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Skeletal organization
- 1. Skeletal Organization 1 ā¢ The actual number of bones in the human skeleton varies from person to person ā¢ Typically there are about 206 bones ā¢ For convenience the skeleton is divided into the: ā¢ Axial skeleton ā¢ Appendicular skeleton
- 2. Divisions of the Skeleton 2 ā¢ Axial Skeleton ā¢ Skull ā¢ Spine ā¢ Rib cage ā¢ Appendicular Skeleton ā¢ Upper limbs ā¢ Lower limbs ā¢ Shoulder girdle ā¢ Pelvic girdle Hyoid Cranium Face Clavicle Scapula Sternum Ribs Humerus Ulna Hip bone Radius Femur Patella Tibia Fibula Tarsals Metatarsals Phalanges Phalanges Skull Vertebral column Vertebral column Sacrum Coccyx Carpals Metacarpals (a) (b) Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 3. Skull 3 ā¢ Is composed of the cranium (brain case) and the facial bones
- 4. Cranium 4 ā¢ Frontal Bone (1) ā¢ Forehead ā¢ Roof of nasal cavity ā¢ Roofs of orbits ā¢ Frontal sinuses ā¢ Supraorbital foramen ā¢ Coronal suture Parietal bone Frontal bone Coronal suture Lacrimal bone Ethmoid bone Squamous suture Sphenoid bone Temporal bone Perpendicular plate of the ethmoid bone Infraorbital foramen Vomer bone Mandible Supraorbital foramen Nasal bone Sphenoid bone Middle nasal concha of the ethmoid bone Inferior nasal concha Maxilla Mental foramen Zygomatic bone Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 5. Cranium 5 ā¢ Parietal Bones (2) ā¢ Side walls of cranium ā¢ Roof of cranium ā¢ Sagittal suture Coronal suture Frontal bone Sphenoid bone Ethmoid bone Lacrimal bone Nasal bone Zygomatic bone Maxilla Mental foramen Mandible Coronoid process Styloid process Mandibular condyle Mastoid process External acoustic meatus Temporal process of zygomatic bone Zygomatic process of temporal bone Occipital bone Temporal bone Parietal bone Lambdoid suture Squamous suture Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 6. Cranium 6 ā¢ Occipital Bone (1) ā¢ Back of skull ā¢ Base of cranium ā¢ Foramen magnum ā¢ Occipital condyles ā¢ Lambdoidal suture Zygomatic bone Palatine process of maxilla Palatine bone Occipital bone Foramen magnum Lambdoid suture Zygomatic arch Mandibular fossa Styloid process Occipital condyle External acoustic meatus Sphenoid bone Vomer bone Temporal bone Mastoid foramen Frontal bone Median palatine suture Incisive foramen Greater palatine foramen Stylomastoid foramen Foramen spinosum Carotid canal Jugular foramen Foramen ovale Foramen lacerum Condylar canal Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 7. Cranium 7 ā¢ Temporal Bones (2) ā¢ Side walls of cranium ā¢ Floor of cranium ā¢ Floors and sides of orbits ā¢ Squamous suture ā¢ External acoustic meatus ā¢ Mandibular fossa ā¢ Mastoid process ā¢ Styloid process ā¢ Zygomatic process Coronal suture Frontal bone Sphenoid bone Ethmoid bone Lacrimal bone Nasal bone Zygomatic bone Maxilla Mental foramen Mandible Coronoid process Styloid process Mandibular condyle Mastoid process External acoustic meatus Temporal process of zygomatic bone Zygomatic process of temporal bone Occipital bone Temporal bone Parietal bone Lambdoid suture Squamous suture Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 8. Cranium 8 ā¢ Sphenoid Bone (1) ā¢ Base of cranium ā¢ Sides of skull ā¢ Floors and sides of orbits ā¢ Sella turcica ā¢ Sphenoid sinusesTransverse section Lesser wing Optic canal Greater wing Sella turcica Foramen ovale Foramen spinosum Foramen rotundum Lesser wing Greater wing Superior orbital fissure Foramen rotundum Lateral pterygoid plate Medial pterygoid plate (b) (a)
- 9. Cranium 9 ā¢ Ethmoid Bone (1) ā¢ Roof and walls of nasal cavity ā¢ Floor of cranium ā¢ Wall of orbits ā¢ Cribiform plates ā¢ Perpendicular plate ā¢ Superior and middle nasal conchae ā¢ Ethmoid sinuses ā¢ Crista galli Transverse section Crista galli Orbital surface Ethmoidal sinuses Cribriform plate Crista galli Perpendicular plate Superior nasal concha Middle nasal concha Perpendicular plate (a) (b)
