Radiographic Anatomy Skeletal System Skull Educational Objectives By the end of this lecture you...
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![Page 1: Radiographic Anatomy Skeletal System Skull Educational Objectives By the end of this lecture you should be able to: Identify the anatomical parts of.](https://reader036.fdocuments.net/reader036/viewer/2022062423/5697c02b1a28abf838cd8b25/html5/thumbnails/1.jpg)
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Radiographic Anatomy
Skeletal System
Skull
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Educational Objectives
By the end of this lecture you should be able to: Identify the anatomical parts of skull on diagrams and
radiographs. Identify the different sutures of the skull State the surface land marks of skull and explain
its importance in radiographic positioning Explain how to hang skull radiographs on the
view box
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1. Text book of radiographic positioning and related anatomy; by Kenneth L.Bontrager,6th edition. 2. Introduction to Human Anatomy and Physiology: by Eldra Pearl Solomon:W.B.Saunders Company 3. Handbook of Anatomy and physiology for Students of Medical Radiation Technology: Mallett.M:Jaspar
Websiteshttp://www6.district125.k12.il.us/science/anatomy/http://www.innerbody.com/htm/body.html http://www.e-radiography.net/
http://www.getbodysmart.com/index.htm
References
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Skull
8 Cranial bones (cranium)
+
14 Facial bones
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6
Cranial bones (8)
Skull Cap (Calvarium):
● 1 Frontal
● 2 Parietal (R,L)
● 1 Occipital
Skull Base (floor):
● 2 Temporal (R,L)
● 1 Sphenoid
● 1 Ethmoid
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Facial bones (14)
• 2 Maxillary
• 2 Zygomatic
• 2 Lacrimal
• 2 Nasal
• 2 Palatine
• 2 Inferior nasal conche
• 1 Vomer
• 1 Mandible
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Skull views
Anterior AspectLateral Aspect
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Skull views
Inferior AspectSuperior Aspect
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Frontal
Frontal ViewThe frontal bone forms part of the roof of the orbital cavities, it contains two hollow spaces (sinuses) which communicate with the nasal cavities. The frontal bones articulate with the parietal bones, sphenoid, zygomatic, lacrimal, nasal and ethmoid bones. At birth the frontal bone consists of two parts separated by the (frontal suture) but union is usually complete by the 8th year of life.
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Parietal
Frontal View
Two bones form the sides of the vault just behind the frontal bone on each side of the median plane. They articulate with each other at the sagital suture, with the frontal bone at the coronal suture, with the occipital bone at the lambdoid suture, and with the temporal bone at the squamous suture.
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Temporal
Frontal View
These two bones lie on each side of the head below the parietal bones; each one is divided into five parts: (1) Squamous part, (2) Mastoid process: can be felt behind the ear , contains large number of air sinuses which become areated only in adults.(3) Tympanic part : in front of the mastoid and below the squamous, form part of the osseous part of EAM. (4) Styloid process, (5) Petrous part of temporal bone: forms part of the base of the skull ,contains organs of hearing and equilibrium and IAM. Which transmits the facial nerve and vestibulocochlear nerve. It contains also the carotid canal which trasmits ICA. And the jugular foramen which transmits the IJV.
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Nasal
Frontal View
Two small bones placed side by side between the frontal process of the maxillae and form by their junction the bridge of the nose.
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Vomer
Frontal View
Form part of the nasal septum together with the perpendicular plate of the ethmoid bone and articulate with the nasal bones. The nasal septum is often deviated to one side in most of the people and has both bony and cartilagenous element.
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Zygoma
Frontal View
Form the prominence of the cheek and part of the lateral walls of the orbit and articulate with the temporal bone to form the zygomatic arch.
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Maxilla
Frontal View
Form the upper jaw, the two parts together, the lower part present the alveolar process (contains sockets for upper teeth) the maxillae contain the largest air sinus in the face : maxillary sinus on each side which communicates with the nasal cavity.
