Skeletal Tissue Flashcards
Fossa
A depression, often an articular surface
Endochondral Ossification
Embryonic formation of bone by the replacement of calcified cartilage; most skeletal bones are formed by this process
Hemorrhage
Loss of blood from the vessels by flow through rupture walls; bleeding
Osteon
System of interconnecting canals in the microscopic structure of adult compact bone; unit of bone; also called Haversian system
Parathyroid Gland
Small endocrine glands located on the posterior aspect of the thyroid gland
Epiphyseal plate
Plate of hyaline cartilage at he junction of the diaphysis and epiphysis that provides for growth in length of a long bone
Spongy Bone
Internal layer of skeletal bone. Also called cancellous bone
Appostitional growth
Growth accomplished by the addition of new layers onto those previously formed
Hyaline Cartilage
The most abundant cartilage type in the body; provides firm support with some pliability
Cartilage
One of four types of connective tissue- avascular and not innervated
Articulation (joint)
The junction of two or more bones
Osteomalacia
Disorder in which bones are inadequately mineralized; soft bones
Dipole
The internal layer of spongy bone in flat bones
Parathyroid hormone (PTH)
Hormone released by the parathyroid glands that regulate blood calcium levels
Central (Haversian) canal
The canal in the center of each osteon that contains minute blood vessels and nerve fibers that serve the needs of the osteocytes
Interstitial Lamellae
Incomplete lamellae that lie between intact osteons, filling the gaps between forming osteons, or representing the remnants of an osteon that has been cut through by bone remondling
Osteoblasts
Bone-forming cells
Bone remodeling
Process involving bone formation and destruction in response to hormonal and mechanical factors
T cells
Lymphocytes that mediate cellular immunity; include helper, cytotoxic, regulatory, and memory cells. Also called T Lymphocytes
Cartilage bone (endochondral bone)
Bone forming by using hyaline cartilage structures as models for ossification
Osteogenesis
The process of bone formation; Also called ossification
Osteoclast
Large cells that resorb or break down bone matrix
Foramen
Hole or opening in a bone or between body cavities
Lacuna
A small space, cavity, or depression; lacunae in bone or cartilage are occupied by cells
Fiber
A slender threadlike structure or filament.
Osteoporosis
Decreased density and strength of bone resulting from a gradual decrease in rate of bone formation
Fracture
A break in a bone
Periosteum
Double-layered connective tissue that covers and nourishes the bone
Lamella
A layer, such as of bone matrix is an osteon of compact bone
Hematoma
Mass of clotted blood that forms at an injured site
Diaphysis
Elongated shaft of a long bone
Elastic Cartilage
Cartilage with abundant elastic fibers; more flexible than hyaline cartilage
Paget’s Disease
Disorder characterized by excessive bone breakdown and abnormal bone formation
Trabecula
Any of the fibrous bands extending from the capsule into the interior of an organ; strut or thin plate of bone in spongy bone
Appendiular
Relating to the limbs; one of the two major divisions of the body
Calcitonin
Hormone released by the thyroid. Lowers blood calcium levels only when present at high levels
Congenital
Existing at birth
Callus
Localized thickening of skin epidermis resulting from physical trauma; repair tissue formed at a fracture site
Pelvis
Basin-shaped bony structure composed of the pelvis girdle, sacrum, and coccyx; funnel-shaped tube within the kidney continuous with the uteter
Bone resorption
The removal of osseous tissue; part of the continuous bone remodeling process
Sesamoid bones
Short bone embedded in tendons, variable in size and number, many of which influence the action of muscles; largest is the patella
Perforating canals
Canals that run at right angles to the long axis of the bone, connecting the vascular and nerve supplies of the periosteum to those of the central canals and medullary cavity; also called Volkmann’s canals
Endosteum
Connective tissue membrane covering internal bone surfaces
Osteoid
Unmineralized bone matrix