Bones Flashcards
The human skull is made up of how many bones?
22 bones
How many bones make up the cranium?
8
The frontal bone contains five structures. What are they?
Frontal eminences, superciliary arches, glabella, supra-orbital margins, frontal sinuses
What are the two rounded prominences located at the upper part of the forehead?
Frontal Eminences
These extend laterally from the glabella…
What is superciliary arches.
This is a small, smooth elevation that lies between the superciliary arches
What is the glabella
These can be found on the upper room of the eye orbit, or eyesocket just below the superciliary arches
What is supra-orbital margins.
A small cluster of isolated bones found in the joints of the cranial bone are called…
Sutures
The sinuses are located medially, and behind the superciliary arches
What is frontal sinuses
An air filled cavity within a bone, lined with mucous membrane, and connected to/communicate with the nasal cavity.
What is a sinus
This suture can be found between the two parietal bones…
What is the sagittal suture
These two cranial bones form the greater portion of the sides and roof of the cranial cavity
What is the parietal bones
This suture is found between the temporal bones and the parietal bones…
What is the squamosal suture
These cranial bones are located below the parietal bone at the sides of the skull in floor of the cranium
What are the temporal bones
Temporal bones contain eight structures what are the eight structures?
1.Squamous portion 2. zygomatic process, 3.external auditory Meatus 4. mastoid process 5. styloid process 6. mandibular fossa, 7. petrous portion, 8. carotid canal, a.k.a. carotid, Foreman
This is the thin flat vertical portion of the cranium form the interior and superior part of the temple in front of the ears
What is the squamous portion
This process of projects from the inferior surface of the squama bone.
What is the zygomatic process
The zygomatic process articulates with this process of the zygomatic bone
What is the temporal process
The temporal process of the zygomatic bone helps form these arches…
What is the zygomatic arches.
What part of the temporal bone articulates with the zygomatic bone?
The zygomatic process of the temporal bone articulates with the temporal process of the zygomatic bone.
The external auditory meatus is also known as what?
What is the ear canal
This canal is located below the squama and in front of the mastoid process and inferior to the squama & anterior to the mastoid process.
What is the ear canal aka the external auditory meatus.
This part runs from the outer ear to the middle ear, and allows the sound to enter the ear.
What is the external auditory meet us a.k.a. ear canal.
This process is located behind, and below the external auditory meatus posteriorly and superiorly to the external auditory meatus…
What is the mastoid process (the bump behind the ear)
This process is located inferior to the temporal bone and serves as a point of attachment where the muscles and ligaments of the tongue neck and higher on, is also connected to the scm muscle.
What is the styloid process…
This fossa is a depression, located in the back (posterior) and bottom (inferior) surface of the zygomatic process and articulates with the condylar process of the mandible know as the temporal mandibular articulation (TMJ)
What is the mandibular fossa
The Mandibular Fossa articulates with the condylar process of the mandible to form this articulation.
What is the temporomandibular articulation
This portion of the temporal bone is located in the floor of the cranial cavity between the sphenoid and occipital bones and is the hardest part of the temporal bone also containing the middle ear, internal ear, and carotid canal.
What is the petrous portion
This foreman has the right and left internal carotid arteries passing through it
What is the carotid canal a.k.a. carotid Foreman
This cranial bone is located in the back and bottom of the skull, the posterior and inferior portion of the skull
What is the occipital bone.
Is suture is found between the occipital and the parietal bones
What is a lambdoidal suture
This bone contains the foreman magnum, occipital condyles, super nuchal line and the external occipital protuberance.
What is the occipital bone
This large opening on the inferior part of the occipital bone has the medulla oblongata in the right, and left vertebral arteries passing through it (merges from the basilar artery and branches into the subclavian artery
What is the foramen magnum
These oval shaped processes are located on both sides of the foreman, magnum and articulate with the first cervical vertebrae (C1)
What is the occipital condyles
This prominent midline projection on the back posterior surface above superior to the foramen magnum - is also known as the EOP for short
What is the external occipital protuberance
These two bony ridges extend literally from each side of the external occipital protuberance, and serves as the origin of the occipital frontalis muscle.
What is the superior nuchal line
This bone is located in the middle part of the base of the skull, posterior to and slightly superior to the nasal cavity, and is described as bat or wing shaped
What is this sphenoid bone
This bat or wing shaped bone is a part of the floor and side walls of the eyesocket, and is also known as the “keystone of the cranial floor”
What is this sphenoid bone
This structure located within the sphenoid bone is a saddle shaped structure on the anterior surface of the sphenoid bone containing the pituitary gland
What is the Sella turcica?
This cavity in the sphenoid bone is lined with mucus membrane which drains into the nasal cavity
What is sphenoidal sinus
This light spongy bone is in the midline of the front of the floor of the cranium between (medial to) the eye orbit and interior to the sphenoid bone and posterior to the nasal bones.
What is the ethmoid bone
This bone is a major superior supporting structure of the Nasal cavity and forms the cranial floor, the medial wall of the eye orbits, superior portion of the nasal septum and the side walls of the nasal cavities.
What is the ethmoid bone
What are the five structures of the ethmoid bone?
The cribriform plate aka horizontal, plate, the perpendicular plate, the crista galli, a superior nasal Conchae (and middle nasal conchae (2 turbinates) and the ethmoidal sinuses
This plate within the ethmoid bone forms, the anterior floor of the cranium and the roof of the nasal cavity. It contains olfactory foramina where the olfactory nerve passes.
What is the cribriform plate a.k.a. horizontal plate
This inferior portion of the cribriform plate forms the superior portion of the nasal septum
What is the perpendicular plate
This small triangular process of the Ethmoid bone project superiorly from the cribriform plate, and serves as a point of attachment for the meninges 
What is the Crista galli