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Mandible
Form the lower jaw, it is composed of two bodies united at the symphysis menti, two rami project upwards from the posterior part of the body, the point of junction is the angle of the jaw. The mandible is the strongest bone of the face and only movable bone of the skull. It articulates with the temporal bone to form TMJ
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Frontal
Parietal
Temporal
Zygoma
Nasal
Vomer
Maxilla
Mandible
Frontal View
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Frontal View
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Lateral View
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Frontal
Lateral View
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Parietal
Lateral View
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Temporal
Lateral View
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Nasal
Lateral View
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Zygoma
Lateral View
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Maxilla
Lateral View
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Mandible
Lateral View
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Sphenoid
Lateral View
The sella turcica present a saddle –shaped depression lying on the superior surface of the middle part of the sphenoid bone. It supports the pituitary gland. The parts of the sella turcica are: (1) Anterior clinoid processes, (2) Dorsum sellae = posterior clinoid processes, (3) Lamina dura which cover the floor of sella, (4) Sphenoid air sinuses.
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Occipital
Lateral View
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Mastoid Process(part from temporal bone)
Lateral View
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External Auditory Meatus
Lateral View
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Frontal
Nasal
Zygoma
Maxilla
Mandible
Parietal
Sphenoid
Temporal
Occipital
Mastoid Process
Lateral View
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Lateral View
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Frontal
Superior View
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Superior View
Parietal
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Superior View
Temporal
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Superior View
Vomer
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Superior View
Sphenoid
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Superior View
Occipital
Forms the back of the head , its inner surface is concave and contains the occipital lobes of the brain and the cerebellum, it forms part of the base of the skull.
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Superior View
Foramen Magnum
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VomerFrontal
Parietal
Occipital
Temporal
ForamenMagnum
Sphenoid
Superior View
The base of the skull is formed maily by 4 bones: (1) occipital bones, (2) Palatine bones, (3) Sphenoid bone, (4) Ethmoid bone.
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Sutures
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Sagittal
Sutures
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Sutures
Frontal)Coronal(
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Sutures
Squamous
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Sutures
Lambdoid
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Frontal)Coronal(
Sagittal
Squamous
Lambdoid
Sutures
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Sagittal
Lambdoid
Frontal
Superior Aspect
Sutures
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Skull Landmarks
1. Vertex 2. External Occipital Protuberance (E.O.P.) 3. External Auditory Meatus 4. Outer Canthus Of Eye. 5. Infra-orbital point 6. Nasion 7. Glabella
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The Anthropological lineThe Isometric “Baseline” which runs from the inferior orbital margin to the upper border of the external auditory Meatus (EAM)
1
1
2
Skull positioning lines
The Orbital- Meatal LineThe original “Baseline” which runs from the Nasion through the outer Canthus of the eye to the centre of the external auditory Meatus.
( Note: there is a difference of 10 to 15 degrees between the Orbital- Meatal line and the anthropological line.) 2
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The Interpupillary lineThe line connects the centers of the orbits and is at 90 degree to the median Sagittal plane.
3
4
4
3
The Auricular LineThis line passes at 90 degrees to the anthropological line through the centre of the external auditory meatus.
Skull Landmarks
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Skull Landmarks
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Skull Landmarks
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Cranial Topography
Glabella:Glabella: raised triangular area bet. eyebrows. Nasion:Nasion: depression at the bridge of the nose.
Acanthion:Acanthion: nose and upper lip meet
Tragus:Tragus: cartilage. flap covering ear opening. Top of ear attachment (TEA):Top of ear attachment (TEA): side frames of
eyeglass rest (level of petrous ridge).
Gonion:Gonion: angle of mandible.
InionInion: prominent point of EOP.
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Skull Series: Basic Projections
1. PA 0º
2. PA axial 15º
3. AP axial
4. Lateral
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Skull Series: Basic Projections
PA axial 15º
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Skull Series: Basic Projections
AP axial
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Skull Series: Basic Projections
Lateral
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