7.2 – Histology of osseous tissue Flashcards
where do you find osteogenic cells?
endosteum and periosteum
T or F:
the bone cells responsible for the formation of the organic bone matrix are called chondrocytes
F
osteoblasts are responsible for formation of organic bone matrix. They deposit bone matrix and eventually become osteocytes
(chondrocytes produce and maintain the cartilaginous matrix.)
what describes the lacunae of osseous tissue?
spaces b/n lamellae that contain osteocytes
the central canal is…
the hollow canal in the center of the osteon
caniculi are the…
tiny canals radiating from the lacunae
what are mature bone cells found w/in lacunae of compact bone called?
osteocytes
the stem cells that form osteoblasts are the ___
osteogenic cells
T or F:
osteocytes and osteoclasts develop from the same type of stem cell
F
(osteogenic cells, osteoblasts, and osteocytes all belong to one cell lineage, but osteoclasts have an independent origin)
osteoblasts secretes the hormone ___
osteocalcin
what is the hollow space in which an osteocyte resides called?
lacuna
canaliculus (what is it)
narrow channel connecting neighboring lacunae
perforating canal (what is it)
connects central canals of 2 neighboring osteons
central canal (what is it)
single large opening at the center of an osteon
layers of bony matrix arranged around the central canal of an osteon are called ___ lamellae
concentric
which layer of tissue lines the internal surfaces of a bone?
endosteum
the periosteum covers the…
outer surface of a bone
the perichondrium is…
a layer of dense irregular connective tissue which surrounds cartilage
the basic structural unit of compact bone is the ___
osteon
osteocytes are former ___
osteoblasts
trabeculae and spicules are found in ___ bone
spongy
the action carried out by osteoclasts is ___
osteolylsis
hydroxyapatite makes up part of which component of the bony matrix?
inorganic
hydroxyapatite is a calcium phosphate salt and is therefore inorganic (mineral)
bone marrow fills the space b/n trabeculae in ___ bone tissue
spongy
lacunae are located b/n concentric rings of compact bone tissue called what?
lamellae
interstitial lamella are…
fragments of old Haversian systems found b/n enact osteons
osteons are…
the basic structural units of compact bone, consisting of a central canal and its lamellae
canaliculi are…
slender channels connecting neighboring lacunae
osteocytes are…
former osteoblasts that have become trapped in the matrix they deposited, thus residing in the lacunae
in adults, which bone marrow is limited to the axial skeleton, pectoral and pelvic girdles, and proximal heads of the humerus and femur?
red
most of the marrow in the adult turns to yellow bone marrow, but red bone marrow remains in the axial skeleton, pectoral and pelvic girdles, and the epiphyses of the humerus and femur
in longitudinal views, osteons are ___
cylinders
what is the function of red bone marrow?
blood cell production
what are the thin plates forming spongy bone called?
trabeculae
T or F:
osteocytes and osteoclasts develop from the same type of stem cell
false
(osteogenic cells, osteoblasts, and osteocytes all belong to one cell lineage, but osteoclasts have an independent origin)
which of the following is a function of yellow bone marrow?
storage of energy
(yellow bone marrow is a storage location of adipose cells, which store energy)
what are the spaces b/n trabeculae in spongy bone filled with?
bone marrow
(red marrow is found in the spongy bone of the epiphysis of a long bone, whereas yellow marrow is found in the medullary (marrow) cavity of the diaphysis)
during intramembranous ossification, bone matrix is deposited by which type of cells?
osteoblasts
where is red bone marrow found in the bones of a child?
almost all bones
in which of the following does blood cell production occur?
red bone marrow
fatty bone marrow that no longer produces blood cells is called ___ bone marrow
yellow
