group 2 bones of the skull
DESCRIPTION
Group 2 Bones of the skull. Fatin , Aishah , Zafirah , Laila, Masyitah , Amalina , Aimi. Bones of the Skull. Mandible 1 Vomer 2 Inferior nasal conchae 2 Lacrimal bones 2 Maxillae 2 Nasal bones Palatine bones 2 Zygomatic bones. 1 Ethmoid bone Frontal bone - PowerPoint PPT PresentationTRANSCRIPT
GROUP 2BONES OF THE SKULLFatin, Aishah, Zafirah, Laila, Masyitah, Amalina, Aimi
BONES OF THE SKULL
SKULL
Facial14 bones
Cranial8 Bones
1 Mandible1 Vomer2 Inferior nasal conchae2 Lacrimal bones2 Maxillae2 Nasal bones2 Palatine bones2 Zygomatic bones
1 Ethmoid bone1 Frontal bone1 Occipital bone2 Parietal bones3 Sphenoid bone4 Temporal bones
FACIAL BONES
CRANIAL BONES
ADDITIONAL SKULL FEATURES
Major sutures Paranasal sinuses Hyoid bone
Major Sutures
Functions TYPE OF
BONEFUNCTIONS
FACIAL
• Form the mechanical framework of the face
• Protect and support entry points of both the digestive and respiratory systems
• Provide attachment for some muscles of facial expression
• Protect and support organs for the senses of vivion, taste, smell, hearing and equilibrium/balance
CRANIAL
• Protection of the brain• Inner-surfaces :attach to membranes
that stabilise the positions of the brain, blood vessels and nerves
• Outer surface : act as areas of attachment for muscles that move the head in various ways
• Protect and support organs for the senses of vivion, taste, smell, hearing and equilibrium/balance
MAXILLA & MANDIBLE
Maxilla Forms the majority of the skeleton of the
face and the upper jaw Contains the maxillary sinus Articulates with the frontal, sphenoid,
nasal, vomer, and ethmoid bones; inferior nasal concha, palatine, lacrimal, and zygomatic bones; and septal and nasal cartilages
Mandible Forms the lower jaw Described as horseshoe shaped All muscles of mastication attach to the
mandible Consists of body of mandible, ramus,
coronoid process, condylar process, alveolar process
LACRIMAL & NASAL BONE
Lacrimal Bone Small and rectangular in shape Very thin and fragile Forms a small portion of medial wall of the orbit Articulates with frontal process of the maxilla,
orbital plate of the ethmoid bone, frontal bone and inferior nasal concha
The region that articulates with the frontal process of the maxilla forms the lacrimal fossa → the location of the lacrimal sac
The inferior part of the lacrimal forms a small portion of the lateral wall of the nasal cavity
Nasal Septum1. Septal Cartilage2. Ethmoid bone3. Vomer
Ethmoid Bone - Perpendicular plate• A flat plate that descend from cribriform
plate to form part of nasal septum• Articulate with vomer inferiorlyVomer• Articulate with perpendicular plate of
ethmoid, maxilla, palatine and sphenoid bone and septal cartilage
• Posterior border no articulation with other bone
Base of Nasal Cavity1. Maxilla – Palatine Process of Maxilla2. Palatine Bone – Horizontal Plate of
Palatal Bone
Maxilla - Palatine Process• Extend medially to form the majority of hard
palate• Articulate with palatine process of opposite side
and horizontal plate of palatine bone• Present of incisive foramenPalatine bone – Horizontal Plate • Form posterior portion of hard palate• Nasal cavity superiorly• On medial part, form by both horizontal plate is
posterior nasal spine• Has greater palatine foramina
Posterior Border of Nasal Cavity
• The center of sphenoid bone
• Anterior portion form part of nasal cavity
• Contain sphenoid paranasal sinuses
Sphenoid Bone - Body
Superior Border of Nasal Cavity1. Nasal Bone2. Frontal Bone3. Ethmoid Bone
• Inferior portion form superior margin of nasal aperture
• Inferior portion of nasal bone attach with lateral nasal cartilage and septal cartilage
Nasal Bone
• Articulate with nasal bone and frontal process of maxilla to form root of nose
