Presentation on theme: "Regions of the Human Skeleton"— Presentation transcript:
1Regions of the Human Skeleton Axial skeleton:skull (cranium and facial bones)hyoid bone (anchors tongue and musclesassociated with swallowing)vertebral column (vertebrae and disks)bony thorax (ribs and sternum)Appendicular skeleton:pectoral girdle (clavicles and scapulae)upper limbs (arms)pelvic girdle (sacrum, coccyx)lower limbs (legs)Articulation- where joints meet, connect, and are formed.
2206 Bones in a Human Adult Skeleton 22 bones in skull6 in middle ears1 hyoid bone26 in vertebral column25 in thoracic cage4 in pectoral girdle60 in upper limbs60 in lower limbs2 in pelvic girdle
3The Axial Skeleton Forms the longitudinal part of the body Divided into three partsSkullVertebral columnBony thoraxSlide 5.20a
9The Fetal Skull: Superior View (10.9) Skull bones are still incompleteFontanels (“little fountain”):Unossified remnants of fibrous membranesPulse can be felt surging in these “soft spots”Allow infants head to be compressed slightly during birthAccommodate brain growth in fetus & infantAnterior fontanel remains soft until 1.5-2yrs of ageOthers are replaced by bone by the end of the first year
11Paranasal Sinuses (10.6)Mucus lined, hollow, air-filled portions of bones surrounding the nasal cavityMucoase of sinus help to warm and humidify inspired air
12The Hyoid BoneThe only bone that does not articulate with another boneAnchored by narrow stylohyoid ligaments to syloid process of temporal bone.Serves as a moveable base for the tongueFigure 5.12
13The Vertebral Column Vertebrae separated by intervertebral discs Spine has a normal curvatureVertebrae vary in size and morphologyEach vertebrae named according to location:7 cervical vertebrae12 thoracic5 lumbar1 sacrum (5 fused)1 coccyx (4 fused)