OPT 114: Orbit - Bones

skull

skeleton of the head

the skull is made up of... (2)

cranium and face

bones meet at...

sutures

frontal bone

forms anterior portion of the cranium, anterior floor, and superior part of the face; forms forehead and orbital roof

Frontal

What is the green bone?

parietal bone

form the roof and lateral sides

Parietal bone

What is "1"?

temporal bone

forms the floor and lateral sides

Temporal bone

What is "2"?

occipital bone

forms posterior portion of the cranium and posterior floor

the foramen magnum is found in the inferior aspect of the ________ ________.

occipital bone

Occipital bone

What is the green section?

sphenoid bone

forms the floor and has 3 portions

body of the sphenoid

houses the pituitary gland in a depression called the sella turcica

lesser wings of the sphenoid

project from anterior aspect of the body

greater wings of the sphenoid

project from lateral aspect of the body

Sphenoid

What's "1"?

Lesser wing

What's "1"?

Greater wing

What's "2"?

The body of the sphenoid

What's "3"?

ethmoid bone

Bone that forms the posterior nasal septum and the medial walls of the eye sockets; has 4 parts

vertical/perpendicular plate (ethmoid)

forms the nasal septum

horizontal/cribriform plate (ethmoid)

olfactory nerves pass through the plate

labyrinths (x2)

house ethmoidal sinuses

Ethmoid Bone (perpendicular plate)

What is "4"?

palatine bone (x2)

extends from the hard palate at the back of the mouth to the orbital floor

lacrimal bone (x2)

located along the medial wall of the orbit

nasal bone (x2)

forms the bridge of the nose

inferior conchae (x2)

Located along lateral wall of nasal cavity

vomer

forms the posterior part of the nasal septum

zygomatic bone (x2)

Forms lateral part of cheekbone and the lateral wall and floor of the orbit

maxillary bone (x2) (maxilla)

forms the upper jaw, the cheek, the hard palate, the lateral wall of the nasal cavity, and the floor of the orbit

mandible

forms moveable lower jaw

palatine bone

What is "1"?

lacrimal bone

What is "2"?

zygomatic bone

What is "3"?

inferior conchae

What is "4"?

The orbit is shaped like a __-______ pyramid with the apex posteriorly and and the base anteriorly.

4-sided

7 bones forming orbit

frontal, palatine, lacrimal, zygomatic, maxillary, sphenoid, ethmoid

The floor is formed by the...

palatine, zygomatic, maxillary (My Pal Max gets his Zzz on the Floor.)

The weakest wall in the orbit is the....

floor

infraorbital groove/canal

groove/canal in maxillary bone

The medial wall is formed by the...

ethmoid, maxillary, lacrimal, and sphenoid. (My Middle Ex Max Likes Sally.)

The thinnest wall in the orbit is the...

medial wall

The lateral wall is formed by the...

zygomatic and sphenoid (greater wing) bones

The 4 paranasal sinuses are the...

maxillary, sphenoid, ethmoid, and frontal (FEMS)

Frontal sinuses

What's "1"?

Ethmoidal sinuses

What's "2"?

Sphenoidal sinuses

What's "3"?

Maxillary sinuses

What's "4"?

sinusitis

when air cavities become infected