Copyright 2010 Pearson Education, Inc. Copyright 2010 Pearson Education, Inc. Figure Sectioned spinous process. Interspinous.
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1 PowerPoint Lecture Slides prepared by Janice Meeking, Mount Royal College C H A P T E R 7 The Skeleton: Part B Vertebral Column Transmits weight of trunk to lower limbs Surrounds and protects spinal cord Flexible curved structure containing 26 irregular bones (vertebrae) Cervical vertebrae (7) vertebrae of the neck Thoracic vertebrae (12) vertebrae of the thoracic cage Lumbar vertebrae (5) vertebra of the lower back Sacrum bone inferior to the lumbar vertebrae Coccyx terminus of vertebral column Vertebral Column: Curvatures Increase the resilience and flexibility of the spine Two posteriorly concave curvatures Cervical and lumbar Two posteriorly convex curvatures Thoracic and Abnormal spine curvatures Scoliosis (abnormal lateral curve) Kyphosis (hunchback) Lordosis (swayback) C 1 Cervical curvature (concave) 7 vertebrae, C 1 C 7 es Thoracic curvature (convex) 12 vertebrae, T 1 T 12 discs Lumbar curvature (concave) 5 vertebrae, L 1 L 5 Sacral curvature (convex) 5 fused vertebrae sacrum Coccyx 4 fused vertebrae view Right lateral view Figure 7.16 Discs Cushionlike pad composed of two parts 1. Nucleus pulposus Inner gelatinous nucleus that gives the disc its elasticity and compressibility 2. Anulus fibrosus Outer collar composed of collagen and fibrocartilage Supraspinous ligament Sectioned spinous Ligamentum flavum Interspinous ligament disc longitudinal ligament longitudinal ligament Anulus fibrosus Nucleus pulposus Inferior Sectioned body of vertebra Median section of three vertebrae, illustrating the composition of the discs and the ligaments Figure 7.17a 1
2 Vertebral spinous (posterior aspect of vertebra) Spinal nerve root Herniated portion of disc Anulus fibrosus of disc (c) view of a herniated intervertebral disc Spinal cord Nucleus pulposus of disc General Structure of Vertebrae or centrum weight-bearing region Vertebral arch Composed of pedicles and laminae that, along with centrum, enclose vertebral Vertebral foramina Together make up vertebral canal for spinal cord foramina Lateral openings between adjacent vertebrae for spinal nerves Figure 7.17c General Structure of Vertebrae Seven es per vertebra: projects posteriorly es (2) project laterally es (2) protrude superiorly inferiorly Inferior es (2) protrude inferiorly PLAY PLAY Animation: Rotatable Spine (horizontal) Animation: Rotatable Spine (vertical) and Pedicle Lamina Vertebral arch Vertebral (centrum) Figure 7.18 Cervical Vertebrae C 1 to C 7 : smallest, lightest vertebrae C 3 to C 7 share the following features Oval body es are bifid (except C 7 ) Large, triangular vertebral in each transverse Table 7.2 2
3 Dens of axis ligament of atlas C 1 (atlas) C 2 (axis) C 3 Inferior Bifid spinous es C 7 (vertebra prominens) Cervical Vertebrae C 1 (atlas) and C 2 (axis) have unique features Atlas (C 1 ) No body or spinous Consists of anterior and posterior arches, and two lateral masses surfaces of lateral masses articulate with the occipital condyles (a) Cervical vertebrae Figure 7.20a Cervical Vertebrae C 1 Lateral masses arch tubercle (a) view of atlas (C 1) arch tubercle arch tubercle Inferior Lateral masses arch Facet for dens tubercle (b) Inferior view of atlas (C 1) Axis (C 2 ) Dens projects superiorly into the anterior arch of the atlas Dens is a pivot for the rotation of the atlas Figure 7.19a-b Dens C 2 Inferior (c) view of axis (C 2 ) Lamina Pedicle Thoracic Vertebrae T 1 to T 12 All articulate with ribs at s and demis Long spinous Location of s allows rotation of this area of spine Figure 7.19c 3
4 (b) Thoracic vertebrae costal (for tubercle of rib) disc Inferior costal (for head of rib) Inferior Table 7.2 Figure 7.20b Lumbar Vertebrae L 1 to L 5 Short, thick pedicles and laminae Flat hatchet-shaped spinous es Orientation of s locks lumbar vertebrae together so as to prevent rotation Table 7.2 Sacrum and Coccyx disc Inferior Sacrum 5 fused vertebrae (S 1 S 5 ) Forms posterior wall of pelvis Articulates with L 5 superiorly, and with auricular surfaces of the hip bones laterally Coccyx Tailbone 3 5 fused vertebrae Articulates superiorly with sacrum (c) Lumbar vertebrae Figure 7.20c 4
5 of first vertebra ridges (sites of vertebral fusion) Apex Sacral promontory foramina Coccyx Ala Ala Median crest foramina Sacral canal Coccyx Facet of superior Lateral crest Sacral hiatus Auricular surface (a) view (b) view Figure 7.21a Figure 7.21b Thoracic Cage Sternum (Breastbone) Composed of Thoracic vertebrae Sternum Ribs and their costal cartilages Functions Protects vital organs of thoracic cavity Supports shoulder girdle and upper limbs Provides attachment sites for many muscles, including intercostal muscles used during breathing Three fused bones Manubrium Articulates with clavicles and ribs 1 and 2 Articulates with costal cartilages of ribs 2 through 7 Xiphoid Site of muscle attachment Not ossified until ~ age 40 Ribs and Their Attachments 12 pairs All attach posteriorly to thoracic vertebrae Pairs 1 through 7 True (vertebrosternal) ribs Attach directly to the sternum by individual costal cartilages Ribs and Their Attachments Pairs 8 through12 False ribs Pairs 8 10 also called vertebrochondral ribs Attach indirectly to sternum by joining costal cartilage of rib above Pairs also called vertebral (floating) ribs No attachment to sternum 5
6 True ribs (1 7) False ribs (8 12) Jugular notch Clavicular notch Manubrium Sternal angle Xiphisternal joint Xiphoid L 1 Vertebra Floating ribs (11, 12) (a) Skeleton of the thoracic cage, anterior view Intercostal spaces Costal cartilage Costal margin Sternum Figure 7.22a Structure of a Typical Rib Main parts: Head Articulates posteriorly with s (demis) on bodies of two adjacent vertebrae Neck Tubercle Articulates posteriorly with transverse costal of same-numbered thoracic vertebra Shaft costal (for tubercle of rib) Angle of rib costal (for head of rib) of vertebra Head of rib disc Neck of rib Tubercle of rib Shaft Sternum Crosssection of rib Costal groove Costal cartilage (a) Vertebral and sternal articulations of a typical true rib Figure 7.23a Shaft Ligaments Neck of rib Articular on tubercle of rib costal (for tubercle of rib) of Head of rib thoracic costal vertebra (for head of rib) (b) view of the articulation between a rib and a thoracic vertebra Figure 7.23b 6
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