Chapter 1: Introduction to the Skeleton and the Bony Pelvis Flashcards
________ - is composed of several different tissues working together: bone or osseous tissue, cartilage, dense connective tissues, epithelium, adipose tissue, and nervous tissue.
Bone
The framework of bones and their cartilages, along with ligaments and tendons.
skeletal system
The study of bone structure and the treatment of bone disorders is called:
osteology
What are the basic functions of the skeletal system?
- Support
- Protection
- Assistance in movement
- Mineral homeostasis (storage and release )
- Blood cell production
- Triglyceride storage.
Bone that has greater length than width.
long bone
A typical long bone consists of the following parts. Except:
- diaphysis
- epiphyses
- Exosteum
- articular cartilage
- periosteum
- medullary cavity
- endosteum
Except: 3
__________ - is a thin layer of hyaline cartilage covering the part of the epiphysis where the bone forms an articulation (joint) with another bone.
articular cartilage
the cartilage in the epiphyseal plate is replaced by bone; the resulting bony structure is known as:
the epiphyseal line
_________ - is a tough connective tissue sheath and its associated blood supply that surrounds the bone surface wherever it is not covered by articular cartilage.
periosteum
________ - is the bone’s shaft or body—the long, cylindrical, main portion of the bone.
diaphysis
________ - is a hollow, cylindrical space within the diaphysis that contains fatty yellow bone marrow and numerous blood vessels in adults.
medullary cavity
_______ - is a thin membrane that lines the medullary cavity.
endosteum
The following are Functions of bone tissue. Except:
- Supports soft tissue and provides attachment for skeletal muscles.
- Protects internal organs.
- Assists in movement, along with skeletal muscles.
- Stores and and produces minerals.
- Contains red bone marrow, which produces blood cells.
- Contains yellow bone marrow, which stores triglycerides (fats).
Except: 4
Muscle resistance to being stretched or torn apart.
tensile strength
What are the four types of cells present in bone tissue?
- Osteogenic cells
- Osteoblasts
- Osteocytes
- Osteoclasts
__________ - are unspecialized bone stem cells derived from mesenchyme, the tissue from which almost all connective tissues are formed.
Osteogenic cells
_______- are bone-building cells.
Osteoblasts
________ - mature bone cells, are the main cells in bone tissue and maintain its daily metabolism.
Osteocytes
________ - are huge cells derived from the fusion of as many as 50 monocytes and are concentrated in the endosteum.
Osteoclasts
True or False:
A mnemonic that will help you remember the difference between the function of osteoblasts and osteoclasts is as follows:
osteoBlasts Build bone, while osteoClasts Carve out bone.
True
__________ - contains few spacesand is the strongest form of bone tissue. It is found beneath the periosteum of all bones and makes up the bulk of the diaphyses of long bones. Provides protection and support and resists the stresses produced by weight and movement.
Compact bone tissue
_________ - small spaces in the concentric lamellae which contain osteocytes.
lacunae
The areas between neighboring osteons contain lamellae called:
interstitial lamellae
Arranged around the entire outer and inner circumference of the shaft of a long bone are lamellae called:
circumferential lamellae
The circumferential lamellae that line the medullary cavity are called:
inner circumferential lamellae
__________ - Tissue that is always located in the interior of a bone, protected by a covering of compact bone. Spongy bone tissue makes up most of the interior bone tissue of short, flat, sesamoid, and irregularly shaped bones.
Spongy bone tissue
________ - is a diagnostic procedure that takes advantage of the fact that bone is living tissue. A small amount of a radioactive tracer compound that is readily absorbed by bone is injected intravenously.
bone scan
__________ - small arteries accompanied by nerves, enter the diaphysis through many perforating canals and supply the periosteum and outer part of the compact bone.
Periosteal arteries
The process by which bone forms.
ossification
Veins that carry blood away from long bones are evident in three places: Which of the following is true?
(1) One or two nutrient veins accompany the nutrient artery and exit through the epiphyses .
(2) numerous epiphyseal veins and metaphyseal veins accompany their respective arteries and exit through the diaphysis.
(3) many small periosteal veins accompany their respective arteries and exit through the periosteum.
3
What are the four principal situations that Bone formation occurs?
- the initial formation of bones in an embryo and fetus.
- the growth of bones during infancy, childhood, and adolescence until their adult sizes are reached.
- the remodeling of bone
- the repair of fractures throughout life.
What are the two methods of bone formation?
- Intramembranous Ossification
- Endochondral Ossification
The flat bones of the skull, most of the facial bones, mandible (lower jawbone), and the medial part of the clavicle (collar bone) are formed.
Intramembranous Ossification
The replacement of cartilage by bone is called:
endochondral ossification
The growth in length of long bones involves the following two major events: true or false:
(1) interstitial growth of cartilage on the epiphyseal
side of the epiphyseal plate.
(2) Replacement of cartilage on the diaphyseal side of the epiphyseal plate with bone by endochondral
ossification.
True
________ - is a layer of hyaline cartilage in the metaphysis of a growing bone that consists of four
zones.
epiphyseal plate
This layer is nearest the epiphysis and consists of small, scattered chondrocytes. the cells do not function in bone growth.
Zone of resting cartilage
Slightly larger chondrocytes in this zone are arranged like stacks of coins. The chondrocytes in this zone divide to replace those that die at the diaphyseal side of the epiphyseal plate.
Zone of proliferating cartilage
This layer consists of large, maturing chondrocytes arranged in columns.
Zone of hypertrophic cartilage
The final zone of the epiphyseal plate is only a few cells thick and consists mostly of chondrocytes that are dead because the extracellular matrix around them has calcified.
Zone of calcified cartilage