M3: Skeletal System - The Skull & The Ossicles

Skull

The most modified part of the axial skeleton.

Skull

It is the entire skeleton of the face including the mandible.

22 bones

How many skull bones are there?

8 bones

The cerebral cranium or cranial bones or braincase is composed of how many bones?

14 bones

The facial or visceral cranium is composed of how many bones?

Frontal bone

Forms the forehead and superior surface of each eye socket or orbit.

Parietal bone

On either side of the skull, found posterior to the frontal bone.

Parietal bone

Forms the roof and superior walls of the cranium at the sagittal suture.

Occipital bone

Forms the posterior and inferior portions of the cranium.

Lambdoidal suture.

Along its superior margins, the occipital bone contacts to parietal bones at the?

Foramen magnum

Admits the spinal cord to the cranial cavity.

Occipital condyle

Where the skull rests on the vertebral column.

Temporal bone

Lying below the parietal bones and contributing to the sides and base of the cranium.

Squamosal suture

As temporal bone comes it contact with the parietal bone it forms the?

Sphenoid bone

Forms the floor of the cranium.

Sphenoid bone

It also acts as a bridge uniting the cranial and facial bones, and it braces the sides of the skull.

Ethmoid bone

Consists of two honeycombed masses of bone.

Ethmoid bone

It forms part of the cranial floor, contributes to the medial surface of the orbit of each eye, and forms the roof and the sides of the nasal cavity.

Maxilla

(Other than palatine bone) Articulate with all other facial bones except the mandible.

Palatine bone

(Other than maxilla) Articulate with all other facial bones except the mandible.

Zygomatic bone

Articulates with the frontal bone and the maxilla to complete the lateral wall of the orbit.

Nasal bone

Forming the bridge of the nose midway between the orbits; articulate with the frontal bone and the maxillary bones.

Lacrimal bone

Are found within the medial wall of the orbit. They articulate with the frontal, ethmoid and maxillary bones.

Inferior nasal conchae

The paired bones that project from the lateral wall of the nasal cavity.

Mandible

It forms a broad, horizontal curve that on either side extends into two vertical processes.

Mandible

The more posterior process articulates with the mandibular fossa of the temporal bone on that side.

3 pairs

How many pairs of ear ossicles are there?

Ear ossicles

Transfers sound waves across the tympanic cavity from its membrane to the inner ear.

Tympanic cavity

Ear ossicles transfer sound waves across the ________ cavity from its membrane to the inner ear.

Malleus - Incus - Stapes

What are the 3 bones of the ear ossicles?