Chapter 3 Flashcards
The Skeletal System
What are the 8 main structures of the skeletal system?
bones, bone marrow, cartilage, joints, ligaments, synovial membranes, synovial fluid, bursae
The process of bone formation
ossification
What is the function of osteoclasts?
to break down old or damaged bone
What is the function of osteoblasts?
to rebuild bone
What type of tissue makes up bone?
connective tissue
oste
bone
peri-
surrounding
-um
noun ending
The tough, fibrous tissue that forms the outermost covering of bone
Periosteum
The dense, hard, and very strong bone that forms the protective outer layer of bones.
Compact bone (aka cortical bone)
The porous part of bone found in the ends and inner portions of long bones as well as in the pelvic bones, ribs, and vertebrae of the spinal column
Spongy bone (aka cancellous bone)
Where is red bone marrow often located?
spongy bone
Name 2 examples of long bones
Femur, humerus
The central cavity located in the shaft of long bones, where it is surrounded by compact bone.
the medullary cavity
Where is red and yellow bone marrow stored?
the medullary cavity
What does medullary mean?
pertaining to the inner section
end-
within
The tissue that lines the medullary cavity
the endosteum
What does hemopoietic mean? (aka hematopoietic)
pertaining to the formation of red blood cells
hem/o
blood
-poietic
pertaining to the formation
A hemopoietic tissue that makes red blood cells, hemoglobin, white blood cells, and thrombocytes
red bone marrow
A fat storage area
yellow bone marrow
The smooth, rubbery, blue-white connective tissue that acts as a shock absorber between bones and makes up flexible parts of the skeleton
cartilage
Definition of articulate
come together
This covers the surfaces of bones where they come together to make smooth joint movement possible and protects the bones from rubbing against each other
Articular cartilage
The curved, fibrous cartilage found in some joints such as the knee and temporomandibular joint of the jaw
the meniscus
The shaft of a long bone
diaphysis
The wider ends of long bones
epiphyses
The end of the bone located nearest to the midline of the body
proximal epiphysis
The end of the bone located farthest away from the midine of the body
distal epiphysis
An opening in a bone through which blood vessels, nerves, and ligaments pass
foramen
The spinal cord passes through the ___________ of the occipital bone at the base of the skull
foramen magnum
A normal projection on the surface of a bone that most commonly serves as an attachment for a muscle or tendon
process
The bony projection located on the temporal bones just behind the ears
mastoid process
The place of union between 2 or more bones
joints (aka articulations)
3 types of joints
fibrous, cartilaginous, synovial
Consisting of inflexible layers of dense connective tissue, these hold the bones tightly together
fibrous joints (aka sutures)
The flexible soft spots that allow the passage of an infant through the birth canal
fontanelles (aka soft spots)
What type of tissue are fontanelles?
fibrous joints
These types of joints allow only slight movement and consist of bones connected entirely by cartilage
cartilaginous joints
The cartilaginous joint, located in the pelvis, allows some movement to facilitate childbirth
pubic symphysis
Type of joint created where 2 bones articulate to permit a variety of motions
synovial joint
2 types of synovial joints and the difference between the two
BALL-AND-SOCKET joints (hips and shoulders) allow wide range of movement in many directions while HINGE joints allow movement primarily in one direction or plane
The 5 components of synovial joints
synovial capsule, synovial membrane, synovial fluid, ligaments, bursae
The outermost layer of strong fibrous tissue that resembles a sleeve as it surrounds the joint
synovial capsule
This lines the synovial capsule and secretes synovial fluid
synovial membrane
Acts as a lubricant to make the smooth movement of a joint possible
synovial fluid
Bands of fibrous tissue that form joints by connecting one bone to another bone or by joining a bone to cartilage
ligaments
A fibrous sac that acts as a cushion to ease movement in areas that are subject to friction
bursa
The skeleton is divided into what two skeletal systems for descriptive purposes?
Axial Skeleton, Appendicular Skeleton
What does the axial skeleton protect?
