1 / 30

Axial Skeleton

Axial Skeleton. Bones of the Axial Skeleton. Number of bones Names of regions Special features (handout) Suture Meatus Process Fossa Foramen Fissure Condyle. Bones of the Skull. 28 Bones Cranium – 8 Face – 14 Ossicles - 6

rudolf
Download Presentation

Axial Skeleton

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Axial Skeleton

  2. Bones of the Axial Skeleton • Number of bones • Names of regions • Special features (handout) • Suture • Meatus • Process • Fossa • Foramen • Fissure • Condyle

  3. Bones of the Skull • 28 Bones • Cranium – 8 • Face – 14 • Ossicles - 6 • All joined by immoveable joints except the lower jaw (mandible).

  4. Cranial Bones – 8 Bones • Enclose and protect the brain. • Dome shape – strongest architectural shape. • Connected by immoveable joints – sutures.

  5. Frontal Parietal Temporal Occipital

  6. Sutures Coronal Sagittal Lambdoidal Squamous

  7. Temporal Bone – Special Features Mandibular Fossa External Auditory Meatus Zygomatic Process Mastoid Process Styloid Process

  8. Occipital Bone – Special Features • Foramen magnum

  9. Sphenoid • Single bone which extends across the skull behind each orbital cavity. • Forms the temples.

  10. Sphenoid Special Features • Optic foramen • Superior orbital fissure

  11. Ethmoid • Posterior to the nasal bone. • Not visible from the outside. Ethmoid

  12. Sinuses • Air filled cavities. • Used for speech. • Passageways for blood vessels and nerves. • Named for the bone that contains them. • Frontal • Ethmoid • Sphenoid • Sphenoid • Maxillary

  13. Facial Bones - 14 • Enclose and protect the facial organs. • Mandible – 1 • Largest and strongest bone of the skull. • Only moveable bone of the skull. • Mandibular condyle • TMJ. • Tooth socket

  14. Maxilla • Upper jaw bone and extends into the mouth forming the hard palate. • 2 bones which fuse before birth. • Tooth socket

  15. Clef Palate/Hair lip

  16. Facial Bones Palatine Nasal Zygomatic Lacrimal Inferior Concha Vomer

  17. Ossicles - 6 bones • 3 bones in each middle ear region. • Smallest bones of the body. • Completely ossified at birth. • Vibrate to carry sound waves into the inner ear where the sound receptors are located. • Malleus – hammer • Incus – anvil • Stapes - stirrup

  18. Hyoid • Single bone • Located in the neck under the tongue. • Only floating bone of the body. • Does not articulate with any other bone.

  19. Vertebral Column • Flexible group of 26 articulated vertebra. • Cervical Curve • Holds head up • Thoracic curve • To sit up • Lumbar curve • To stand up and walk

  20. Cervical Vertebra • 7 bones – breakfast • 1st cervical vertebra is the atlas • Articulates with occipital bone • Allows for nodding head “yes” • 2nd cervical vertebra is the axis • Articulates with atlas • Allows for shaking the head “no”

  21. Thoracic Vertebra • 12 bones – lunch. • All of the ribs connect to thoracic vertebra. • Looks like a giraffe.

  22. Lumbar Vertebra • 5 bones – supper. • Looks like a moose.

  23. Sacrum • Several bones fuse into one bone. • Coccyx • Several bones fuse into one bone. • Tail bone.

  24. Spinous process • Process on the posterior side. • Can be palpated. • Transverse process • Processes on the lateral sides. • Vertebral foramen • Hole in the center of all vertebra except sacrum and coccyx • Houses the spinal cord • Body • Flat area separated by intervertebral disks.

  25. Cervical • 3 foramen • Thoracic • Giraffe • Lumbar • Moose

  26. Vertebral column is flexible due to a pad of cartilage between the bones. • Intervertebral disk • Holes between each of the vertebra except the sacum and coccyx for nerves to connect to the spinal cord. • Intervertebral foramen

  27. Swayback Hunchback

  28. Sternum • Manubrium – upper shield • Contains the jugular notch for the jugular veins. • Body • Used in CPR to compress the heart between the sternum and vertebral column. • Xiphoid process • Cartilage section

  29. CPR Compression of the heart between the sternum and the thoracic vertebra.

  30. Ribs • 24 bones • Attached to the sternum by costal cartilage. • True ribs – 14 bones • Direct attachment to sternum • False ribs – 6 bones • Attach to the last true ribs • Floating ribs – 4 bones • Do not attach to the sternum • All attach to thoracic vertebra

More Related