Chapter 7 Skeletal System: Appendicular Skeleton

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Chapter 7 Skeletal System: Appendicular Skeleton. Pectoral girdle Pelvic girdle Upper limbs Lower limbs. Pectoral (Shoulder) Girdle. Consists of scapula and clavicle Clavicle articulates with sternum Clavicle articulates with scapula Scapula held in place by muscle only - PowerPoint PPT Presentation

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  • Chapter 7Skeletal System: Appendicular SkeletonPectoral girdlePelvic girdle Upper limbsLower limbs

  • Pectoral (Shoulder) GirdleConsists of scapula and clavicle Clavicle articulates with sternum Clavicle articulates with scapula Scapula held in place by muscle onlyUpper limb attached to pectoral girdle at shoulder

  • Clavicle (collarbone)S-shaped bone with two curvesmedial curve convex anteriorly/lateral one concave anteriorlyExtends from sternum to scapula above 1st ribFracture site is junction of curves Ligaments attached to clavicle stabilize its position.

  • ScapulaTriangular flat bone found in upper back region

    posterior

  • Upper ExtremityEach upper limb = 30 boneshumerus within the armulna & radius within the forearmcarpal bones within the wristmetacarpal bones within the palmphalanges in the fingers

  • Pelvic Girdle and Hip BonesPelvic girdle = two hipbones united at pubic symphysisarticulate posteriorly with sacrum at sacroiliac jointsEach hip bone = ilium, pubis, and ischiumfuse after birth at acetabulumBony pelvis = 2 hip bones, sacrum and coccyx

  • Ilium, Ischium and Pubis

  • PelvisPelvis = sacrum, coccyx & 2 hip bonesPelvic brimsacral promontory to symphysis pubisseparates false from true pelvisfalse pelvis holds only abdominal organsInlet & outletPelvic axis = path of babies head

  • Female and Male SkeletonsMale skeletonlarger and heavierlarger articular surfaceslarger muscle attachmentsFemale pelviswider & shallowerlarger pelvic inlet & outletmore space in true pelvispubic arch >90 degrees

  • Female Male

  • Lower ExtremityEach lower limb = 30 bonesfemur and patella within the thightibia & fibula within the legtarsal bones in the footmetatarsals within the forefootphalanges in the toes

  • Arches of the FootFunctiondistribute body weight over footyield & spring back when weight is liftedLongitudinal arches along each side of footTransverse arch across midfoot regionnavicular, cuneiforms & bases of metatarsals

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