Bone - Mace (Exam 2) Flashcards
What are the types of supporting cartilages?
- Hyaline
- Fibrocartilage
- Elastic
What are the types of bones (osseous CT)?
- Compact bone tissue
- Spongy bone tissue
What cartilage is made of dense regular CT and anchors bone to bone?
Ligaments (think about the “I” as looking like a bone to help remember bone-to-bone)
What cartilage is made of dense regular CT and anchors muscle to bone?
Tendons
Cartilage is composed of semi-rigid connective tissue that is ___ (more/less) flexible than bone
more
Cartilage contains a semisolid matrix. What is it composed of?
Ground substance, collagen, and elastic fibers, but NO calcium salt
What component of cartilage produces matrix and surrounds themselves until they become trapped in little cavities (lacunae)?
Chondroblasts
Once chondroblasts are enclosed in lacunae, what do they become?
Chondrocytes
B (blasts) comes before C (cytes)
What component of cartilage is a sheath of dense irregular connective tissue that surrounds elastic and most hyaline cartilage?
Perichondrium
Perichondrium contains a reserve population of ____ that contribute to cartilage growth throughout life
chondroblasts
In its mature state, cartilage is ___ (no blood supply)
Avascular
Since cartilage is avascular how does it receive nutrients?
- Diffusion - brings nutrients and removes wastes
- This is why cartilage heals slowly after damage
What would heal more slowly - a meniscal tear or fractured bone?
Meniscal tear (due to being made of cartilage and decreased blood supply)
Where are some areas that fibrocartilage is located in the body?
- Pelvis
- Pubic symphysis
- Intervertebral discs
Where are some areas that hyaline cartilage is located in the body?
Areas of high movement:
- Ends of bones
- Connecting ribs to sternum (costal cartilage)
What area of the body has both fibrocartilage and hyaline in the same joint?
Knee
(Ends of bones = hyaline and in between there are menisci = fibrocartilage)
The center for growth in a bone occurs at?
The epiphyseal plate (growth plate)
What is the most common type of cartilage?
Hyaline
What type of cartilage has a glassy appearing matrix and contains invisible fine collagen fibers?
Hyaline cartilage
Hyaline cartilage is usually covered by?
Perichondrium
(“Chondrium covers”)
Hyaline cartilage is located in areas of high movement. What are some other specific areas of the body you would find it?
- Tip of nose
- Trachea & bronchioles, most larynx
- Costal cartilage
- Articular cartilage
- Epiphyseal plate
- Fetal skeleton (hyaline CT can transform into bone)
What type of cartilage contains a conspicuous weblike mesh of elastic fibers?
Elastic
Elastic cartilage is covered by?
Perichondrium (same as hyaline)
What type of cartilage provides flexible, elastic support in the outer ear and epiglottis?
Elastic
What type of cartilage is not associated with bones?
Elastic
What type of cartilage contains large, course parallel bundles of collagen fibers?
Fibrocartilage
What cartilage is not covered by perichondrium?
Fibrocartilage
What type of cartilage resists compression and absorbs shock in the pubic symphysis, menisci, TMJ, and intervertebral discs?
Fibrocartilage
What is fibrocartilage sensitive to in particular in pregnant females?
Sensitive to hormones - in the last few weeks of pregnancy the pubic symphysis and intervertebral discs soften - allowing for more flexibility and delivery of the baby
What is the danger with the flexibility of fibrocartilage?
In pregnant patients - they need to be counseled regarding stretching and be careful to not overstretch as their fibrocartilage softens
What are the main functions of bone?
- Support and protection
- Movement
How do bones provide support and protection?
- Provide structural support
- Serve as framework for the body
- Protect many delicate tissues
- rib cage - heart & lungs
- cranial bone - brain
- vertebrae - spinal cord
- pelvis - urinary/reproductive organs/GI tract
How do bones provide movement for the body?
- Serve as attachment sites for skeletal muscles, soft tissue, and some organs
- Function as a system of levers, muscle contraction - exerting a pull on the skeleton
The process of the production of blood cells and platelets occurs in red bone marrow and is called?
Hemopoiesis
The red bone marrow contains what types of cells?
Stem cells that form red blood cells, white blood cells, and platelets
The bone contains most of the body’s reserve of what two minerals?
Calcium and phosphate
The regulation of Ca++ in the blood stream is important for what functions?
- Nerve function
- Brain function
- Muscular contraction
Where are lipids stored at in some adult bones?
Yellow bone marrow in shafts of bones
(When young you need to have a lot of extra blood for growth, repair, and development - as adults - not as much growth so red marrow transforms to yellow)
Articular cartilage at the ends of bone are?
Avascular!
The epiphyseal plate is in the region of mature bone between the diaphysis (shaft) and the epiphysis (two ends), which is called?
The metaphysis
In children the epiphyseal plate is a thin layer of what type of cartilage?
Hyaline
(epiphyseal plate - often break in children)
In adults what does the eiphyseal plate turn into?
Epiphyseal line (remnant of epiphyseal plate, increased calcium deposit)