Skeletal System Flashcards
Types of skeletons
Axial and Appendicular
Axial
80 bones, skull, vertebrae, rib cage, sternum
Appendicular
126 bones, clavicle, scapula, arms, forearms, hands, pelvis, legs, feet, ankles (limbs)
Number of bones in the human body
206 bones
Functions of the Skeletal System
Support and protection, body movement, produces blood cells, storage of minerals and fats
Long Bones
Cylinder-like shape, longer that they are wide (femur, tibia, fibula, etc)
Short Bones
Cube-like shape, length, width, thickness are similar (carpals, tarsals)
Flat Bones
Thin and curved (sternum, ribs, scapula, cranial bones)
Irregular Bones
Complex shape (vertebrae, facial bones)
Sesamoid Bones
Small and round, embedded in tendons (patellae)
Epiphysis
End of the long bone
Diaphysis
Middle (shaft) of the bone
Articular Cartilage
Cartilage at the end of the bone for cushioning/padding
Periosteum
Membrane that covers the entire bone
Medullary Cavity
Hollow chamber in diaphysis filled with bone marrow
Red Bone Marrow
Produces red blood cells
Yellow Bone Marrow
Stores minerals and fats
Compact Bone Tissue
Wall of diaphysis
Spongy Bone Tissue
Sponge look, in the epiphysis, has red marrow
Pivot Joint
uniaxial, allows rotational movement, forearm rotation
Hinge Joint
uniaxial, allows flexion/extension movement, knee, elbow, ankle
Saddle Joint
biaxial,
Condyloid Joint
biaxial
Ball and Socket Joint
multiaxial
Plane Joint
multiaxial
Number of bones in cranium
22 bones
Only moveable bone in cranium
mandible (lower jaw)
Five vertebral regions
Cervical vertebrae, Thoracic Vertebrae, Lumbar Vertebrae, Sacrum, Coccyx
How many vertebrae are in cervical
7, C1-C7
How many vertebrae are in thoracic
12, T1-T12
How many vertebrae are in lumbar
5, L1-L5
Scoliosis
abnormal lateral curvature, and twisting of the vertebral column
Kyphosis
hunchback, excessive posterior curvature of the thoracic region
Lordosis
swayback, excessive anterior curvature of the lumbar region
What does the thoracic cage protect
heart and lungs
Costal cartilage
cartilage that extends several inches
True Ribs
Ribs 1-7, costal cartilage connects them to the sternum
False Ribs
Ribs 8-12, costal cartilage does not directly connect to sternum
Floating Ribs
Ribs 11-12, short ribs that do not attach to sternum at all
Main bones of pectoral girdle
Scapula and clavicle
Humerus
upper arm bone
Radius
larger, outer bone of the forearm
Ulna
smaller, inner bone of the forearm
Carpals
small, ball-like bones in the lower part of the hand near the wrist
Metacarpals
5 middle bones in the hand
Phalanges
finger and toe bones (distal, middle, proximal)
Femur
upper bone of the leg (thigh)
Tibia
larger inner bone of the lower leg
Fibula
smaller outer bone of the lower leg
Tarsals
small bones in the foot near the ankle
Metatarsals
middle bones in the foot
Closed Fracture
if the injury does not break the skin
Open Fracture
if the injury does break the skin
Transverse Fracture
when a bone breaks at a 90-degree angle to the long axis of the bone
Spiral Fracture
occurs when a long bone is broken by a twisting force
Comminuted Fracture
when a bone is broken or splintered into multiple pieces
Impacted Fracture
a break where the ends are driven into each other
Greenstick Fracture
when a bone bends and cracks, but not into separate pieces
Oblique Fracture
when the break is on an angle through the bone