A&P 1 Chapter 7 Study Set (skull bones)

cranial cavity

A fluid-filled chamber that cushions and supports the brain.

mastoid process

An attachment site for muscles that rotate or exten the head.

sutures

Immovable joints or connections between the skull bones of adults. At these, bones are tied firmly together with dense fibrous connective tissue.

articulations

Joints are also called what?

styloid process

Near the base of the mastoid process, is attached to ligaments that support the hyoid bone and to the tendons of several muscles.

coronal suture

This suture attaches the frontal bone to the parietal bones of either side.

sagittal suture

This suture extends from the lambdoid suture to the coronal suture, between the parietal bones.

squamous suture

This suture on each side of the skull forms the boundary between the temporal bone and the parietal bone of that side.

calvaria

The occipital, parietal, and frontal bones from this, also called skullcap.

external occipital crest

This, which begins at the external occipital protuberance, extends inferiorly and marks the attachment of a ligament that helps stabilize the vertebrae of the neck.

zygomatic bones

These bones contribute to the rim and lateral wall of the orbig and form part of the cheekbone.

inferior nasal conchae

These bones create turbulence in air passing through the nasal cavaity, and increase the epithelial surface area to promote warming and humidification of inhaled air.

lacrimal bones

These bones form part of the medial wall of the orbit ( eye socket)

cranial bones

These bones form the cranium, which encloses the cranial cavity, a fluid-filled chamber that cushions and supports the brain.

palatine bones

These bones form the posterior portion of the hard palate and contribute to the floor of each orbit.

parietal bones

These bones on each side from part of the superior and lateral surfaces of the cranium.

temporal bones

These bones on either side 1. forms part of the lateral wall of the cranium and articulates with facial bones, 2. forms an articulation with the mandible, 3. surrounds and protects the sense organs of the inner ear, and 4.is an attachment site for muscles that close the jaws and move the head.

facial bones

These bones protect and support the entrances to the digestive and respiratory tracts. They also provide areas for the attachment of muscles that control facial expressions and assist in manipulating food.

nasal bones

These bones support the superior portion of the bridge of the nose. They are connected to cartilages that support the distal portions of the nose.

maxillae

These bones support the upper teeth and form the inferior orbital rim, the lateral margins of the external nares, the upper jaw, and most of the hard palate.

occipital bone

This bone contributes to the posterior, lateral, and inferior surfaces of the cranium.

sphenoid

This bone forms part of the floor of the cranium, unites the cranial and facial bones, and acts as a crossbrace that strengthens the sides of the skull.

frontal bone

This bone forms the anterior portion of the cranium and the roof of the orbits. Mucous secretions of the frontal sinuses within this bone help flush the surfaces of the nasal cavitites.

ethmoid

This bone forms the anteromedial floor of the cranium, the roof of the nasal cavity, and part of the nasal septum and medial orbital wall.

vomer

This bone forms the inferior portion of the bony nasal septum.

mandible

This bone forms the lower jaw.

cranium

This encloses the cranial cavity.

axial skeleton

This part of the skeleton forms the longitudinal axis of the body.

lambdoid suture

This suture arches across the posterior surface of the skull. This suture separates the occipital bone from the two parietal bones. One or more sutural bones may be present along this suture.