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How many cervicals are there?

7 (C1-C7)

what is also part of the axial skeleton along with skull,ribs,and sternum?

Vertebrae:discs

How many thoracics are there?

12 (T1-T12)

How many lunbars are there?

5 (L1-L5)

How many sacrum are there?

1 (S1)

How many coccyx are there?

coccyx

What allows the head to move in a "yes" fashion?

C1

What allows the head to move in a "no" fashion?

C2

These have transverse foraman?

C1-C7

What has a bifed spinous process?(hint: it forks)

C2-C6

What are found between C2-S1?

Discs - intervertebral discs that serve as shock absorbers foe the spine.

Explain a nerniation(when there is a herniation or bulged discs)....

The spinal nerves exiting the spinal cord can become impinged and inflammed; if this occurs in the L5-S1 area sciatica occurs (because it's the sciatic nerve) & pain can travel from lower back down to foot...

locations on the temporal bone?

Mastoid process and Styloid process and External auditory canal

What occurs with in the mastoid process?

Sternocleidomastoid muscle inserts on them, flexes head if both sides contract and rotates head if one side contracts.

What occurs with in the Styloid process?

Provides attachment site for stylo Hyoid ligament.

What is the external auditory canal?

Ear canal

8 Carpul bones

1)Scaphoid 2)Lunate 3)Triquetral 4)Pisiform 5)Trapezium 6)Trapizoid 7)Capitate 8)Hamate

5 functions of the skeleton?

1)Supports the body 2)Protects soft body parts 3)Produces blood cells 4)Stores minerals and fats 5)Along with the muscles permits flexible body movement.

The shaft or the ain portion of a lon bone is?

Diaphysis

The diaphysis has what, whose walls are composed of compact bone?

Medullary cavity

What is lined in the medullary cavity, and filoled with what?

lined with thin vascular memrane(the endosteum) and filled with yellow bone marrow, that stores fat..

What is the expanded region of a large bone called?

epiphyses

What are the epiphyses composed of?

largely of spongy bone that contains red bone marrow, where blood cells are made.

The epiphyses are coated with a thin layer of hyaline cartilage, called?

Articular cartilage (because it occurs at a joint)

how many bones are in a skeleton?

a newborn has nearly 300, some of which fuse together as a child grows. The human skeleton has approximately 206 bones, numbers vary between individuals..Some people have extra that help to fuse skull bones together(called wormian bones)...Others may have additional small bones in the ankles and feet....

What are the additional bones that help to fuse skull bones together called?

Wormian bones

Except for the articular cartilage on its ends, a long bone is completely covered by a layer of fibrous connective tissue called?

periosteum

the periosteum covering contains

blood vessels, lymphatic vessels and nerves

Branches of blood vessels are found throughout the?

medullary cavity (within the bone)

other branches of blood vessels can be found with in the________, with in the bone tissue?

central canals

ligaments and tendons are also connected to the bone at the?

periosteum

_____ is highly organized and composed of tubular units called osteons?

Compact bone

In a cross section of an osteon, bone cells called ________ lie in a lacunae, tiny chambers arranged in concentric circles around a central canal.

osteocytes

_______ connect the lacunae with one another and with the central canal?

canaliculi

_____ nearest the center of an osteon exchange nutrients and waste with the blood vessels in the central canal.These cells then pass on nutrients and collect wastes from the other cells via gap junction..

Osteocytes

Compared with compact bone, what has an unorganized appearance?

Spongy bone

Spongy bone contains numerous thin plates called _______ seperated by unequal spaces..

Trabeculae

Although spongy bone is lighter than compact bone, spongy bone is still ____________

designed for strength

The spaces of spongy bone are often filled with_________, a specialized tissue that produces all types of blood cells.

red bone marrow

_________ is not as strong as bone, but it is more flexible. Its matrix is gel-like and contains many collagenous and elastic fibers.

Cartilage

the cells called _____ lie within lacunae that are irregularly grouped.

chondrocytes

_________ has no nerves making it well suited for padding joints where the stresses of movement are intense.

catrilage

________ also has no blood vessels and relies on neighboring tissues for nutrients and waste exchange. This makes it slow to heal.

cartilage

3 types of cartilage?

1)Hyaline catrilage 2)Fibrocartilage 3)Elastic cartilage

Explain hyaline cartilage?

Firm and somewhat flexible.matrix appears uniform and glassy, but actually it contains a generous supply of collagen fibers. Hyaline cartilage is found at the end of long bones, in the nose, at the end of ribs,and in the larynx and trachea..

Explain fibrocartilage?

Stronger than hyaline catilage because the matrix contains wide rows of thick, collagen fibers. Fibrocartilage is able to withstand both tension and pressure and is found where support isf prime importance-in the disks located between the vertebrae and also in the cartilage of the knee.

Explain elastic carilage

More flexible than hyaline cartilage because the matrix contains mostly elastin fibers.This type of cartilage is found in the ear flaps and the epiglottis

_________ contains rows of cells called fibroblasts seperated by bundles of collagenous fibers. This tissue makes up ligaments and tendons.

fibrous connective tissue

___ connect bone and bone?

ligaments

___ connect muscle to bone at a joint (also called an articulation)

tendons

In a sense bones can grow throughout a lifetime because they are able to respond to stress by changing size, shape and strength, this process is called

remodeling

by bones ability to grow, remodel and undergo repair they are_________

living tissue.

What different types of cell are involved in bone growth, remodeling, and repair?

1)osteoblasts 2)osteocytes 3)osteoclasts

osteoblasts are?

bone forming cells. They secrete the organic matrix of bone and promote the deposition of calcium and salts into the matrix

osteocytes are?

mature bone cells derived from osteoblasts, they maintain the structure of bone

osteoclasts are?

bone absorbing cells. They breakdown bone and assist in returning calcium and phosphate to the blood

throughout life _______are removing the matrix of bone,and___________ are building it up. When_______are surrounded by calcified matrix, they become the __________within lucanae.

osteoclasts, osteoblasts, osteoblasts,osteocytes

Formation of bones is?

ossification

2 types of ossification?

intramembranous and endochondral

describe intramembranous ossification?

Flat bones, such as the bones of the skull are examples of intramembranous ossification, in this way bones develope between sheets of fibrous connective tissue.Here cells derived from connective tissue cells become osteoblasts located in ossification centers.The osteoblasts secrete the organic matrix of bone.

Describe endochondral ossification?

Most of the bones of the human skeleton are formed by endochondral ossification. During which bone replaces the cartilaginous models of the bone . Gradually the cartilage is replaced by the calcified bone matrixthat makes these bones capable of bearing weight.* inside bone formation spreads from the center to the ends, and this accounts for the term used for this type of ossification..(Endochondral literally means"within cartilage")...the long bone such as the tibia is an example of this ossification....

Explain cartilage model

In the embryo chondrocytes lay down hyaline cartilage which is shaped like the future bones.As the cartilage models calcify, the chondrocytes die off...

Explian the bone collar

osteoblasts are derived from the newly formed periosteum. Osteoblasts secrete the organic bone matrix,and the matrix undergoes calcification.The result is a bone collar which covers the diaphysis.The bone collar is composed of compact bone.In time the bon e collar thickens

Explain primary ossification center

Blood vessels bring osteoblasts to the interior, and they begin to lay down spongy bone.This region is calleda primary ossification cente rbecause it is the first center for bone formation.

Explain the medullary cavity and secondary ossification sites?

The spongy bone of the diaphysis is absorbed by osteclasts, and the cavity created becomed the medullary cavity. Shortly after birth secondary ossification centers form in the epiphysis. Spongy bone persists in the epiphysis and they contain red bone marrow for quie some time.Cartilage is present at two locations: the epiphyseal(growth) plate and articular cartilage which covers the ends of long bones..

Explain the epiphyseal (growth) plate?

A band of cartilagge called a growth plate remains between the primary ossification center and each secondary center. The limbs keep increasing in length as long as the growth plates are still present.

