Palatine processes project posteriorly forming the

This preview shows page 20 - 23 out of 29 pages.

fused medially, alveolar margins hold teeth of upper jaw. Palatine processes project posteriorly forming the anterior 2/3 of hard palate. Incisive fossa (passage of blood vessels and nerves), frontal processes and zygomatic processes. Main portion of bone on each side has maxillary sinus – these are the sinuses that get infected. All facial bones articulate with the maxilla except for the mandible. Articulates with zygomatic bone via their zygomatic processes - Zygomatic bones: cheekbones. Articulate with zygomatic processes of maxilla, temporal bones and frontal bones. Contribute to inferolateral margins of orbit. - Nasal bones: 2 tiny, rectangular bones that fuse medially to form bridge of nose. Articulate with frontal bone superiorly and maxillary bones laterally. - Lacrimal Bones: 2 fingernail-shaped bones in anterior, medial portion of orbit. Articulates with frontal bone, ethmoid bone, maxillae. Each has a depression (lacrimal fossa) for lacrimal sac. - Orbits: zygomatic, frontal, maxilla, ethmoid, lacrimal, sphenoid, palatine (orbital process).
- Palatine bones: 2 L-shaped bones. Horizontal plates form posterior part of hard palate. Verticle plates – nasal cavity and orbit. Palatine processes project from the teeth and fuse, forming anterior 2/3 of the hard palate. - Vomer: single thin bone forms nasal septum. - Inferior Nasal Conchae: superior and middle nasal conchae from ethmoid bone. Thin, curved bones – project medially. Largest of 3 pairs of conchae. - Nasal cavity: roof (cribiform plate of ethmoid). Lateral walls (superior and middle concha of ethmoid perpendicular plate of palatine bone, inferior nasal concha). Floor (palatine processes of maxillae and palatine bones). - Nasal Septum: nasal septum – creates left and right parts of the nasal cavity. Vomer forms bony portion inferiorly. Perpendicular plate of ethmoid forms superior aspect. Septal cartilage forms anterior aspect. - Paranasal sinuses: frontal, maxillary, sphenoid, ethmoid. Mucosa lined, air filled. Lighten the skull and enhance resonance of voice. Connect to nasal cavity so also help to warm and humidify incoming air. - Hyoid: only bone in the body that does not articulate with any other bones. Supports tongue and gives attachment to muscles for swallowing and speech. Horse-shoe shaped with a body and two pairs of horns.
- Vertebral column: 33 bones of which 24 remain separate (flexibility) and the remaining 9 fuse to form 2 composite bones (sacrum and coccyx), 26 bones in the adult. Functions include: provides column of support (transports body’s weight to lower limbs), protects the spinal cord, anchor for muscle and ligament attachments, maintains upright position. Sacrum and coccyx are irregular bones. - Spinal Curves: primary curves (develop before birth) and secondary curves (develop after birth). - Cervical Curve: secondary; develops as infant learns to balance head on neck - Thoracic Curve: primary; accommodates thoracic organs (heart/lungs) - Lumbar Curve: secondary; develops with ability to stand; balances trunk over lower limbs - Sacral Curve: primary; accommodates reproductive organs.

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture