Flashcards in OSTEOLOGY- Cells, matrix, ossification, bone density, bone variation Deck (35)
What are the four basic tissues of the human body?
epithelial, muscle, neural, and connective tissue
What is osteology?
the study of bone
What are the three primary cell types of bone?
osteoblasts, osteocytes, and osteoclasts
What is the function of each type of bone cell?
osteoblast - form bone
osteocyte - maintain or nurture bone
osteoclast - remodel bone
What are the bone cells embedded in?
an amorphous matrix consisting of ground substance, protein fibers and various minerals
What is the primary constituent of the ground substance?
What types of glycosaminoglycans predominant in bone?
chondroitin sulfates, keratin sulfates, and hyaluronic acid
What is the principal type of protein fiber in bone?
collagen type 1
What are the primary constituents of the bone mineral?
calcium, phosphate, citrate and carbonate ions
what is the most frequently described deposit in bone?
Bone is also the repository for what additional ions?
sodium, magnesium, fluoride, lead, strontium and radium
What is Wolff's Law as it pertains to bone?
living tissue will respond to stressors; bone is formed or absorbed in response to various stressors
What three responses of "living" bone were stressed in class?
it has the ability to heal, to remodel under stressors, and to age
Bone is the embryological derivative of which specific connective tissues?
mesenchyme and/or cartilage
What is the name given to the pattern of ossification in mesenchyme?
What is the timing for the appearance of intramembranous ossification?
from the second to third month in utero
hat part of the axial skeleton is primarily formed by intramembranous ossification?
which of the skull bones are derived from intramembranous ossification?
the nasal, palatine, vomer, lacrimal, zygomatic, maxilla, frontal, parietal, most of the mandible, the squama of the temporal and occipital bones and the greater wing of the sphenoid
Which bone of the appendicular skeleton is partially formed by intramembranous ossification?
What is the name given to the pattern of ossification in cartilage?
What is the timing for the appearance of ossification in cartilage?
from the second to fifth month in utero
What part of the skull is derived from endochondral ossification?
What bones are formed from the chondrocranium?
the inferior nasal concha, ethmoid, and the remainder of the mandible, sphenoid, temporal, and occipital bones
Which skull bones are ossified by both endochondral and intramembranous ossification?
the mandible, sphenoid, temporal and occipital bones
which bone of the appendicular skeleton is formed by both endochondral and intramembranous ossification?
What are the names given to the centers of ossification based on time of appearance?
primary centers of ossification appear before birth
secondary centers of ossification appear after birth
Mature bone is described as being composed of what areas based on bone density?
cortical or compact bone and spongy, cancellous, or trabecular bone
What is the name given to the bone below an articulating surface?
What is the name of the outer fibro-cellular covering of bone?