What Is Central Canal Stenosis Mean

Skeletal System consists of a set of bones and cartilage. Constitutes approximately 18% of body weight (1). Bones meet at joints, allowing them to move while maintaining a significant relationship between the two (2). The skeletal system performs six basic functions (1) (2):

• Hold the soft tissues
• Protection of important internal organs
• assistance in moving
• mineral homeostasis, especially calcium and phosphorus production
blood cell storage triglycerides

bone tissue (bones) is alive, the internal or endoskeleton. Grows as the body makes, adapts to the conditions of life of individuals and has the ability to compose itself after an illness or injury (2). Other types of tissues that make up the skeletal system are cartilage, dense connective tissue, epithelium, fat and nerve tissue.
has two main parts: the axial skeleton, formed by the bones of the skull, spine and chest cavity, and the appendicular skeleton, consisting of upper and lower limbs (3).

shoulder girdle and pelvic girdle are the parts where the Axial Skeleton meets the appendicular skeleton.

Classification of bones by shape

Long Bones: are tubular structures dominated the length of the thickness and width. Consist of the shaft which is the cylindrical part of the bone long. Epiphyses that are proximal and distal end of the bone. Metaphysis which are the regions of bone where the shaft joins the epiphysis (1) and usually are considered growth areas.

Principal Parts of a long bone
Taken from Life Sciences Blog http://hnncbiol.blogspot.com/2008_01_01_archive.html

Long bones also have the articular cartilage, which is a thin layer covering the area where bone epiphysis articulates with another. The periosteum is a tough sheath of dense connective tissue surrounding the irregular bone surface in places that are not covered by cartilage. The marrow cavity is the space within the diaphysis in adults contains yellow bone marrow. The endosteum is a thin membrane that limits the marrow cavity, which contains a single layer of bone-forming cells and connective tissue (1).

Most of the long bones found in the upper and lower limbs (2). Such bones include the femur, humerus, phalanges and clavicle. Short Bones

: structures cuboid, restricted volume and three axes (length, thickness and width) are similar (2). This type of bones including the vertebrae, carpals and tarsals (3).

Bones Short
Monografias.com Taken
http://www.monografias.com/trabajos38/sistema-osteomuscular/sistema-osteomuscular.shtml

Plans Bones: structures thickness is small, dominated by the length and width (2). These bones exert protective functions of other organs. They have two layers of periosteum and between them a layer of spongy bone that houses the bone marrow. Such bones include the skull, pubic, scapulae, the ilium and sternum. The latter two are considered the richest in bone marrow.

The Parietal Bone (Plano)
Taken of Human Anatomy for Dentists
http://anatodonto.blogspot.com/2006/08/clase-5-craneo-oseo.html

irregular bones s: bones are those that can not be classified as another type. The bones of the face (2) and vicerocráneo (3) belong to this type.

the zygomatic bone (Irregular) Taken from dicciomed.es


20Bones.jpg http://www.probertencyclopaedia.com/j/Zygomatic%

sesamoid bone: are bones of small size, considered a variety of short bones. Found in the joints where tendons cross the ends of long bones. The patella, located in the quadriceps tendon is the largest sesamoid bone. The hyoid bone is another example of this type, but is also considered a short bone, flat and irregular.

The Patella (sesamoid)
logabonitodemucambo.blogspot.com Taken
http://jogabonitodemucambo.blogspot.com/2009/04/goleira-jessika-rompeu-patela-do-joelho . html

Classification of bones according to their structure

Depending on their structure, bones can be classified into spongy bone and compact bone . The first consists of trabecular bone from about 0.1 to 0.5 mm. In those regions where housing is bone marrow. Compact bone consists of rigid bone plates.

compact and spongy bone
Taken from Rush University Medical Center
www.rush.edu/spanish/images/si_0061.gif

All bones have both types of bone or tissue . In the long bones, the spongy tissue tends to be localized in the epiphysis, while the compact tissue predominates in the shafts. In the particular case of the cranial vault, the cancellous bone is known as diploe.

To read more:

(1) Tortora, Gerald. Derrickson, Bryan. 2006. Principles of Anatomy and Physiology. 11 th. Edition. Editorial Médica Panamericana. Mexico DF. Mexico. Cap 6.

(2) Amagi, Atilio. Barranza Fernando. Rodriguez, Fernando. Lizana, Pablo. Human Anatomy Laboratory. Guide # 1. Pontificia Universidad Católica de Valparaíso. Faculty of Sciences. Online. Date of Consultation: 15/Enero/2010.
Available at:
http://www.anatomiahumana.ucv.cl/efi/2008/Guias% 202008/Guia% 20Osteologia% 201.pdf

(3) Montoya, Katia. 2009. Anthology of General Anatomy. American University. Faculty of Physical Therapy. San Jose, Costa Rica.