MSA1: Skeletal Stxrs/Bones of Axial Skeleton

a rounded prominence that usually articulate with another bone

A narrow sharp ridge

a projection situated above a condyle

a small, nearly flat surface

a cleft or groove

a soft spot in the skull where a membrane covers the spaces between the skull

an opening through a bone that usually serves as a passageway for blood vessels, nerves, or ligaments

a large pit or depression

a small pit or depression

an enlargement of the end of a bone (typically articular)

a narrow ridge (straight line)

A prominent projection on a bone

a branch or similar extension

A hole within a bone

a thorn-like projection

an interlocking line of union between bones (eg- frontal suture in skull)

A large process

A bigger process usually larger than the tubercle

• Frontal Bone
• Parietal Bone
• Occipital Bone
• Temporal Bone
• Sphenoid Bone
• Ethmoid Bone

• (cranial bone)
• forms forehead and roof of orbits and nasal cavity
• Special features: frontal sinuses and supraorbital foramen

• (cranial bone)
• Posterior to Frontal bone: joins frontal bone at CORONAL suture
• Forms sides of skull
• Parietal bones joined at SAGITTAL suture
• Joins Occiput bone at LAMBDOIDAL suture

• (cranial bone)
• Back of skull and most of the base of cranium
• Special feature: foramen magnum and external occipital protuberance (EOP)

• (cranial bone)
• Inferior to Parietal bones
• Forms sides of skull
• Special Features: External Auditory Meatus (EAM), Styloid Process, Mastoid Process

• (cranial bone)
• Floor of the Cranium- wedged in anterior part of cranium
• 2 Wings: Lesser Wing, Greater Wing (looks like a butterfly)
• Special Features: Sphenoid Sinuses

• (cranial bone)
• Floor of Cranium, anterior to sphenoid bone
• Special Features: Ethmoid Sinuses

• Maxillary
• Zygomatic
• Lacrimal
• Nasal
• Mandible

• (facial bone)
• upper jaw
• forms hard palate (roof of mouth), floor orbits, and floor/sides of nasal cavity
• Contains sockets for ____ teeth
• *Maxillary sinuses (floor of orbit to upper teeth)

• (facial bones)
• "cheek bone"
• joins temporal bone to form "zygomatic arch"

• forms medial portion of orbits
• provides small passage way from eye to nasal cavity- allows tears to flow into nasal cavity

• (facial bones)
• forms the bridge of nose
• rectangle bones fused at midline

• (facial bone)
• only movable bone of facial skeleton
• lower jawbone

• Forms vertical axis of skeleton
• Composed of 26 vertebrae (adults) separated by intervertebral discs (fibrocartilage)
• Protects spinal cord
• 4 curvatures (thoracic/pelvic=concave ant) (cervical/lumbar=convex ant.)

anterior portion: intervertebral discs

form sides of vertebral foramen

fuse to become spinous process

made up of pedicles, laminae, and spinous processes: around vertebral foramen

between pedicles and laminae: posterior bony projections

Cartilage covered facets- joins vertebrae above and below

lower surface of pedicles: opening for spinal nerves

7 (form axis of neck)

12 (pointed spinous process)

5

5 fused vertebrae

4 fused vertebrae

• Ribs
• Thoracic Vertebrae
• Sternum
• Costal Cartilage

• 12 sets:
• 1st 7= true ribs
• 8-12= false (11 & 12= floating)

• Manubrium- upper
• Body- middle
• Xiphoid Process- bottom
• 

formed by jxn of manubrium and body of sternum

superior border of manubrium