- 10. Facial Skeleton 10 ā¢ Maxillary Bones (2) ā¢ Upper jaw ā¢ Anterior roof of mouth ā¢ Floors of orbits ā¢ Sides of nasal cavity ā¢ Floors of nasal cavity ā¢ Alveolar processes ā¢ Maxillary sinuses ā¢ Palatine process Coronal suture Frontal bone Sphenoid bone Ethmoid bone Lacrimal bone Nasal bone Zygomatic bone Maxilla Mental foramen Mandible Coronoid process Styloid process Mandibular condyle Mastoid process External acoustic meatus Temporal process of zygomatic bone Zygomatic process of temporal bone Occipital bone Temporal bone Parietal bone Lambdoid suture Squamous suture Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 11. Facial Skeleton 11 Frontal sinus Ethmoidal sinuses Sphenoidal sinus Maxillary sinus Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 12. Facial Skeleton 12 ā¢ Palatine Bones (2) ā¢ āLā shaped bones located behind the maxillae ā¢ Posterior section of hard palate ā¢ Floor of nasal cavity ā¢ Lateral walls of nasal cavity Coronal section Horizontal portion Perpendicular portion Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 13. Facial Skeleton 13 ā¢ Zygomatic Bones (2) ā¢ Prominences of cheeks ā¢ Lateral walls of orbits ā¢ Floors of orbits ā¢ Temporal process Coronal suture Frontal bone Sphenoid bone Ethmoid bone Lacrimal bone Nasal bone Zygomatic bone Maxilla Mental foramen Mandible Coronoid process Styloid process Mandibular condyle Mastoid process External acoustic meatus Temporal process of zygomatic bone Zygomatic process of temporal bone Occipital bone Temporal bone Parietal bone Lambdoid suture Squamous suture Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 14. Facial Skeleton 14 ā¢ Lacrimal Bones (2) ā¢ Medial walls of orbits ā¢ Groove from orbit to nasal cavity ā¢ Nasal Bones (2) ā¢ Bridge of nose Coronal suture Frontal bone Sphenoid bone Ethmoid bone Lacrimal bone Nasal bone Zygomatic bone Maxilla Mental foramen Mandible Coronoid process Styloid process Mandibular condyle Mastoid process External acoustic meatus Temporal process of zygomatic bone Zygomatic process of temporal bone Occipital bone Temporal bone Parietal bone Lambdoid suture Squamous suture Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 15. Facial Skeleton 15 ā¢ Vomer Bone (1) ā¢ Inferior portion of nasal septum Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Coronal suture Frontal bone Nasal bone Palatine bone Vomer bone Alveolar processes Inferior nasal concha Maxilla Palatine process of maxilla Styloid process Sphenoidal sinus Mandible Perpendicular plate (nasal septum) Frontal sinus Crista galli Cribriform plate Foramen magnum Jugular foramen Internal acoustic meatus Sella turcica Occipital bone Parietal bone Temporal bone Lambdoid suture Squamous suture Sphenoid bone Hypoglossal canal Mastoid process Ethmoid bone
- 16. Facial Skeleton 16 ā¢ Inferior Nasal Conchae (2) ā¢ Extend from lateral walls of nasal cavity Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Coronal suture Frontal bone Nasal bone Palatine bone Vomer bone Alveolar processes Inferior nasal concha Maxilla Palatine process of maxilla Styloid process Sphenoidal sinus Mandible Perpendicular plate (nasal septum) Frontal sinus Crista galli Cribriform plate Foramen magnum Jugular foramen Internal acoustic meatus Sella turcica Occipital bone Parietal bone Temporal bone Lambdoid suture Squamous suture Sphenoid bone Hypoglossal canal Mastoid process Ethmoid bone
- 17. Facial Skeleton 17 ā¢ Mandible Bone (1) ā¢ Lower jaw ā¢ Body ā¢ Ramus ā¢ Mandibular condyle ā¢ Coronoid process ā¢ Alveolar process ā¢ Mandibular foramen ā¢ Mental foramen Coronoid process Mandibular foramen Mandibular condyle Ramus Alveolar border Mental foramen Body Body Alveolar arch Mandibular foramen Coronoid process (a) (b) Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 18. Infantile Skull 18 ā¢ Fontanels ā fibrous membranes (b) Anterior fontanel Posterior fontanel Frontal bone Frontal suture (metopic suture) Sagittal suture Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 19. Vertebral Column 19 ā¢ The vertebral column, or spinal column, consists of many vertebrae separated by cartilaginous intervertebral discs.
