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Anatomy and Physiolgy of the Skeletal System
The functions and structures of the skeletal system
49
Anatomy
Undergraduate 2
11/28/2014

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Term
Skeleton
Definition
supports basic framework and soft tissue, protects internal organs, assists in movement, produces blood cells, stores triglycerides, provides mineral homeostasis
Term
Long Bones
Definition
structure is longer than wide, slightly curved for strength
Term
Long Bones
Definition
femur, tibia, fibula, humerus, ulna, radius, phalanges
Term
Short Bones
Definition
cube-shaped; wrist and ankle bones
Term
Flat Bones
Definition
the protector bones, they are thin and provide surface for muscle attachments
Term
Flat Bones
Definition
cranial, sternum, ribs, scapulae
Term
Irregular Bones
Definition
too complex or odd shaped to place in a group
Term
Irregular Bones
Definition
vertebrae, some of the skull and facial bones
Term
Diaphysis
Definition
the shaft of a long bone; made of compact bone that contains yellow bone marrow
Term
Epiphysis
Definition
distal and proximal ends of a long bone; mostly spongy bone that contains red bone marrow
Term
Metaphysis
Definition
where the diaphysis joins the epiphysis in mature bones
Term
Articular Cartilage
Definition
thin layer of hyaline cartilage that covers epiphysis where a joint is formed with another bone; reduces friction and absorbs shock
Term
Periosteum
Definition
dense irregular ct around bone wherever articular cartilage does not cover; pain sensistive
Term
Periosteum
Definition
allows bone to grow in diameter but not length; provides nourishment to bone, helps repair and provides a place of attachment for ligaments
Term
Bone
Definition
composed of a matrix of 25% water, 25% collagen fibers and 50% crystallized mineral salts
Term
Bone
Definition
hardness comes from the mineral salts crystallizing, flexibility is from collagen fibers
Term
Osteoblasts
Definition
bone-building cells; synthesize and secrete collagen fiber and other materials for matrix building
Term
Osteoblasts
Definition
turn into osteocytes as their surrounding matrix traps them
Term
Osteocytes
Definition
mature bone cells, continually exchange nutrients and wastes with the blood
Term
Osteocytes
Definition
do not undergo cell division
Term
Osteoclasts
Definition
large cell composed of many wbc's that release enzymes and acids to break down bone matrix
Term
Osteoclasts
Definition
responsible for reabsorption, which is part of bone growth, maintenance and repair
Term
Compact Bone Tissue
Definition
makes up 80% of the skeleton; external layer of bones and most of the diaphysis in long bones
Term
Osteons
Definition
units of compact bone tissue; AKA haversion systems
Term
Perforating Canals
Definition
where blood vessels, lymph vessels and nerves penetrate compact bone from periosteum; AKA volkmann's
Term
Central Canals
Definition
run longitudinally through the bone; AKA haversion
Term
Concentric Lamellae
Definition
rings of calcified matrix around canals
Term
Lacunae
Definition
spaces between lamellae that contain osteocytes; AKA little lakes
Term
Canaliculi
Definition
branch out in all directions from lacunae; filled with extracellular fluid; provide many routes for oxygen, nutrients and waste outfloe; AKA little canals
Term
Spongy Bone Tissue
Definition
makes up 20% of the skeleton;does not contain osteons; present in most short flat and irregular bones
Term
Spongy Bone Tissue
Definition
forms most of epiphysis of long bones; contain trabeculae
Term
Trabeculae
Definition
latticework of bone that makes up spongy bone; spaces between are filled with red bone marrow
Term
Remodeling
Definition
the process where old bone is continually being replaced with new bone tissue
Term
Remodeling
Definition
AKA Wolff's Law- bone remodels to stress
Term
Calcium Homeostasis
Definition
bone stores 99% of body's calcium and is released during remodeling; calcium levels can be dangerous if too high or low
Term
Demineralization
Definition
the loss of bone minerals through the absence of mechanical stress on the bone
Term
Gravity
Definition
the main pull of stress on our bones; astronauts lose as much as 1% of bone mass a week
Term
Foramen
Definition
opening for blood vessels, nerves and ligaments to pass through
Term
Meatus
Definition
tubelike channel extending within the bone
Term
Fossa
Definition
shallow depression in or on the bone
Term
Condyle
Definition
large rounded prominence that forms a joint
Term
Head
Definition
round projection that forms a joint; supported on constricted portion of a bone
Term
Facet
Definition
smooth, flat articular surface
Term
Tuberosity
Definition
large, rounded projection usually with a rough surface
Term
Spineous Process
Definition
sharp slender projection; AKA spine
Term
Trochanter
Definition
large, blunt projection found only on femur
Term
Crest
Definition
prominent border or ridge
Term
Male Pelvis
Definition
smaller pubic opening and heart shaped
Term
Female Pelvis
Definition
shallower and more oval shaped
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