Name the 4 zones of the epiphyseal plate

1)resting zone-where cartilage remains 2)proliferaing zone-in which chondrocytes are producing new cartilage cells 3)degenerating zone-the cartilage cells are dying off 4)ossification zone-bone is forming.bone formation here causes the length of the bone to increase. the inside layer of articular cartilage also undergoes ossification in the manner described.

When can bone length no longer occur?

When the epiphyseal plates close

What age does the epiphyseal plates in the arms and legs typically close for women?

16-18

What age does the epiphyseal plates in the arms and legs typically close for men?

20

Portions of other bones, then the epipyseal plates may continue to grow until which age?

25

_______ are chemical messengers secreted by the endocrine glands and distributed about the body by the blood stream. These also control the activity of the epiphyseal plate

Hormones

A ______ is a chemical messenger produced by one part of the body, which acts on a different part of the body.

Hormone

In the kidneys vitamin D is converted to a hormone that acts on the?

Intestinal tract

What is the chief function of vitamin D?

intestinal absorption of calcium

Children can develope what from the lack of vitamin D?

Rickets, a condition marked by bone deformities including bowed long bones.

What directly stimulates growth of the epiphyseal plate, as well as bone growth in general?

Growth Hormone (GH)

When is the growth ineffective?

if the metabolic activity of cells is not promoted..

What does the thyroid hormone do?

promotes the metabolic activity of cells.

What will to little growth hormone in childhood result in?

Dwarfism

what will too much growth hormone during childhood result in?

(prior to epiphyseal fusion)can produce excessive growth and even gigantism.

_______ results from excess GH in adult following epiphyseal fusion.This condition produces excessive growth of bones in the hands and the face.

Acromegaly

Adolescents usually experience a dramatic increase in height, called a growth spurt, due to an increased level of? These hormones apparently stimulate osteblast activity.

Sex Hormones

Rapid growth causes epiphyseal plates to?

Become "paved over" by the faster growing bone tissue, within one or two years of the onset of puberty.

Bone is constantly being?

Broken down by osteoclasts and and reformed by osteblasts in the adult.As much as 18% of bone is recycled each year.

This process of bone renewal is often called ______ normally keeps bones strong.

Bone remodeling

In what disease is new bone generated at a faster-than-normal rate. This rapid remodeling produces bone that's softer and weaker than normal bone and can cause bone pain, deformities and fractures

Paget's disease

Bone recycling allows?

The body to regulate the amount of calcium in the blood...

To illustrate that the ____________ is critical,recall that calcium is required for blood to clot.

blood calcium level

If the ______________is too high, neurons and muscle cells no longer function.

Blood calcium concentration

If calcium fallstoo low nerve and muscle cells become so excited that what occurs?

Convulsions

the _______are the storage sites for calcium, if the blood calcium rises above normal, at least some of the excess is deposited here..

Bones

If the ________dips to low calcium is removed from the bones to bring it back up to the normal level..

blood calcium

2 hormones in particular are involved in regulating the blood calcium level

parathyroid hormone (PTH) and Calcitonin

Also accounts why bones can respond to stress

Bone remodeling

What happens to a particular bone when it is called apon to engage in an activity in which the particular bone will be used?

Enlarge in diameter at the region most affected by the activity.

Increasing the size of the______ prevents the bones from getting to heavy and thick..

medullary cavity

Bone repair takes place over a span of several months in a series of 4 steps:

1)Hematoma 2)Fibrocartilaginous callus 3)Bony callus 4)remodeling

What occurs during a hematoma?

After a fracture blood escapes from ruptured blood vesselsand forms a hematoma(mass of clotted blood) in the space between the broken bones..forms within 6 to 8 hours

What occurs during a fibrocartilageinous callus?

Tissue repair begins and a fibrocartliaginous callus fills the space between the ends of the broken bone for about three weeks.

What occurs during a bony callus ?

Osteoblasts produce trabeculae of spongy bone and convert the fibrocartilage callus to a bony callus that joins the broken bones together. This lasts for about three to four months..

What occurs during remolding?

Osteoblasts build new compact bone at the periphery. Osteoclasts absorb the spongy bone, creating a new medullary cavity.

