Appendicular skeleton

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anatomy lecture 2

Text of Appendicular skeleton

  • 1. Appendicular skeleton1 9/8/2014

2. ClavicleThe clavicle: collar bone, articulates medially with the manubrium of thesternum and laterally with the acromion of the scapula2 9/8/2014 3. Scapula (shoulder blade) 4. Scapula Glenoid cavity articulates withthe humerus Acromium articulates withclavicle Coracoid process projectsanteriorly 5. Humerus ( bone of the arm) Humerus is the only bone in the arm Head of humerus fits into glenoid cavityof scapula Distal & medially, trochlea articulateswith the ulna Distal & laterally capitulum articulateswith the radius the elbow joint. is a hinge joint thatallows flexion and extension of theforearm.5 9/8/2014 6. Ulna and RadiusThe forearm contains two bones:the lateral bone is the radiusthe medial bone is the ulna7 9/8/2014 7. In the anatomical position, the radiusis lateral (thumb side); with pronationthe palm faces posteriorly and thebones crossLeft forearmProne: body lying face downSuppine: body lying face upAnatomical positionpronepronation moves the forearm into the proneposition and supination moves it back to theanatomical position 8. Proximal is wrist 8 carpalbones Palm of hand - 5 metacarpals Fingers (or digits) consist ofminiature long bones calledphalanges: thumb (pollex)has 2; fingers have 3: proximal,middle, distalHand 9. Pelvic Girdle(Hip Girdle) Strongly attached to axial skeleton (sacrum) Deep sockets More stable than pectoral (shoulder) girdle Less freedom of movement Made up of the paired hip bones Bony pelvis is basin-like structure: hip bones plus the axial sacrum and coccyx 10. Pelvic bones13 9/8/2014 11. 14 9/8/2014 12. FemurThe femur is the bone of the thigh. At its distal end articulation is with thetibia, but it also articulates anteriorlywith the patella (knee cap). The patella is the largest sesamoidbone in the body.15 9/8/2014 13. The leg contains two bones:The tibia is medial in position, is larger thanthe laterally positioned fibula, and is theweight bearing bone;The fibula does not take part in the kneejoint and forms only the most lateral part ofthe ankle joint-proximally16 9/8/2014 14. The bones of the foot The bones of the foot consist of the tarsal bones the metatarsals, and thephalanges. There are seven tarsal bones, which are organized in two rows with anintermediate bone between the two rows on the medial side. Inversion and eversion of the foot, or turning the sole of the foot inward andoutward, respectively, occur at joints between the tarsal bones. 15. 9/8/2014 16. Arches 17. Types of movement20 9/8/2014 18. 21 9/8/2014 19. 22 9/8/2014