Acland Anatomy: The facial skeleton and the Base of the Cranium
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Deepening hollow, enclosed by temporal line ridge, lateral orbital margin and the zygomatic arch. Also contains the large temporalis muscle.
The infratemporal fossa contains, and is formed by:
- Coronoid process and the pterygolateral muscles.
- Posterior part of maxilla, base of the skull and the lateral pterygoid plates (lateral and medial) of the sphenoid
Between both medial pterygoid plates we find:
Posterior nasal cavities (Posterior Nares or Choanae)
Anterior to the Posterior Nares or Choanae and below the nasal cavity we find:
The hard palate (forms the floor of the nasal cavity).
Inside the nasal cavities we find the:
Conchae (Turbinate bones)
The posterior Nares open into the ___________, which is located between...
- The medial pterygoid plates, base of the occiput and the anterior arch of the atlas vertebrae
The floor of the cranium can be divided into 3 parts:
- Anterior Cranial fossa
- Middle Cranial fossa
- Posterior cranial fossa
The ________ _______ form the very narrow roof of the nasal cavity and transmit olphactory nerves. Directly behind is a flat area which is the roof of which cavity?
- Cribiform plates
- Sphenoid sinus
Raised, complicated bony area in the middle cranial fossa is called the ____ _______ and is the resting place for the _____ _____. Anterior to it are 2 shallow grooves for the ______ ______... And finally 4 projections :
- Sella turcica
- Pituitary gland (in the pituitary fossa)
- Optic Nerves
- Anterior and posterior Clinoid Processes
Posterior to the 2 posterior clinoid processes is the ______ _____, which pertains to this bone ________
Most of the floor of the anterior cranial fossa and roof of the orbit is formed by the:
This hollow bone forms most of the floor of the orbital cavity:
The maxilla is joined to the sphenoid posteriorly and leaves a cleft separation/opening that has a vertical part and horizontal part, what are the names of these?
- Vertical: Pterygomaxillary fissure
- Horizontal: Inferior orbital fissure
The inferior orbital fissure separates the _____ __ ___ _____ (formed by the maxilla) from the _____ ______ (sphenoid) in the orbital cavity.
- Floor of the orbit
- Lateral wall
The hollow between the pterygoid plates is called
The greater and lesser wings of the sphenoid form a triangular gap that communicates the orbit with the inside of the cranium called:
Superior orbital fissure
A Pulley hook that is found at the lower end of the medial pterygoid plate is called
Opening found between the Lacrimal and ethmoid bones, and what does it do?
- Nasolacrimal duct
- Takes tears from the corner of the eye to the nasal cavity for evaporation with respiration.
This bone forms the posterior part of the hard palate and part of the side wall of the nasal cavity.
Round opening just in front of the anterior clinoid process?
Lateral to the optic canal is a triangular opening called?
Superior orbital fissure
Below and behind the superior orbital fissure is a small opening, destined for V2, through which opening?
- Foramen rotundum
- Pterygomaxillary fissure
Opening from the middle cranial fossa (sphenoid) that goes downward destined for V3, comes out behind the lateral pterygoid plate.
Opening from the middle cranial fossa Behind and lateral to the foramen ovale we find this foramen for the middle meningeal artery
Opening in the middle cranial fossa leading downwards medial to the styloid process and what does it carry
- Carotid Canal
- internal carotid artery
Opening in front of the carotid canal that passes backwards and laterally to emerge in the middle ear, covered in cartilage and opens into the nasopharynx
Auditory tube (eustatian tube)
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