The four classes of bone according to shape are
long, short, flat, and irregular.
Examples of long bones are
forearm and thigh bones.
Short bones are shaped like
Examples of short bones are
wrist bones (carpals)
ankle bones (tarsals)
Flat bones are ______structures
Two typical characteristics of flat bones
they are thin and usually curved
Examples of flat bones are
most skull bones,
breast bone = sternum,
shoulder blades = scapulae,
Irregular bones have a variety of
Irregular bones are not long, short, or flat
Examples of irregular bones are
vertebrae and some facial bones
Round bones are also called
Sesamoid bones are ______(describe)____ and __________ and embedded in
Sesamoid bones are small and nodular and embedded in tendons
An example of a sesamoid bone is the
Parts of a Long Bone
An expanded end of a long bone is an
Epiphyseal Line- Growth plate
An epiphysis articulates with
An epiphysis articulates with another bone
Articular cartilage is located
on an epiphysis.
The shaft of a long bone is called a
Name two characteristics of the shaft (or diaphysis) of a long bone
consists of a central medullary cavity (filled with yellow marrow)
surrounded by a thick collar of compact bone.
is a tough, vascular, fibrous membrane covering the diaphysis of a bone.
Periosteum- outer lining of bone
Periosteum functions to
form and repair bone tissue
Processes provide sites for
for attachments of tendons or ligaments
The wall of the diaphysis is composed of______bone
Compact bone- makes up diaphysis
Compact bone has a continuous....
matrix with no gaps
The epiphyses are largely composed of__________bone
Spongy bone consists of bony plates called
Spongy bone- contains red bone marrow
A bone usually has these two types......
compact bone and spongy bone.
A canal called______runs through the diaphysis
Endosteum provides lining for what structures?
the medullary cavity and spaces of spongy bone
Medullary Cavity- contains yellow bone marrow in adults
Endosteum contains what kind of cells?
Endosteum- lines medullary cavity
The tissue that fills the spaces of bone is called
The two forms of marrow are
red and yellow.
Name the parts of a long bone....
Diaphysis = shaft
Epiphyses (pl) = expanded ends.
Epiphyseal line = remnant of epiphyseal disk/plate
Periosteum = outer, fibrous, protective covering of diaphysis
Endosteum = inner lining of medullary cavity.
Articular cartilage = pad of hyaline cartilage on the epiphyses where long bones articulate or join.
Bone cells are called
What are Lacunae ?
Lacunae are tiny, chambers that contain osteocytes
Lacunae form___________ canals around
concentric canals around central canals
Osteoctyes transport what?
Osteoctyes transport nutrients and wastes to and from nearby cells.
Cellular processes of osteocytes pass through
The intercellular matrix of bone is composed of
collagen and inorganic salts.
What is an osteon?
a cylinder-shaped unit of compact bone
What forms the substance of compact bone?
many osteons cemented together.
Each central canal contains what two things?
blood vessels and nerves
What do perforating canals connect?
Perforating canals contain what 2 things?
larger blood vessels and nerves.