- Vomer (1)
How can the skull be examined?
- CT scan (the best)
- X-ray
- MRI
What do the bones that contribute to the skeletal framework of the nasal cavities include?
- Unpaired: Ethmoid, Sphenoid, Frontal bone and vomer
- Paired: Nasal, Maxillary, Palatine, Lacrimal bones and Inferior conchae
What are the properties of the Maxillary sinus?
- Present at birth
- First radiological evidence 4-5 months after birth
- Reaches adult size by 15 years
What are the properties of the Ethmoid sinus?
- Present at birth
- First radiological evidence at 1 year
- Reaches adult size by 12 years
What are the properties of the Sphenoid sinus?
- Not present at birth
- First radiological evidence at 4 years
- Reaches adult size by 15 years
What are the properties of the Frontal sinus?
- Not present at birth
- First radiological evidence at 6 years
- The size increases until teen years
The sphenoid sinus develops in the body of the sphenoid sinus and drains via a _______________ into spheno ethmoid recess
Sinus ostium
What is sinus pneumatisation?
Sinus pneumatisation is a continuous physiological process that causes the paranasal sinuses to increase in volume
What is the degree of pneumatisation in the sphenoid sinus?
The degree of pneumatisation is variable and may extend into greater and lesser wing of sphenoid and pterygoid plates
What are the important structures related to the sphenoid sinus?
Vivian canal
Optic nerve
Foramen rotundum
