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Ch. 11 skull

Procedures 2

QuestionAnswer
the skull has ___ cranial bones and ____ facial bones. 8 cranial, 14 facial
The skullcap is AKA? And consists of what 4 bones? Calvarium (skullcap) Frontal, RT and LT parietal, and Occipital
The floor of the cranium consists of what 4 bones? RT and LT temporal, sphenoid, ethmoid
What part of the frontal bone forms the forehead? (2 names) Squamous or vertical portion
What part of the frontal bone forms the superior part of the orbit? Orbital or horizontal portion
Smooth raised prominence between the eyebrows? Glabella
What is the slight depression above each eyebrow? Supraorbital groove (SOG)
The supraorbital groove is an important landmark because it corresponds to.... the floor of the anterior fossa of the cranial vault, same level of the orbital plate or at the highest level of the facial bone mass
superior rim of each orbit is called? supraorbital margin (SOM)
what and where is the supraorbital notch? (foramen) hole within the SOM, slightly medial to its midpoint, nerve and artery pass through.
Where is the frontal tuberosity? on each side of the squamous portion of frontal bone, above the SOG. This prominence is larger and more round.
What is below the orbital plates? and what is above? Below= facial bones. Above= anterior part of the floor of the brain case
Each orbital plate is separated from the other by the ______. ethmoidal notch
The lateral walls of the cranium and part of the roof are formed by the two ______ parietal bones
The widest portion of the skull is located between the what? parietal tubercles of the two parietal bones.
Parietal bones: the temporal bones are _____, and the greater wings of the sphenoid are ____ and _____. temporal are inferior, wings are inferior and anterior
frontal bone articulates with what four cranial bones? RT and LT parietal, sphenoid, ethmoid. (also articulates with 8 facial bones..)
Each parietal bone articulates with what 5 cranial bones? frontal, occipital, temporal, sphenoid, and opposite parietal.
where is the squamous portion of the occipital bone? Superior to the external occipital protuberance (inion).
What is the external occipital protuberance? prominent bump at the inferoposterior portion of the skull.
Large opening at the base of the occipital? foramen magnum
These processes of the occipital bone are on each side of the foramen magnum condylar portions (occipital condyles)
Occipital bone articulates with what 6 bones? two parietals, two temporals, sphenoid, and atlas (C1)
What bones house the organs of hearing and balance? temporal
As seen from a lateral view, the left temporal bone is situated between __________ anteriorly and the ______ posteriorly. greater wing of the sphenoid and occipital
Extending anteriorly from the squamous portion of the temporal bone is an arch of bone termed ? zygomatic process
What two processes meet to form the zygomatic arch? the zygomatic process of the temporal bone meets the temporal process of the zygomatic bone to form the arch.
Inferior to the zygomatic process and anterior ro the EAM is the _________, into which the mandible fits to form the _____ joint. temporomandibular (TM) fossa, forming the tempomandibular joint (TMJ)
(temporal) Inferior to the mandible and anterior to the EAM is projection called the styloid process
Each temporal bone is divided into 3 primary parts: squamous, mastoid, and petrous
thin upper portion of temporal bone? squamous
What portion of the skull is most vulnerable to fracture? squamous portion of temporal
2nd portion of temporal bones? mastoid
3rd portion of the temporal bones is? (4 names) petrous portion, petrous pyramid, pars petrosa, petromastoid portion.
Why is the petreous portion of the temporal bones sometimes called the petromastoid portion? because internally it includes the mastoid portion
What portion of the temporal bones houses the organs of hearing and equilibrium? petrous portion
The upper border of the petrous pyramids is commonly called what? Petrous ridge or apex
________ portion of the _____ bone is the thickest and densest bone in the cranium. The pyramid-shaped portion of the temporal bone
The petrous pyramids project anteriorly and toward the midline from the area of the ____. EAM.
The petrous ridge correspondes to what important external landmark? TEA (top of ear attachment)
Near the center of the petrous pyramid, just superior to the jugular foramen is an opening called? Internal acoustic meatus. (transmits nerves of hearing and equilibrium)
Each temporal bone articulates with what 3 cranial bones? Parietal, occipital, sphenoid. (also 2 facial)
What bones serves as an anchor for all 8 cranial bones? Sphenoid
The body of the sphenoid has a central depression termed what? sella turcica
The sella turcica partially surrounds and protects what? a glad in the body, the hypophysis cerebri, or pituitary gland.
Posterior to the sella turcica is the back of the saddle, the ______. dorsum sallae
The
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