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Skeletal System
Structures and Characteristics of Bone and Some Structures of the Skull
54
Anatomy
Undergraduate 1
02/02/2012

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Term
long bone
Definition
bone that has 2 big ends and a shaft in between, ex: femur
Term
short bone
Definition
bone that is cube shaped, ex: bones in the wrist
Term
flat bone
Definition
bone that is thin, flattened and somewhat curved; ex: sternum, scapula, ribs, most of cranial bones
Term
irregular bones
Definition
bone that does not have a distinct shape, ex: vertebrae, pelvis
Term
sesamoid bone (type of short bone)
Definition
bone that develops inside a tendon, ex: patella
Term
sutural bone (type of irregular bone)
Definition
bone forming a bone to bone junction, ex: bones in the cranial sutures
Term
diaphysis
Definition
shaft of bone
Term
epiphyseal line
Definition
line which is the point of growth in the epiphysis of a long bone of an adult
Term
epiphyseal cartilage
Definition
line which is the point of growth in the epiphysis of a long bone of juvenile
Term
epiphysis
Definition
the end of a long bone
Term
articular cartilage
Definition
all cartilage on epiphysis
Term
periosteum
Definition
outer covering on diaphysis
Term
spongy bone
Definition
porous, soft bone found mostly in epiphysis
Term
compact bone
Definition
hard, dense bone found mostly in diaphysis
Term
medullary cavity
Definition
cavity in diaphysis where bone marrow is located
Term
red marrow
Definition
fills up spongy bone
Term
yellow marrow
Definition
fulls up medullary cavity
Term
tuberosity
Definition
large rounded projection, point of muscle or ligament attachment
Term
crest
Definition
prominent ridge, point of muscle or ligament attachment
Term
trochanter
Definition
large, blunt, rough, projection, point of muscle or ligament attachment
Term
tubercle
Definition
small, rounded projection, point of muscle or ligament attachment
Term
epicondyle
Definition
raised area on or above condyle, point of muscle or ligament attachment
Term
line
Definition
a low ridge, less prominent than a ridge, point of muscle or ligament attachment
Term
process
Definition
any boney prominence, point of muscle or ligament attachment
Term
spine
Definition
sharp, slender, or pointed process, point of muscle or ligament attachment
Term
head
Definition
expanded articular end of an epiphysis, part of a joint
Term
facet
Definition
small, flat articular surface, part of a joint
Term
condyle
Definition
rounded projection at the end of a bone, part of a joint
Term
ramus
Definition
extension of bone making an angle to the rest of the structure, part of a joint
Term
fossa
Definition
shallow depression, part of a joint
Term
foramen
Definition
rounded passageway for vessels and/or nerves
Term
meatus
Definition
canal leading through the bone, path for vessel or nerve
Term
fissure
Definition
elongated cleft (narrow slit like opening), path for vessel or nerve
Term
groove
Definition
furrow, path for vessel or nerve
Term
sinus
Definition
a narrow groove, path for vessel or nerve
Term
central (Haversian) canal
Definition
middle of osteon, contains blood vessels
Term
osteon or Haversian system
Definition
basic structural and functional unit of compact bone
Term
lamella(e)
Definition
concentric layers of boney matrix surrounding central canal
Term
lacuna(e)
Definition
groves found between layers of lamella where osteocytes are found
Term
osteocyte
Definition
bone forming cells found in lacuna
Term
canaliculus (canaliculi)
Definition
narrow grooves connecting lacuna
Term
perforating (Volkmann's) canal
Definition
connects 2 central canals
Term
axial skeleton
Definition
skeleton of the head and trunk, consists of the bones of the skull, thorax, and vertebral column
Term
skull
Definition
composed of the cranium and facial bones
Term
cranium
Definition
formed by 6 flat bones that form dome-shaped clavaria or cranial vault, and 2 irregular bones that help form the cranial base or floor
Term
cranial fossa
Definition
three "shelves" in the cranium; anterior, middle, and posterior
Term
anterior fossa
Definition
anterior "shelf" formed by frontal bone, ethmoid bone, and lesser wings of the sphenoid bone, and contains the frontal lobe of cerebrum
Term
middle fossa
Definition
middle "shelf" formed by the temporal, parietal, and sphenoid bones; contains temporal lobes and the anterior portion of the brain stem
Term
posterior fossa
Definition
posterior "shelf" formed by the occipital bone, contains, cerebellum, occipital lobes of cerebrum, and posterior portion of the brain stem
Term
orbits
Definition
bony cavities that house the eyes and associated muscles, blood vessels, and nerves
Term
bones forming roof of orbit
Definition
frontal bone and lesser wings of the sphenoid (form this part of the orbit)
Term
bones forming medial wall of the orbit
Definition
sphenoid, ethmoid, maxilla, and lacrimal bones (form this part of the orbit)
Term
bones forming lateral wall of the orbit
Definition
zygomatic, frontal, and sphenoid bones (form this part of the orbit)
Term
bones forming floor of the orbit
Definition
maxilla, palatine, and zygomatic bones (form this part of the orbit)
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