lab bone 2

Anterior View of the Skull

Frontal Bone

  • The frontal bone is the most superior bone in the anterior view of the skull.

Key Facial Bones

  • N M L E mnemonic:

    • Nasal bone

    • Maxillary bone

      • Largest facial bone, encircles part of the face.

    • Lacrimal bone

    • Ethmoid bone

      • Located centrally, major part of the nasal cavity structure.

Eye Socket Structures

  • Superior Orbital Fissure: A slit-like opening found in the eye socket.

  • Optic Foramen: Small hole where the optic nerve passes from the brain to the eye.

    • Demonstrated by pointing through its position in the skull.

Supraorbital Region

  • Supraorbital Margin: Ridge that runs above the orbit of the eye.

  • Supraorbital Foramen: Opening above the orbit where vessels and nerves pass to the forehead.

  • Infraorbital Foramen: Located below the orbit, serves a similar purpose to the supraorbital foramen.

  • Mental Foramen: Located on the mandible to transmit nerves and blood vessels to the lower lip.

Nasal Cavity

  • The maxillary bone shapes the upper jaw and contains the nasal cavity.

  • Ethmoid Bone: Includes the Perpendicular Plate which helps form the nasal septum with the vomer.

    • Vomer: A bone that, along with the perpendicular plate of the ethmoid, separates the nasal cavity halves.

Nasal Concha

  • Inferior Nasal Concha: Positioned at the bottom of the nasal cavity.

  • Middle Nasal Concha: Located higher within the nasal cavity.

  • Superior Nasal Concha: Cannot be seen in the anterior view but is present higher up.

Alveolar Processes

  • Bumpy ridges along the maxilla and mandible where teeth are held.

  • Gomphosis: A type of fibrous joint connecting teeth to their sockets.

Posterior View of the Skull

Overview of Bones

  • Parietal Bone: Paired bones forming the sides and upper back of the skull.

  • Occipital Bone: Located at the back and bottom of the skull.

  • Mandible: Lower jaw structure can be seen.

Sutures

  • Lambdoid Suture: Looks like an upside-down 'V'; connects the parietal bones to the occipital bone.

  • Sagittal Suture: Runs along the sagittal plane, dividing the two parietal bones.

  • Coronal Suture: Runs from side to side along the front of the skull.

  • Squamous Suture: Connects the temporal bone to the parietal bone.

Processes

  • Mastoid Processes: Protrusions behind the ear, serve as muscle attachment points.

  • Styloid Process: Sharp, pointed bone structure on either side used for muscle attachment.

  • Occipital Condyles: Rounded projections that articulate with the first cervical vertebra (atlas).