1 / 27

THE SKULL

THE SKULL. 2 Divisions Cranium Face. Most complex bony structure 22 bones in all Mostly flat bones, but not all!. Cranial Bones: 8. Friday Find and describe: 1. frontal bone 2. occipital bone 3. sphenoid bone 4. ethmoid bone 5. parietal bones (2) 6. temporal bones (2).

glora
Download Presentation

THE SKULL

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. THE SKULL 2 Divisions Cranium Face

  2. Most complex bony structure • 22 bones in all • Mostly flat bones, but not all!

  3. Cranial Bones: 8 • Friday Find and describe: • 1. frontal bone • 2. occipital bone • 3. sphenoid bone • 4. ethmoid bone • 5. parietal bones (2) • 6. temporal bones (2)

  4. Functions of Cranial Bones • Enclose and protect the brain • Attachment sites for head and neck muscles

  5. Functions of Facial Bones • 1. form framework of face • 2. contain cavities for special sense organs • 3. openings for food/air passage • 4. secure the teeth • 5. anchor the facial muscles of expression

  6. ALL BONES OF THE SKULL ARE FIRMLY LOCKED IN PLACE BY JOINTS CALLED SUTURES • Four major sutures

  7. THE CRANIUM (8) 1 frontal bone 2 parietal bones 2 temporal bones 1 occipital bone 1 sphenoid bone 1 ethmoid bone

  8. THE FRONTAL BONE

  9. Parietal Bones: Form most of the superior and lateral aspects of the skull Figure 7.3a

  10. Parietal Bones • Curved, rectangular bones forming majority of the cranium • All four major sutures articulate with this bone

  11. Look up the 4 major sutures of the skull

  12. Parietal Bones and Major Associated Sutures • Four sutures mark the articulations of the parietal bones • Coronal suture – articulation between parietal bones and frontal bone anteriorly • Sagittal suture – where right and left parietal bones meet superiorly • Lambdoid suture – where parietal bones meet the occipital bone posteriorly • Squamosal or squamous suture – where parietal and temporal bones meet

  13. Occipital Bone and Its Major Markings • Forms most of skull’s posterior wall and base • Major markings include the posterior cranial fossa, foramen magnum, occipital condyles, and the hypoglossal canal Figure 7.2b

  14. Temporal Bones • Lateral sides of the skull • Zygomatic process connects with zygomatic arch • External auditory meatus (external ear) • Styloid process muscle attachment for tongue and neck • Mastoid process neck muscles

  15. Temporal Bones Figure 7.5

  16. Sphenoid Bone • Spans width of middle cranial fossa • Articulates with all other cranial bones • Three parts greater wing, lesser wing and pterygoid processes • Sella turcica enclosure for pituitary gland

  17. Ethmoid Bone • Complex shape • Nasal cavity and orbital cavity • Cribriform plate roof of the nasal cavity • Crista galli- outermost covering of the brain cover connects here

  18. Maxillary Bones • Medially fused bones that make up the upper jaw and the central portion of the facial skeleton • Facial keystone bones that articulate with all other facial bones except the mandible • Their major markings include palatine, frontal, and zygomatic processes, the alveolar margins, inferior orbital fissure, and the maxillary sinuses

  19. Maxillary Bone Figure 7.8b

More Related