The major organs of the nervous, respiratory, and circulatory systems
What does the appendicular skeleton protect?
the organs of digestion, excretion, and reproduction
What are the 2 parts of the appendicular sketeton?
The upper and lower extremities
What does the skull consist of?
Cranium bones (8), face bones (14), middle ear (6)
crani
skull
What is made up of 8 bones and protects the brain?
the cranium
The anterior portion of the cranium that forms the forehead.
frontal bone
2 of the largest bones of the skull the form most of the roof and upper sides of the cranium
parietal bones
Forms the back part of the skull and base of the cranium
occipital bone
Form the sides and base of the cranium
temporal bones
Define meatus
the external opening of a canal
The opening of the external auditory canal of the outer ear
external auditory meatus
This , wedge -shaped bone at the base of the skull makes contact with all the other cranial bones
sphenoid bone
Light, spongy bone located at the rood and sides of the nose
ethmoid bone
orbit
the bony socket that surrounds and protects each eyeball
What are the smallest bones in the human body and where are they located?
the auditory ossicles located in the middle ear
What are the names of the 3 auditory ossicles?
malleus, incus, and stapes
Form the upper part of the bridge of the nose
nasal bones
AKA cheekbones, articulate with frontal bone
zygomatic bones
form most of the upper jaw
maxillary bones (aka maxillae or maxilla-singular)
Form the anterior part of the hard palate of the mouth and floor of the nose
palatine bones
Make up part of the orbit at the inner angle
lacrimal bones
Thin, scroll-like bones that form part of the interior of the nose
interior conchae
Nasal septum
the cartilage wall that divides the 2 nasal cavities
Forms the base for the nasal septum
the Vomer bone
The only movable bone of the skull
mandible (aka jawbone)
How is the mandile attached to the skull?
the temporomandibular joint
The bony structure that protects the heart and lungs
the thoracic cavity aka ribcage
Costals
ribs
How many ribs are there?
12 pairs
The 1st seven pairs of ribs that attach anteriorly to the sternum
true ribs
Ribs 8-10 that anteriorly to cartilage that connects them to the sternum
false ribs
Ribs 11 & 12 that are only attached posteriorly to the vertebrae
floating ribs
The 3 parts of the sternum (breastbone)
manubrium, body, xiphoid process
The shoulders form the ______ which supports the arms and hands.
pectoral girdle (aka shoulder girdle)
A slender bone that connects the manubrium to the scapula
clavicle (aka collar bone)
aka shoulder blade
scapula
The extension of the scapula that forms the high point of the shoulder
acromion
The bone of the upper arm
humerus
The smaller and shorter bone of the forearm that runs up the thumb side.
Radius (“rad man”)
The larger and longer bone of the forearm that forms part of the elbow joint
ulna
The funny bone
the olecranon process
The bones that form the wrist
carpals (8)
The carpals form this where nerves and tendons pass through
carpal tunnel
The 5 bones that form the palms of the hand
metacarpals
The 14 bones of the fingers/toes
phalanges
the 3 parts of the four fingers (in to out)
proximal phalanx, middle phalanx, distal phalanx
the 2 parts of the thumb (in to out)
Proximal phalanx, distal phalanx
This protects the spinal cord and supports the head and body
the spinal column (aka vertebral column)
How many vertebrae make up the spinal cord?
26
The solid anterior portion of the vertebra
the boy of the vertebra
The posterior portion of the vertebra
lamina (plural laminae)
The opening in the middle of the vertebra that allows the spinal cord to pass through.
vertebral foramen
These are made of cartilage and separate and cushion the vertebrae from each other
intervertebral disks
The 5 types of vertebrae and their respective numbers
Cervical (C1-C7), Thoracic (T1-T12), Lumbar (L1-L5), Sacrum, Coccyx
What protects the internal organs, supports the lower extremities, and contacts the sacrum, coccyx, and pelvic girdle?
the pelvis