Vertebral Column and bony thorax

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Vertebral Column and bony thorax. Vertebral Column and bony thorax. Formed from 34-56 bones in the different adult animals Extends from skull to pelvis Transmits weight of trunk to the lower limbs Surrounds and protects the spinal cord. Vertebral Column. 1- Cervical Vertebrae - PowerPoint PPT Presentation

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  • Vertebral Column and bony thorax

  • Vertebral Column and bony thoraxFormed from 34-56 bones in the different adult animals Extends from skull to pelvis Transmits weight of trunk to the lower limbs Surrounds and protects the spinal cord

  • Vertebral Column 1- Cervical Vertebrae

    2- Thoracic Vertebrae

    3- Lumbar Vertebrae

    4- Sacrum

    5- Coccyx (Caudal)

  • Typical Vertebrae:Consists of:

    1- Body (1)

    2- A vertebral arch - right and left Pedicles and Lamiae

    3- Transverse process (7)

    4- Spinous process (9)

    5- Articular process (5)

  • Cervical Vertebrae Seven cervical vertebrae (C1 C7) smallest and lightest vertebrae C3 C7 are typical cervical vertebrae Body is small, wider side to side Spinous processes - short and bifid (except C7) Vertebral foramen - large and triangular Transverse processes- contain transverse foramina

  • Atlas C1Lacks a body and spinous process No intervertebral disc between C1 and C2 Supports the skull Cranial articular facets receive the occipital condyles (Atlanto-occipital Joint)

  • The Axis - C2The most prominent feature is ridge like spinous process

    Cranially the body project peg like eminence (the dens)

  • Vertebrae (T1 T13)All articulate with ribs Spinous process- long, sharp, projects caudally The spine of 11th vertebrae is perpendicular (anticlinal).12th and 13th process project cranially Vertebral Foramen - circular Each side of the body bears demifacets for articulation with ribs

  • Lumbar Vertebrae (L1 L5)Body large, kidney shaped Transverse processes are thin and tapered Spinous processes are short, thick, blunt, and point caudally

  • Sacrum (S1 S3)Formed from 3 fused vertebrae

  • Coccyx (Caudal):Is the "tailbone" Small, triangular bone Formed from 15-20 vertebrae Offers only slight support to pelvic organs

  • Intervertebral Discs Cushion-like pads between vertebrae Nucleus pulposus gives the disc its elasticity and compressibility Annulus fibrosis strong outer ring of fibrocartilage which surrounds the nucleus pulposus and limits its expansion

  • Bony ThoraxForms the framework of the chest Components of the bony thorax Thoracic vertebrae dorsally Ribs laterally Sternum and costal cartilage ventrally Functions Protects thoracic organs Supports shoulder girdle and upper limbs Provides attachment sites for muscles

  • SternumComposed form eight unpaired segments, the sternbrae. Joined by intersternebral cartilagesManubrium 1st sternbra

    Xiphoid process last sternbra

  • Ribs13 pairs, form the sides of the thoracic cage All ribs attach to vertebral column dorsally True ribs - superior nine pairs of ribs which attach directly to sternum by costal cartilage False ribs remaining 3 pairs of ribs which attach indirectly to the sternumFloat ribs-rib#13

  • - StructureShaft bulk of the rib Head dorsally most end Neck constricted portion of head beyond head Tubercle articulates with transverse process of the thoracic vertebrae