- 20. Vertebral Column 20 ā¢ Cervical vertebrae (7) ā¢ Thoracic vertebrae (12) ā¢ Lumbar vertebrae (5) ā¢ Sacral (4-5 fused segments) ā¢ Sacrum is fused bone ā¢ Coccygeal (3-4 fused segments) ā¢ Coccyx is fused bone (b)(a) Cervical curvature Thoracic curvature Lumbar curvature Lumbar vertebrae Thoracic vertebrae Cervical vertebrae Sacral curvature Vertebra prominens Rib facet Intervertebral Intervertebral foramina Sacrum Coccyx Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 21. Vertebral Column 21 ā¢ Cervical curvature ā¢ Thoracic curvature ā¢ Lumbar curvature ā¢ Sacral curvature ā¢ Rib facets ā¢ Vertebral prominens ā¢ Intervertebral discs (IVD) ā¢ Intervertebral foramina (IVF) (b)(a) Cervical curvature Thoracic curvature Lumbar curvature Lumbar vertebrae Thoracic vertebrae Cervical vertebrae Sacral curvature Vertebra prominens Rib facet Intervertebral Intervertebral foramina Sacrum Coccyx Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 22. Typical Vertebrae 22 ā¢ Includes the following parts: ā¢ Vertebral body ā¢ Pedicles ā¢ Lamina ā¢ Spinous process ā¢ Transverse processes ā¢ Vertebral foramen ā¢ Facets
- 23. Cervical Vertebrae 23 ā¢ Atlas ā 1st; supports head ā¢ Axis ā 2nd; dens pivots to turn head ā¢ Transverse foramina ā¢ Bifid spinous processes ā¢ Vertebral prominens ā useful landmark (b) (c) (a) Anterior Posterior Atlas Axis Body Dens (odontoid process) Spinous processDens Inferior articular process Facet that articulates with dens (odontoid process) of axis Facet that articulates with occipital condyle Spinous process Anterior articular facet for atlas Transverse foramen Transverse process Superior articular facet Vertebral foramen Transverse process Transverse foramen Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 24. Thoracic Vertebrae 24 BodySuperior articular process Spinous process Transverse process Inferior articular process Intervertebral disc Anterior Posterior Body Pedicle Vertebral foramen Superior articular process Facet for tubercle of rib Transverse process Lamina Spinous process Inferior articular process Intervertebral notch Body Pedicle Superior articular process Transverse process Facet for tubercle of rib Spinous process (a) (c) (b) ā¢ Long spinous processes ā¢ Rib facets Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 25. Lumbar Vertebrae 25 ā¢ Large bodies ā¢ Thick, short spinous processes (c) Lumbar vertebra Lamina Pedicle Body Vertebral foramen Spinous process Superior articular process Transverse process Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 26. Sacrum 26 ā¢ 4-5 fused segments ā¢ Median sacral crest ā¢ Posterior sacral foramina ā¢ Posterior wall of pelvic cavity ā¢ Sacral promontory aka base ā¢ Area toward coccyx is the apex Sacral canal Tubercle of median sacral crest Auricular surface Posterior sacral foramen Sacral hiatus Coccyx Sacrum Superior articular processSacral promontory Anterior sacral foramen (a) (b) Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 27. Coccyx 27 ā¢ Aka tailbone ā¢ 3-4 fused segments Sacral canal Tubercle of median sacral crest Auricular surface Posterior sacral foramen Sacral hiatus Coccyx Sacrum Superior articular processSacral promontory Anterior sacral foramen (a) (b) Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 28. Thoracic Cage 28 ā¢ The thoracic cage includes the ribs, the thoracic vertebrae, the sternum, and the costal cartilages that attach the ribs to the sternum.
- 29. Thoracic Cage 29 ā¢ Ribs (12) ā¢ Sternum ā¢ Thoracic vertebrae (12) ā¢ Costal cartilages ā¢ Supports shoulder girdle and upper limbs ā¢ Protects viscera ā¢ Role in breathing 1 2 3 4 5 6 7 8 9 10 11 12 True ribs (vertebrosternal ribs) Vertebrochondral ribsFalse ribs (a) Floating ribs (vertebral ribs) SternumBody Manubrium Ribs Costal cartilage Xiphoid process Thoracic vertebra Clavicular notch Sternal angle Jugular notch (suprasternal notch) (b) b: Ā© Victor B. Eichler, PhD Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 30. Ribs 30 ā¢ Humans have 12 pairs of ribs: ā¢ True ribs (7) ā¢ False ribs (5), of which: ā¢ Floating (2) ā¢ There are some anomalies: ā¢ Cervical ribs ā¢ Lumbar ribs 1 2 3 4 5 6 7 8 9 10 11 12 True ribs (vertebrosternal ribs) Vertebrochondral ribsFalse ribs (a) Floating ribs (vertebral ribs) SternumBody Manubrium Ribs Costal cartilage Xiphoid process Thoracic vertebra Clavicular notch Sternal angle Jugular notch (suprasternal notch) (b) b: Ā© Victor B. Eichler, PhD Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 31. Rib Structure 31 ā¢ Shaft ā¢ Head ā posterior end; articulates with vertebrae ā¢ Tubercle ā articulates with vertebrae ā¢ Costal cartilage ā hyaline cartilage Anterior end (sternal end) Shaft Facet Head Neck Tubercle Facet Spinous process Costal groove ShaftAnterior end Head Tubercle Neck (a) (b) Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 32. Sternum 32 ā¢ Three (3) parts of the sternum: ā¢ Manubrium ā¢ Body ā¢ Xiphoid process 1 2 3 4 5 6 7 8 9 10 11 12 True ribs (vertebrosternal ribs) Vertebrochondral ribsFalse ribs (a) Floating ribs (vertebral ribs) SternumBody Manubrium Ribs Costal cartilage Xiphoid process Thoracic vertebra Clavicular notch Sternal angle Jugular notch (suprasternal notch) (b) b: Ā© Victor B. Eichler, PhD Copyright Ā© The McGraw-Hill Companies, Inc. Permission required for reproduction or display.