Session 2 Flashcards
What is the coronal suture?
The suture that lies between the frontal and parietal bone
What is the sagital suture?
The suture that lies in the middle of the parietal bones
What is the lambdoid suture?
The suture that lies between the occipital and parietal bone
What is the neurocranium?
- 8 bones that encase and protect the brain
- Made up of the calvaria, cranial floor and the cranial cavity
How does the skull cap (calvaria) develop?
-Calvaria begins as membrane and undergo intramembranous ossification
How does the cranial floor develop?
-Begins as cartilage and undergoes endochondrial ossificaton
What is the viscerocranium?
- 14 bones that make up the facial skeleton and the jaw
- Surrounds the oral cavity, pharynx and upper respiratory passages
How does the viscerocranium develop?
Begin as membrane or cartilage and ossify
How do structures within the neurocranium communicate with other head and neck structures?
- Cranial floor needs holes that permit cranial nerves connect the brain and brainstem to the structures of the face and neck they innervate
- Blood vessels also need to pass between the inside/outside the neurocranium
What is the appearance of the cranial floor?
- Anterior, middle and posterior cranial fosse.
- Grooved by location of dural venous sinuses
- Each fossae has series of foramina; fissures and canals to allow communication
What is the trilaminar arrangement of the calvaria?
- Outer table of compact bone
- Diploeic cavity of spongy bone
- Inner table of compact bone
What is the advance of the trilaminar arrangement?
-Allows for protective strength without adding significant weight
Why are the edges of the bones forming the suture lines serrated ?
-To prevent slippage and movement
When does growth at sutures stop?
Around puberty
What happens to sutures post puberty?
They are obliterated from the inside to the outside
What covers the outer table of bone?
The periosteum
