Dr. Michael P. Gillespie. The adult human skeleton consists of 206 named bones. Infants have more...
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Transcript of Dr. Michael P. Gillespie. The adult human skeleton consists of 206 named bones. Infants have more...
Dr. Michael P. Gillespie
The adult human skeleton consists of 206 named bones.Infants have more bones because not all bones have fused.Axial skeleton 80 bonesLongitudinal axis (center of the body)Bones arranged along the axis: skull bones, auditory ossicles, hyoid bone, ribs, breastbone, and backboneAppendicular skeleton 126 bonesUpper and lower limbs (extremities), girdles (connect limbs to axial skeleton)
SkullCranium8Face14Hyoid1Auditory Ossicles6Vertebral Column26ThoraxSternum1Ribs24Total80
Pectoral (Shoulder) girdlesClavicle2Scapula2Upper limbs (extremities)Humerus2Ulna2Radius2Carpals16Metacarpals10Phalanges28
Pelvic (hip) girdleHip, pelvic, or coxal bones2Lower limbs (extremities)Femur2Fibula2Tibia2Patella2Tarsals14Metatarsals10Phalanges28Total126
Long BonesShort BonesFlat BonesIrregular BonesSesamoid BonesSutural
Depressions and OpeningsSites allowing the passage of soft tissue (nerves, blood vessels, ligaments, tendons) or formation of joints.ProcessesProjections or outgrowths on bone that form joints or attachment points for connective tissue, such as ligaments and tendons).
Fissure narrow slitForamen opening (hole)Fossa shallow depression (trench)Sulcus furrow (groove)Meatus tubelike opening (passageway)
Processes that form jointsCondyle Large, round protuberance at the end of a bone (knuckle)Facet smooth, flat articular surfaceHead rounded articular projection supported on the neck of a bone
Processes that form attachment pointsCrest prominent ridge or elongated projectionEpicondyle projection above a condyleLine long narrow ridge or borderSpinous process sharp, slender projectionTrochanter very large projectionTubercle small, rounded projectionTuberosity large, rounded projection
Carotid Hypoglossal Infraorbital Jugular Lacerum Magnum Mandibular
Membrane-filles spaces between the cranial bonessoft spotsAllow the skull to change shape as it passes through the birth canal
Anterior fontanelBetween the parietal bones and the frontal bonePosterior fontanelBetween the parietal bones and the occipital boneAnterolateral fontanelsBetween the frontal, parietal, temporal, and sphenoid bonesPosterolateral fontanelsBetween the parietal, occipital, and temporal bones
Kyphosis exaggeration of the thoracic curveLordosis an exaggeration of the lumbar curve or cervical curveLumbar spine stenosis narrowing of the spinal canalScoliosis lateral bending of the vertebral column