Frontal Bone – Nasal Portion
• A horizontal bone that form superior surface of ethmoid
• Contain numerious foramina for olfactory nerves
Ethmoid Bone - Cribriform Plate
Lateral Border of Nasal Cavity1. Ethmoid Bone2. Lacrimal Bone3. Inferior Nasal Concha4. Palatine Plate
• Largest part of ethmoid bone• Descend inferiorly from the cribriform plate• Ethmoid paranasal sinuses located within• Form 2 major structure within nasal cavity
• Superior nasal concha• Middle nasal concha
Ethmoid Bone – ethmoid labyrinth
• Small and rectangular in shape• Inferior part of lacrimal form small portion
of lateral wall of nasal cavity
Lacrimal Bone
• A curved bone that form part of lateral wall of nasal cavity
• Articulate with maxilla and perpendicular plate of palatine, lacrimal, and ethmoid bone
Inferior Nasal Concha
• Shape of vertical rectangle• Superior border is a notch articulate with sphenoid
bone, form sphenopalatine foramen• Form part of lateral wall of nasal cavity
Palatine Bone – Perpendicular plate
FORAMENS OF THE BASE OF THE SKULL
What is foramen?- A foramen (pl. foramina) is an opening.- Foramina allow muscles, nerves, arteries,
veins, or other structures to connect one part of the body with another.
Superior view of
the cranial base
Inferior view of
the cranial base
Foramen Located in or
Formed by
Structures Passing through
Incisive foramen Maxilla
(palatine process)
Nasopalatine n., sphenopalatine a.
Greater palatine foramen Palatine
Greater palatine n. and vessels
Lesser palatine foramina
Lesser palatine n. and vessels
Foramen ovale
Sphenoid
Mandibular division of thetrigeminal n., accessory meningeala., lesser petrosal n., emissary v.
Foramen spinosum
Middle meningeal vessels andmeningeal branch of themandibular division of thetrigeminal n.
Foramen rotundum
Maxillary division of thetrigeminal n.
Sphenoid foramen
Emissary v.Foramen lacerumArticulation of the sphenoid (greater wing
and body), temporal
(petrous portion), and occipital
(basilar portion) bones
Nothing passes through itsphenoid Filled with fibrocartilage duringbody), temporal (petrous life (although the anterior wall of the foramen has an opening for the pterygoid canal and the posteriorwall has an opening for the carotid canal)
Mastoid foramen Temporal (mastoidportion)
Emissary v. (sometimes branches of the occipital a.)
Opening for auditory tube
Temporal and sphenoid
Cartilaginous portion of theauditory tube
Tympanic canaliculus Temporal Tympanic branch of the
glossopharyngeal n.
Jugular foramenTemporal (petrous
portion) and occipital
Glossopharyngeal n., vagus n., spinal accessory n., inferiorpetrosal sinus, sigmoid sinus,posterior meningeal a.
Mastoid canaliculus
Temporal (within the jugular fossa)
Auricular branch of the vagus n.
Petrotympanic fissure
Temporal
Chorda tympani n., anterior tympanic a.
Stylomastoid foramen
Facial n., stylomastoid a.
Tympanomastoid fissure
Auricular branch of the vagus n.Hypoglossal canal
Occipital
Hypoglossal n.Condylar canal Emissary v.,
meningeal branches ofascending pharyngeal a.
Foramen magnum
Medulla oblongata, vertebralarteries, spinal roots of the spinalaccessory n.
Foramen cecum Between the frontal and ethmoid bones
Emissary v. from nasal cavity tothe superior sagittal sinus
Anterior ethmoid foramen
Anterior ethmoid n. and vessels
Posterior ethmoid foramen
Posterior ethmoid n. and vessels
Carotid canal Temporal (petrous portion)
Internal carotid a., internal carotidn. plexus (sympathetics)
Hiatus for the lesser petrosal n.
Lesser petrosal n.
Hiatus for the greater petrosal n.
Greater petrosal n.
Internal acoustic meatus
Facial n., vestibulocochlear n.,labyrinthine a.
Opening of the vestibular aqueduct
Endolymphatic duct
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