ANP1106C Jan 21.docx - ANP1106C Lecture 5 Skeletal System V Joints I Lower limbs Carry entire erect body weight(whole lotta jumping\/running force

ANP1106C Jan 21.docx - ANP1106C Lecture 5 Skeletal System V...

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Jan 21, 2020 ANP1106C Lecture 5: Skeletal System V + Joints I Lower limbs - Carry entire erect body weight (whole lotta jumping/running force) - Thicker than upper limbs - 3 segments: thigh, leg, foot Knee + Thigh bones - Femur (thigh): strongest, longest bone (1/4 th height); 280 kg/cm 2 (2 tonnes/square inch), cannot palpate (unlike ulna + radius) o Articulates hip bone, courses medially knees (balance, knee joints center of gravity; more so in women bc wider pelvis) o Head + fovea capitis + neck (femur neck = weak fracture = broken hip) o Greater + Lesser trochanter: attach thigh + buttock muscles o Gluteal tuberosity, linea aspera, medial + lateral supracondylar lines: muscle attach o Lateral + medial condyles: distal; articulate tibia; attach muscles o Patellar surface: smooth; between condyles; articulates patella (kneecap) - Patella: triangular sesamoid bone; within quadricep tendons (anterior thigh muscles tibia); protects knee joint + improves thigh muscle leverage
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Tibia + Fibula - Parallel bones forming leg (knee ankle); interosseous membrane connects, articulate w/ each distally + proximally; tibiofibular joints: no movement dec. flexibility; inc. strength/stability; medial tibia articulates femur (proximally; knee hinge joint) + talus/ankle (distally) (fibula NO knee joint – only stabilizes ankle joint) - Tibia: body weight femur foot; second largest bone; o Medial + lateral condyles: proximal; articulate femur condyles o Tibia tuberosity: attach patellar ligaments o Tibia articulates talus (distally) o Medial malleolus: ankle medial bulge o Fibular notch: in inferior tibiofibular joint - Fibula: sticklike bone w/ expanded ends; articulates tibia (proximal + distal – lateral aspects) bears no weight but muscles originate from o Head: proximal o Lateral malleolus: distal; lateral ankle bulge; articulates talus
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Foot - Tarsus, metatarsus, phalanges (toes) - 2 functions: support weight, lever propel body forward - Tarsus: 7 tarsals
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