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Skull Bones

RA & Anatomy

The cranium serves to... Enclose the brain
The facial bones serve to... Form the framework of the face
______ ______ form the anterior aspect of the skull Facial Bones
The cranium is divided into the... Cranial Vault & the Base
Temporal Bones, Parietal Bones, Frontal Bone, Occipital Bone, Sphenoid Bone, Ethmoid Bone Cranial Bones
Forms the forehead & roofs of the orbits, Most anterior & most superior bone of cranium, 2 surface planes Frontal Bone
Superior margin of each orbit, bony ridge behind the eyebrow Supraorbital Margin
Lie deep to our eyebrows, comma-like bumps/eminences Supercilliary Arches
Smooth elevation between the supercilliary arches in the midline, above the nose Glabella
2 Rounded prominences on the frontal bone where the frontal bone changes direction between the vertical plane and the horizontal plane Frontal Eminences
Contributes to the anterior cranial fossa Frontal Bone
Superior to the temporal & occipital bones, posterior to the frontal bone, seperated by the midsagittal suture, 2 surface planes Parietal Bones
4 Sutures of the Cranium Coronal, Squamosal, Lambdoidal, Sagittal
Located where the parietal bones meet the frontal bone Coronal Suture
Occurs where the parietal bones meet the temporal bones inferiorly Squamosal Suture
Occurs where the right & left parietal bones meet superiorly Midsagittal Suture
Occurs where the parietal bones meet the occipital bone posteriorly Lambdoidal Suture
Most posterior & inferior of the cranial bones, forms the posterior cranial fossa Occipital Bone
Located medially on the inferior aspect of the skull, where brain stem connects to the brain Foramen Magnum
Large eminences on either side of the foramen magnum, articulate with the first vertebra (C1) Occipital Condyles
Small eminence medially & posterior to the foramen magnum External Occipital Protuberance
Lie inferior to the parietal bones & anterior to the occipital bone, form the inferolateral portion of skull Temporal Bones
4 Regions of the Temporal Bones Squamosal, Tympanic, Petrous, Mastoid
Long, thin, narrow, arch/bar-like projection, projects anteriorly to meet the zygomatic bones, part of the squamosal region of temporal bones Zygomatic Process/Arch
Located on the inferior surface of the zygomatic process, depression/socket anterior to the auditory meatus, only movable joint in skull Mandibular Fossa
Project inferiorly from the tympanic region Styloid Process
Most posterior & inferior part of the temporal bone and part of the mastoid region Mastoid Process
3 Small Bones(Ossicles) of the ear Malleus, Incus, Stapes
Spans the width of the cranial floor and resembles a bat, consists of greater wings, lesser wings, and the pterygoid process Sphenoid Bone
Saddle shaped prominence on the superior surface of the body of the sphenoid bone; seat of the saddle is... Sella Turcica; Hypophyseal Fossa
Lies between the nasal & sphenoid bones, forms most of the medial bony region between the nasal cavity & orbits Ethmoid Bone
Extends medially from the lateral masses and protrudes into the nasal cavity Superior & Middle Nasal Concha
superior surface of the ethmoid bone, contributes to the roof of the nasal cavity & the floor of the anterior cranial fossa Cribriform Plate
Superior projection in the midline between the two cribriform plates Crista Galli
Projects inferiorly in the median plane & forms the superior part of the nasal septum Perpendicular Plate
Unpaired facial bones Mandible, Vomer
Paired facial bones Maxillary, Zygomatics, Nasals, Lacrimals, Palatines, Inferior Nasal Concha
Most anterior and inferior bone; largest, strongest facial bone composed of two main parts, the ramus & body Mandible
Straight, vertical, posterior part of the mandible Ramus (Rami)
Curved, horizontal, anterior part of the mandible Body
Angle formed by the junction of the inferior edge of the body and the posterior edge of the ramus Madibular Angle
Superior margin of the mandible, inferior margin of the maxillary bones Alveolar Process
Projection of bone located on the midline just above the base of the chin, makes the chin more prominent Mental Eminence/Protuberance
Inferior to the nasal cavity and lateral to the nasal cavity; articulate with all the other facial bones except the mandible Maxillary Bones
Frontal, Ethmoid, Sphenoid, and Maxillary Sinuses make up the.... Paranasal Sinuses
Project medially from the alveolar process to form the anterior region of the hard palate; border between the nasal cavity and the oral cavity Palatine Process
Finger-like projections that extend superiorly and anteriorly from the maxillary bones Frontal Process
Inferior and lateral to the orbital cavities, form the lateral wall of the orbits Zygomatic Bones
Inferior and obliquely anterior to the glabella, form the bridge of the nose and articulate at the midline Nasal Bones
Located in the medial orbital walls Lacrimal Bones
Indent under the glabella that comes back out and down to the nasal bones Root of the Nose
Bones that complete the posterior part of the hard palate Palatine Bones
Forms the inferior part of the nasal septum Vomer
Thin, curved bones that project medially to form the lateral walls of the nasal cavity Inferior Nasal Concha
Paired cranial bones Temporal & Parietal Bones
Unpaired cranial bones Frontal, Occipital, Sphenoid, & Ethmoid Bone
Bony ridge which extends bilaterally from the external occipital protuberance Superior Nuchal Crest
Thinnest bone of the skull that is the anterior and superior part of the temporal bones; receeds medially to form the temporal cavity Squama
Vertical ridge on each side of the vertical surface of the frontal bone where the bone changes direction Lines of the Temple
Slightly inferior and lateral to the outer corner of the eye where the zygomatic bones change direction; the measure between is the widest part of the anterior plane of the face Prominence of the Cheek
Small sharp spur of bone projecting where the two maxillary bones meet at the midline directly inferior to the nasal cavity Nasal Spine
Depression curving backward between the mental eminence and the lower incisors Incisive Fossa
Created by: sbarton



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