Head and Neck, Snell Flashcards
Anterior fontanelle: Shape
Diamond
Anterior fontanelle: Closed by
18 months
Posterior fontanelle: Shape
Triangular
Posterior fontanelle: Closed by
End of 1st year of life
Orbital margins: Superior
Frontal bone
Orbital margins: Lateral
Zygomatic
Orbital margins: Inferior
Maxilla
Orbital margins: Medial
Processes of maxilla and frontal bone
Within the frontal bone, just above the orbital margins
Frontal air sinuses
Facial air sinuses serve as
Voice resonators
Anterior nasal aperture is formed by
1) Nasal bones
2) Maxilla
Nasal septum is largely formed by
Vomer
Shelves of bone that project into the nasal cavity
Superior and middle conchae
Carries the upper teeth
Alveolar arch
Sinuses that communicate with nasal cavity
1) Frontal
2) Maxillary
3) Sphenoid
Maxillary sinus: Shape
Pyramid
Zygomatic bone, articulations: Medial
Maxilla
Zygomatic bone, articulations: Lateral
Zygomatic process of temporal bone
Zygomatic bone: Articulates with zygomatic process of temporal bone to form
Zygomatic arch
Most common facial fracture
Nasal fracture
Fracture of the maxilla usually result from
Direct blow to the face
Severe blow to the orbit will cause fracture of
Orbital floor
Severe blow to the orbit will cause orbital contents to go into
Maxillary sinus
Severe blow to the orbit may damage this nerve
Infraorbital nerve
Fracture of the zygoma or zygomatic arch usually results from
Blow to the side of face
Frontal bone: Articulates with parietal bone at this suture
Coronal suture
Parietal bones: Articulate with each other at
Sagittal suture
Parietal bones: Articulate with the occipital bone at
Lambdoid suture
Thinnest part to the lateral wall of skull
Pterion
Where the anteroinferior part of the parietal bone articulates with the greater wing of the sphenoid
Pterion
Pterion overlies what vessels
Anterior division of middle meningeal artery and vein
Fossae on the base of the skull
Anterior, middle, posterior
Anterior cranial fossa: Separated from middle cranial fossa by
Lesser wing of sphenoid
Anterior cranial fossa: Lodges
Frontal lobes of cerebral hemispheres
Anterior cranial fossa: Cribriform plate of ethmoid transmits
Olfactory nerves
Middle cranial fossa: Separated from posterior cranial fossa by
Petrous part of temporal bone
Middle cranial fossa: Lateral parts lodge
Temporal lobes of cerebral hemispheres
Middle cranial fossa: Middle part is raised and formed by
Body of sphenoid
Middle cranial fossa: In front of the body of sphenoid
Sulcus chiasmatis
Middle cranial fossa: Sulcus chiasmatis leads to this structure on both sides
Optic canal
Middle cranial fossa: Optic canal transmits
1) Optic nerve
2) Ophthalmic artery
Middle cranial fossa: Sella turcica lodges
Hypophysis cerebri
Middle cranial fossa: Attachment of tentorium cerebelli
Posterior clinoid processes
Middle cranial fossa: Slitlike opening between the lesser and greater wings of sphenoid
Superior orbital fissure
Middle cranial fossa: Superior orbital fissure transmits
Live Frankly To See Absolutely No Insult
1) Lacrimal
2) Frontal
3) Trochlear
4) Superior ophthalmic
5) Abducent
6) Nasociliary
7) Inferior division of oculomotor
Middle cranial fossa: Perforates the greater wing of sphenoid at medial end of superior orbital fissure
Foramen rotundum
Middle cranial fossa: Foramen rotundum transmits
Maxillary division of trigeminal nerve (V2; V1-opthalmic, V3-mandibular)
Middle cranial fossa: Perforates the greater wing of sphenoid at posterolateral to foramen rotundum
Foramen ovale
Middle cranial fossa: Foramen ovale transmits
1) Mandibular division of trigeminal
2) Lesser petrosal nerve
Middle cranial fossa: Perforates the greater wing of sphenoid posterolateral to foramen ovale
Foramen spinosum
Middle cranial fossa: Foramen spinosum transmits
Middle meningeal artery
Middle cranial fossa: Between apex of petrous part of temporal bone and sphenoid bone
Foramen lacerum
Middle cranial fossa: Foramen lacerum transmits
Internal carotid artery
Weakest part of the skull base due to numerous foramina hence commonly fractured
Middle cranial fossa
Middle cranial fossa: Specific structures particularly vulnerable to fracture
1) Cavity of middle ear
2) Sphenoidal air sinuses
Posterior cranial fossa: Lodges (3)
1) Cerebellum
2) Pons
3) Medulla
Posterior cranial fossa: Occupies central area of the floor
Foramen magnum
Posterior cranial fossa: Foramen magnum transmits (3)
1) Medulla oblongata and its meninges
2) Ascending accessory nerves
3) 2 vertebral arteries
Posterior cranial fossa: Anterolateral boundary of foramen magnum
Hypoglossal canal
Posterior cranial fossa: Hypoglossal canal transmits
Hypoglossal nerve
Posterior cranial fossa: Between petrous temporal bone and condylar part of occipital bone
Jugular foramen
Posterior cranial fossa: Jugular foramen transmits
1) IX
2) X
3) XI
4) Sigmoid sinus
Posterior cranial fossa: Sigmoid sinus leaves the skull to become the
Internal jugular vein
Posterior cranial fossa: Pierces posterior surface of petrous part of temporal bone
Internal acoustic meatus
Posterior cranial fossa: Internal acoustic meatus transmits
1) VI
2) VII
Largest and strongest bone of the face
Mandible
Mandible: Faint ridge at midline of external surface
Symphysis menti
Mandible: Mental foramen transmits
Inferior alveolar nerve
Mandible: Medial surface of body
Submandibular fossa
Mandible: Submandibular fossa lodges
Submandibular gland
Mandible: Anterior to the submandibular fossa
Sublingual fossa
Mandible: Sublingual fossa lodges
Sublingual gland
Mandible: Between the sublingual and submandibular fossa
Mylohyoid line
Mandible: Alveolar part contains how many sockets
16
Ramus of mandible: Anterior process
Coronoid
Ramus of mandible: Posterior process
Condyloid process or head
Ramus of mandible: Coronoid and condyloid processes are separated by
Mandibular notch
Mandible: Neck is located
Inferior to condyloid process or head
Mandible: Medial surface of ramus
Mandibular foramen
Mandible: Mandibular foramen transmits
Inferior alveolar nerve
Mandible: Articulates with the temporal bone
Condyloid process
TMJ, ligaments: Fibers extend downward and backward
Lateral temporomandibular ligament
TMJ, ligaments: Lateral temporomandibular ligament limits
Posterior movement of mandible
TMJ, ligaments: Permits gliding movement in the upper part of the joint and hinge movement on the lower part of the joint
Articular disc
TMJ, muscles: Protrusion
Lateral pterygoid muscle
TMJ, muscles: Retraction
Posterior fibers of temporalis
TMJ, muscles: Depression (3)
1) Digastric
2) Geniohyoid
3) Mylohyoid
TMJ, muscles: Elevation (3)
1) Temporalis
2) Masseter
3) Medial pterygoid
Muscles of mastication (4)
1) Masseter
2) Temporalis
3) Lateral pterygoid
4) Medial pterygoid
Muscles of mastication: Innervation
Mandibular division of trigeminal
Muscles of mastication: Develop from
First pharyngeal arch
Mandible: Seen below the 2nd premolar tooth
Mental foramen