Skeletal System Part III

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Presentation transcript:

Skeletal System Part III Mrs. Smith's Health Notes Skull Maxilla Mandible Clavicle Scapula Sternum Ribs Humerus Vertebrae Vertebrae Radius Ulna Pelvic Girdle Pelvic Girdle Carpals Metacarpals Phalanges Femur Patella Tibia Fibula Talus Tarsals Calcaneous Phalanges Metatarsals

Appendicular Skeleton Clavicle: Collar bone  S shaped, frequently broken bone. Scapula: Shoulder blade  Triangular shape, felt in back. Humerus: Upper arm Radius: Lower arm, Thumb side Ulna: Lower arm, Pinkie side, forms the elbow Hand: Wrist: 8 carpals Palm: 5 metacarpals Fingers: 5 phalanges Pelvis: Hips, Sacrum, Coccyx Femur: Thigh bone, Largest, Strongest, Heaviest bone in body Patella: Knee cap Tibia: Shin bone, bears weight Fibula: Thin bone in lower leg Foot: Ankle: 7 tarsals Foot: 5 metatarsals Toes: 5 phalanges Pg. 388

Axial Skeleton Skull: - 22 Irregular bones - Form face & cranium Skull, Spine, Chest -- Protects vital organs Skull: - 22 Irregular bones - Form face & cranium - bones fuse along zigzag lines  SUTURES - Only movable bone MANDIBLE - contains hollow air passages connected to nose & throat SINUSES : Echo chambers to enhance voice Reduce weight of skull Sinus Sinus

Hyoid: - the only bone in the human body that does not attach - U shaped bone (irregular) - Supports tongue - the only bone in the human body that does not attach in any form to any other bone. - suspended by ligaments and muscles. - during autopsy if broken, sign of strangulation. Voice box

Sternum: Breast bone Xiphoid Process: - Flat bone - protects heart - anchor for ribs & diaphragm Xiphoid Process: - Tip of Sternum - Doesn’t OSSIFY until approx. 40 yo. - If CPR is done incorrectly, can be broken

Ribs: 12 pairs All connected to spinal column. Pairs # 1 – 7  TRUE - Pairs # 1 – 7  TRUE Pairs # 8 – 10  FALSE Pairs # 11 – 12  FLOATING Costal Cartilage: Allows for expansion of chest for breathing.

Spinal Column 24 irregular bones: VERTEBRAE Cervical Thoracic Lumbar C1: ATLAS: holds head upright C2: AXIS: head rotates “NO” C3: can be felt back of neck Thoracic Larger & Stronger than cervical Lumbar Largest & Strongest of all vertebrae Major weight bearing region of body

Spinal Column Sacrum: - Triangle shape Coccyx: - Tail bone - 5 fused vertebrae - fusion begins between 16 – 18 YO - completes in mid 20’s Coccyx: - Tail bone - 4 fused bones - fusion occurs between 20 – 30 YO Intervertebral Discs - Pad of cartilage between each vertebrae - act as cushion to absorb force of body weight.

Curves of the Spine Adults: 4 Fetus: 1 Back & forth curves Curves help absorb shock & protect against injury.

Spinal Disorders Scoliosis: lateral curvature of the spine

Spinal Disorders Kyphosis: Hunchback Exaggerated curve in the thoracic region

Spinal Disorders Lordosis: Swayback Exaggerated curve in the Lumbar region