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Cranium Anatomy 2
Cranium Anatomy part 2 (RAD 125)
| Question | Answer |
|---|---|
| Situated at posteroinferior part of cranium Forms posterior half of cranial base and greater portion of posterior cranial fossa | Occipital Bone |
| The Occipital Bone has | 6 Articulations |
| Both The Parietal and Temporal Bone have | 5 Articulations |
| The Frontal Bone has | 12 Articulations |
| 4 parts of the Occipital Bone | Squama |
| 4 parts of the Occipital Bone | Basilar Portion |
| 4 parts of the Occipital Bone | Two Occipital Condyles |
| 4 main parts of the Temporal Bone | Squamous Portion |
| 4 main parts of the Temporal Bone | Mastoid Portion Petrous Portion |
| 4 main parts of the Temporal Bone | Tympanic Portion (EAM) |
| Squamous portion = | thin, upper portion of temporal bone that forms part of side wall of cranium |
| Mandibular fossa = | receives condyle of mandible to form temporomandibular joint (TMJ) |
| Zygomatic process = | prominent arched process that projects anteriorly to articulate with zygoma and complete the zygomatic arch |
| Articular tubercle = | located on posterior inferior border of zygomatic process; mandibular condyle moves over it when the jaw opens |
| Mastoid Portion= | Forms the inferior posterior part of the temporal bone Usually contains air cells, which vary greatly in size and number |
| Conical process projecting from mastoid portion | Mastoid tip (process) |
| Tympanic Portion= | Small, curved plate located below the zygomatic process Forms the walls of the external acoustic meatus, which fuses internally with the petrous part |
| Slender, pointed bone projecting from inferior surface that serves as attachments for ligaments | Styloid Process |
| What is the thickest and densest portion of cranium? | Petrous Pyramids/Portion |
| Petrous Portion= | Projects medially between sphenoid and occipital bones Contains the organs/bones of hearing and balance |
| The Superior surface of the Petrous Portion is called the | Petrous Ridge |
| The ________ is located between the orbits in the anterior cranial fossa | Ethmoid Bone |
| The Ethmoid Bone forms part of the | Nasal Cavity Orbital Walls Bony Nasal Septum |
| Horizontal Portion of the Ethmoid Bone | Cribriform plate Crista galli |
| Vertical Portion of the Ethmoid Bone | Perpendicular Plate |
| 2 Labyrinths of the Ethmoid Bone | Superior and Middle Nasal Conchae Orbital Plates |
| Conical projection at anterior midline of cribriform plate | Crista Galli |
| Contains numerous foramina for transmission of olfactory nerves | Cribriform Plate |
| The Perpendicular Plate forms? | Superior portion of bony nasal septum |
| Ethmoid Labyrinths have | Two thin, scroll-shaped projections (conchae) Superior Nasal Concha Middle Nasal Concha |
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