Skeletal System Flashcards
To teach about skeletal system
Bone-resorbing cells that break down bone tissue
Osteoclasts
Bone-building cells that secrete bone matirx
Osteoblasts
Mature bone cells residing in lacunae
Osteocytes
Dense outer layer of bone with fewer pores
Compact Bone
Bone with trabeculae, less dense than compact bone
Spongy Bone
Protective connective tissue sheath around cartilage
Perichondrium
Space occupied by chondrocytes or osteocytes
Lacuna
Bones longer than they are wide, like limbs
Long bones
Bones about as wide as they are long
Short Bones
Thin, flattened bones, often curved
Flat Bones
Bone that do not fit on the other categories
Irregular bones
Regulation of calcium levels in the body
Calcium Homeostasis
Lowers blood calcium by inhibiting osteoclasts
Calcitonin
A _ has 206 bones
Adult skeleton
Includes skull, auditory ossicles, hyoid bone, vertebral column, thoracic cage
Axial skeleton
Examples are vomer, mandible
Unpaired bones
Examples are radius, ulna/tibia, fibula
Paired Bones
Includes upper limbs, lower limbs, girdles
Appendicular skeleton
Provides flexible support and protects the spinal cord
Vertebral Column
Top of the skull
Calvaria
Immovable joints that connect cranial bones
Sutures
Consists of ribs, costal cartilages, and sternum
Thoracic cage
Arm bone that articulates with the scapula, radius, and ulna
Humerus
Formed from the fusion of ilium, ischium, and pubis
Coxal Bones
Bone disorder with excessive breakdown and disorganized formation
Paget Disease
