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The axial skeleton
skull
47
Anatomy
Undergraduate 2
10/24/2006

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Term
The cranium is divided into two major areas, what are these areas called?
Definition
1. The craniul vault- calvaria

2. The cranial floor- base
Term
The skull is composed of two sets of bones. These are called?
Definition
1. The cranium

2. the facial bones
Term
The anterior, middle, and posterior cranial fossae are all three distinct cavities of what?
Definition
The cranial floor or base.
Term
Which bone covers the anterior portion of the cranium, forms the forehead, superior part of the orbit, and floor of anterior cranial fossa?
Definition
The Frontal Bone
Term
An opening above each orbit allowing blood vessels and nerves to pass.
Definition
Supraorbital foramen
Term
The smooth area between the eyes?
Definition
Glabella
Term
Posterolateral to the frontal bone, forming sides of cranium.
Definition
Parietal Bone
Term
Midline articulation point of the two parietal bones.
Definition
Sagittal suture
Term
Point of articulation of parietals with frontal bone.
Definition
Coronal suture
Term
Inferior to the parietal bones on lateral skull.
Definition
Temporal bone
Term
The temporal bone can be divided into four major parts. List these parts.
Definition
1. squamous region
2. tympanic region
3. mastoid region
4. petrous region
Term
Point of articulation of the temporal bone with the parietal bone.
Definition
Squamous suture
Term
A bridgelike projection joining the zygomatic bone anteriorly. Together these 2 bones form the zygomatic arch.
Definition
Zygomatic process
Term
Rounded depression on the inferior surface of the zygomatic process, forms the socket for the mandibular condyle, the point where the mandible (lower jaw) joins the cranium.
Definition
Mandibular fossa
Term
Canal leading ot eardrum and middle ear.
Definition
External auditory meatus
Term
Needlelike projection inferior to external auditory meatus; attachment point for muscles and ligaments of the neck. This process os often broken off demonstrations.
Definition
Styloid process
Term
Rough projection inferior and posterior to external auditory meatus, attatchment site for muscles.
Definition
Mastoid process
Term
Tiny opening between the mastoid and styloid processes through which cranial nerve 7 leaves the cranium.
Definition
Stylomastoid foramen
Term
Tiny opening between the mastoid and styloid processes through which cranial nerve 7 leaves the cranium.
Definition
Stylomastoid foramen
Term
Opening medial to the styloid process through which the internal jugular vein and cranial nerves IX, X, and XIpass.
Definition
Jugular foramen
Term
Opening medial to the styloid process through which the internal carotid artery passes into the cranial cavity.
Definition
Carotid canal
Term
Opening on posterior aspect of temporal bone allowing passage of cranial nerves 7 and 8.
Definition
Internal acoustic meatus
Term
A jagged opening between the petrous temporal bone and the sphenoid providing passage for a number of small nerves and for hte internal carotid artery to enter the middle cranial fossa.
Definition
Foramen Lacerum
Term
Most posterior bone of cranium, forms floor and back wall. Joins sphenoid bone anteriorly via its narrow basioccipital region.
Definition
Occipital Bone
Term
Site of articulation of occipital bone and parietal bone.
Definition
Lamboid suture
Term
Large opening in base of occipital, which allows the spinal cord to join with the brain.
Definition
Foramen magnum
Term
Rounded projections lateral to the foramen magnum that articulate with the first cervical vertebra (atlas).
Definition
Occiptal condyles
Term
Opening medial and superior to the occipital condyle through which the hypoglossal nerve (cranial nerve XII) passes.
Definition
Hypoglossal canal
Term
Portions of the sphenoid seen exteriorly anterior to the temporal and forming a part of the eye orbits.
Definition
Greater wings of the shenoid bone
Term
Jagged openings in orbits providing passage for cranial nerves 3,4,5,6, to enter the orbit where they serve the eye.
Definition
Superior orbital fissure
Term
A saddle-shaped region in the sphenoid midline which nearly encloses the pituitary gland.
Definition
Sella Turcica (Turks sadle)
Term
The pituitary gland sits in the _______portion of the sella turcica.
Definition
Hypophyseal fossa
Term
Bat-shaped portions of the sphenoid anterior to the sella turcica.
Definition
Lesser wings
Term
Openings in the bases of the lesser wings through which the optic nerves enter the orbits to serve the eyes.
Definition
Optic canals
Term
Opening lateral to the sella turcica providing passage for a branch of the fifth cranial nerve.
Definition
Foramen rotundum
Term
Opening posterior to the sella turcica that allows passage of a branch of the fifth cranial nerve.
Definition
Foramen ovale
Term
Opening posterior to the sella turcica that allows passage of a branch of the fifth cranial nerve.
Definition
Foramen ovale
Term
Opening posterior to the sella turcica that allows passage of a branch of the fifth cranial nerve.
Definition
Foramen ovale
Term
Irregularly shaped bone anterior to the sphenoid. Forms the roof of the nasal cavity, upper nasal septum, and part of the medial orbit walls.
Definition
Ethmoid bone
Term
Vertical projection providing a point of attachment for the dura mater, helping ot secure the brain within the skull.
Definition
Cristi galli
Term
Bony paltes lateral to the crista galli through which olfactory fibers pass to the brain from the nasal mucosa.
Definition
Cribiform plates
Term
Bony paltes lateral to the crista galli through which olfactory fibers pass to the brain from the nasal mucosa.
Definition
Cribiform plates
Term
Bony paltes lateral to the crista galli through which olfactory fibers pass to the brain from the nasal mucosa.
Definition
Cribiform plates
Term
Inferior projection of the ethmoid that forms the superior part of the nasal septum.
Definition
Perpendicular plate
Term
Thin, delicatly coiled p[lates of bone extending medially from the lateral masses of ethmoid into the nasal cavity.
Definition
Superior and middle conche
Term
Thin, delicatly coiled p[lates of bone extending medially from the lateral masses of ethmoid into the nasal cavity.
Definition
Superior and middle conche
Term
Thin, delicatly coiled p[lates of bone extending medially from the lateral masses of ethmoid into the nasal cavity.
Definition
Superior and middle conche
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