Ch. 10 Bones of the Skull Flashcards
Functions of the skull
PCOM! Protection cavity for the brain Cavities to house sensory organs Opening for air and food passage Mastication
How many bones are in the skull?
22, both paired and unpaired. Grouped into cranial and facial bones.
Immovable joints
sutures
Which is the only bone joined by a synovial joint?
Mandible
The 8 bones that encase and protect the brain.
Cranial bones
How many cranial bones are there?
8
Superior portion of the cranium is also referred to as ___
calvaria
A flat bone at the posterior inferior aspect of the cranium
Occipital
Large foramen at the base of the skull near the anterior aspect of the occipital bone through which the spinal cord enters the cranium.
Foramen magnum
Structures on the occipital bone
External occipital protuberance (occiput) Superior nuchal line Inferior nuchal line Occipital condyles Basilar part
NOOB (nuchal, occiput, occipital condyles, basilar part)
Large, prominent eminence on the posterior midline of the occipital bone.
External occipital protuberance (occiput)
Curved ridge extending laterally from the occiput
Superior nuchal line
Curved ridge that parallels the superior nuchal line and extends laterally from the occiput
Inferior nuchal line
Prominent oval projections at the anterolateral aspects of the foramen magnum that articulate with the first cervical vertebrae.
Occipital condyles
Part of the occipital bone that lies anterior to the foramen magnum and articulates with the sphenoid bone. Its superior surface is called the Clivus.
Basilar part
Superior surface of the basilar part
Clivus
Bones forming a large part of the walls of the skull
parietal
Bones located at the lateral and superior aspect of the cranium
parietal
Bone of the forehead
frontal
located at the anterior and superior aspect of the cranium anterior to the parietal bones. forms the roof of the orbits.
frontal
Structures on the frontal bone
Suparorbital margin Supraorbital notch or foramen Squamos part Frontal sinus FSSS
Bones lying at the lateral aspect of the cranium, inferior to the parietal bones
temporal
Weakest cranial bone
temporal
Part of the frontal bone that forms the superior border of the orbit.
Supraorbital margin
Small notch or hole respectively, is found at the medial third of the supraorbital margin
Supraorbital notch or foramen
Forehead part of the frontal bone
squamous part
Space that lies between the orbital and the squamous parts of the frontal bone
frontal sinus
Structures of the temporal bone
Squamous part Zygomatic process Zygomatic arch Mandibular process Mastoid process External auditory meatus Styloid process Petrous portion of temporal bone SZZMMESP
Thin, scalelike, superior expansion of the temporal bone forming the part of the lateral cranial wall
Squamous part of the temporal bone
Long, thin bone that extends anteriorly from the anteroinferior aspect of the squamous part of the temporal bone to articulate with the zygomatic bone.
Zygomatic process
Arch formed by zygomatic bone and zygomatic process
Zygomatic arch
Oval depression for articulation with the mandible, specifically the condyloid process of the mandible.
Mandibular Fossa
the breast-shaped projection extending inferiorly from he posterior aspect of the mastoid part
mastoid process
Large canal posterior to the mandibular fossa that opens into the ear
external auditory meatus
another name for external auditory meatus
external acoustic meatus
Long, slender, pencil-like process antermedial to the external auditory meatus that extends inferiorly
Styloid process
Hard, wedge-shaped portion between the occipital and sphenoid bones that houses the middle and inner ear
Petrous portion of the temporal bone
Why is the sphenoid bone called the sphenoid?
Wedged between the cranial and facial bones
Bone that forms the base of the cranium anterior to the temporal and occipital bones; also forms the floor and lateral walls of the orbit
Sphenoid
Structures on the sphenoid bone
Body Sella turcica Greater wings Lesser wings Pterygoid processs
Brody seduced Genny into Letting him Party
Cubical portion of the sphenoid in the midline of the base of the cranium anterior to the occipital bone. Hollowed out to form two sphenoid air sinuses
Body of the sphenoid
Deep depression on the superior aspect of the body of the sphenoid.
Sella turcica
Posterior border of sella turcica is formed by the _____
dorsal sellae
Indentation in the sella turcica housing the pituitary gland
Hypophyseal fossa
Two broad lateral extensions from the body of the sphenoid. Contains openings including the foramen rotunda, oval, and spinousum.
Greater wing
Where does the middle meningeal artery pass?
Foramen spinosum
Which foramens are in the greater wing of the spenoid
Foramen rotunda
Ovale
Spinosum
Thin triangular projections that extend into the posterior wall of the orbit and form the anterior aspect of the superior surface of the body
Lesser wing
Extends inferiorly from the junction of the greater wing of the body.
Pterygoid process
Separates the medial and lateral pterygoid plate
pterygoid fossa
Lies laterally to the choanae
medial pterygoid
Sievelike bone at anterior base of the cranium between two orbits.
Ethmoid
Structure sof ethmoid
Cribiform plate Perpendicular plate Lateral mass Middle nasal concha Superior nasal concha
Forms the anterior aspect of the cranium and has numerous foramina for the passage of nerve fibers.
Cribirom plate
Cribiform plate surrounds the base of the ____
crista galli
thin plate perpendicular to and extends inferiorly from the crbiform plate to form the superior aspect of the nasal septum
Perpendicular plate
Consists of lateral aspects of the ethmoid made of large air cells forming part of the orbit.
Lateral mass
Free, convoluted inferior margin of the medial plate of the lateral mass
middle nasal concha
part of the lateral mass superior to the middle nasal concha. Difficult to see from an anterior view of skull.
Superior nasal concha
How many facial bones are there?
14
Bone forming the upper jaw
maxilla
Structures of the maxilla
Body
Alveolar process
Palatine process
Infraorbital foramen
BAPI!
Pyramidal in shape, contains a large air sinus
Body (contains maxillary sinus)
The arch on the inferior border of the maxilla; it bears cavities into which the teeth of the upper jaw are set.
Alveolar process
Found on the anterior surface of the body inferior to the infraorbital margin
Infraorbital foramen
Lower jaw bone
Mandible
Hose-shoe shaped bone consisting of a horizontal body and paired rami which are perpendicular to the body
mandible
Structures of the mandible
Alveolar process Mental foramen Angle Condyloid process Neck Coronoid process Mandibular foramen
Arch on the superior border of the body into which the teeth of the lower jaw are set
Alveolar process
Foramen on the lateral aspect of the body, inferior to the second premolar tooth
mental foramen
Formed by the intersection of the ramus and the body of the mandible.
Angle
Sits on the superior border of the ramus and articulates with the mandibular fossa of the temporal bone
condyloid process
Constricted area of the ramus inferior to the head of the mandible
Neck of the mandible
Found on the superior border of the ramus
Coronoid process
Large central foramen on the medial surface of the ramus, holds the inferior alveolar nerve
Mandibular foramen
Bones helping form the zygomatic arch that connects the zygomatic and temporal bones
Zygomatic Bones
Irregular bones that form part of the lateral wall and floor of the orbit
Zygomatic bones
Bones helping form the nose
nasal bones
Two small bones form the anterior and superior aspect of the nose, inferior to the frontal bone
nasal bones
Thin, small irregular bones form the anterior portion of the medial wall of the orbit
lacrimal
Small, curved, irregular shell-like bone, that extends horizontally along the lateral nasal wall superior to the hard palate
Inferior nasal conchae (turbinate)
Irregular bones form the posterior portion of the hard palate posterior to the maxilla
Palatine
Vertical irregular bone in the median plane extending between the hard palate inferiorly and the sphenoid and ethmoid superiorly.
Vomer