Flashcards in Lecture 26 RH Deck (71)
How many bones does the skull have?
What are joints between skull bones called? Are they mobile?
Sutures, they are immobile
What are the 3 major parts of the skull?
Cranium: covers the brain.
What is contained within the cranial cavity?
Cranial cavity contains brain, meninges, cranial nerves, arteries, veins, venous sinuses.
What is the roof of the cranium called?
Roof of cranium is called the cranial vault.
What is the floor of the cranium called?
Floor of cranium is called the cranial base.
What are the names of the cranial bones?
Bones are named after the lobes of the brain.
What is the maxilla bone? How many are there?
Maxilla are the upper jaw bones. There are 2 of them.
What are the zygomatic bones? How many does the skull contain?
zygomatic bones are on the lateral aspects of the eye socket they are colloquially known as cheek bones.
What are the facial bones called?
Nasal bones x2
Lacrimal bones x2
Palatine bones x2
Inferior Conchae x2
What is the mandible?
Mandible is the lower jaw bone.
Where are lacrimal bones found? How many of them are there?
Lacrimal bones are found within the orbit. 2 of these bones exist
What suture is found between the parietal bones?
The 2 parietal bones are joined by the sagittal suture.
What suture combines the 2 parietal bones with the frontal bone?
2 parietal bones joing with frontal bone via coronal suture.
How are the parietal bones joined to the occipital bone?
2 parietal bones are joined with occipital bone by the lambdoidal suture
What are the levels of the floor of the cranium? How are these levels arranged?
Anterior cranial fossa
Middle cranial fossa
Posterior cranial fossa
These levels are arranged like a staircase.
What are the bones that make up the anterior cranial fossa?
Floor of the anterior cranal fossa contains the orbital plates of frontal bone and cribiform plate of the ethmoid bone.
posterior part of the anterior cranial fossa is dominated by the sphenoid bone.
Where does the anterior cranial fossa end?
Sphenoid bone looks like a butterfly with wings. Anterior cranal fossa ends at the lesser wing.
What are the plates that cover the orbit of the eye called?
Plates that covers the orbit of the eyes are the orbital plates.
What is the function of the holes in the ethmoid bone?
ethmoid contains holes through which nerves of cranial cavity pass
What are the bones that make up the middle cranial fossa?
Anteriorly: Lesser wing of the sphenoid
Posteriorly: Petrous portion of the temporal bone
Laterally: Temporal bone, greater wing of the sphenoid bone, parietal bone
Why is there a gap between the greater and lesser wings of the sphenoid bone?
gap between lesser and greater wing of the sphenoid is important for passage of blood vessels and nerves.
What is the function of the middle part of the sphenoid bone?
Middle part of the sphenoid is the location of important brain structures (eg pituitary gland) it is also called "the turkish saddle".
What are the bones that make up the posterior cranial fossa?
Anteriorly: petrous portion of the temporal bone
Floor: Basilar, condylar, and squamous portions of the occipital bone, mastoid process of the temporal bone.
Posteriorly the occipital bone
What are the structures contained within the posterior cranial fossa?
How many cranial nerves are there?
12 paired nerves and they are all connected to the brain.
What is the general function of the cranial nerves?
Supply somatic and visceral motor and sensory information to the head.
What is the function of cranial nerves IX and X?
visceral sensory and motor innervation to the neck, chest and abdomen.
How are cranial nerves arranged and named?
Cranial nerves are arranged in pairs and are named from 1 to 12 according to their target organ. 1 is rostral and 12 is very caudal.