3 types of bone cells

1)osteoblasts 2)osteocytes 3)osteoclasts

In some ways bone repair parallels the developement of a bone except which steps?

the first step hematoma indicates injury has occured and fibrocartilaginous callus precedes the production of compact bone.

A_________is complete if the bone is broken clear through and incomplete if the bone is not seperated in two parts.

Fracture

A_________is simpl if it does not pierce the skin.

Fracture

A __________ pierces the skin?

Compound fracture

______means that the broken ends are wedged into each other?

Impacted

A_________occurs when the break is ragged due to twisting of a bone.

Spiral fracture

The 206 bones of the skeleton are classified according to whether they occur in the __________or the___________?

axial skeleton and appendicular skeleton

Which lies in the midline of the body and consists of the skull,hyoid bone, vertebral column, and the rib cage.

Axial skeleton

What protects the brain?

The cranium

What is formed by the cranium (braincase) and the facial bones. However, some cranial bones contribute to the face.

Skull

In adults what is composed of eight bones fitted tightly together and in newborns certain bones are not completely formed

Cranial bones

fontanels are?

bones joined by membranous regions. Usually closed by the age of 16 months by the process of intramembranous ossification.

Some of the bones of the cranium contain the sinuses which are?

Air spaces lined by mucous membrane. The sinuses reduce the weight of the skull and give a resonant sound to the voice.

2 sinuses are called the? and drain where?

mastoid sinuses , drain into the middle ear.

What is a condition that can cause deafness, is an inflammation of these sinuses?

Mastoiditis

Upper jaw

maxilla

lower jaw

mandible

The major bones of the cranium have the same name as the lobes of the brain?

frontal,parietal,occipatal, and temporal..

On the top of the cranium, the ________ forms the forehead..

frontal bone

________extend to the side, and the ______curves to form the base of the skull.

parietal bone, occipital bone

Below the much larger parietal bones, each______has an opening (external auditory canal) that leads to the middle ear

temporal bone

There is a large opening, the __________, through which the spinal cord passes and becomes the brain stem.

foramen magnum

The ________ shaped like a bat with outstretched wings, extended across the floor of the cranium from one side to the other.This is the keystone of the cranial bones because all the other bones articulate with it.

Sphenoid bone

the sphenoid completes the sides of the skull and also contributes to forming what?

The orbits(eye sockets)

________which lies in front of the sphenoid also helps form the orbits and the nasal septum

ethmoid bone

the__________are completed by various facial bones.

orbits

The eye sockets are called orbits why?

Because we can rotate are eyes

What is the most prominant of the facial bones are the?

mandible, maxillae,zygomatic bones, and the nasal bones.

The__________, or the lower jaw is the only movable portion of the skull,and it also forms the chin

mandible

The _______form the upper jaw and a portion of the eye socket.

maxillae

Further the hard palate and the floor of the nose are formed by?

maxillae(anterior)

Joined to the palatine bones are formed?

maxillae(posterior)

Tooth sockets are found in both the?

Mandible and Maxillae

The grinding action of the mandible and the maxillae allow?

chewing of our food

lips and cheeks have a core of?

skeletal muscle

What are the cheekbone prominences?

Zygomatic bones

What form the bridge of the nose?

Nasal bones

Other bones the __________and__________are a part of the nasal septum, which divides the interior of the noseinto two nasal cavities..

ethmoid and volmer

The ________contains the opening for the nasolacrimal canal, which drains tears from the eyes to the nose.

lacrimal bone

The ________ and the wings of the _______account for the flattened areas we call the temples.

temporal bone, sphenoid bone

The __________ forms the forehead and has supraorbital ridges, where the eyebrows are located.

Frontal bones

Glasses sit where the________ joins the _______.

frontal bone, nasal bones

The exterior portion of the ears are formed only by ____and not by bones.

cartilage

The_______is a mixture of bones,cartilage,and connective tissue.

nose

__________completes the tip of the nose, and fibrous ____________forms the flared sides of the nose.

cartilage, connective tissue

The________forms the forehead and eyebrow ridges.

frontal bones

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