Skeletal System Part 1

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Anatomy

the study of the form and structure of an animal body and its parts

Physiology

the study of the functions of the animal body and its parts

Left

The animal's left

Right

The animal's right

Cranial

toward the head

Caudal

toward the tail

Rostral

toward the tip of the nose. Used to describe positions and directions only on the head

Dorsal

toward the top when an animal is standing on all four legs; toward the backbone

Ventral

toward the bottom surface of an animal when it is standing on all fo legs; toward the belly

Medial

toward the median plane (center line) of the body

Lateral

away from the median plane of the body

Deep

toward the center of the body or a body part

Superficial

toward the surface of a body or a body part

Proximal

used only for extremities; a position or direction toward the body proper (trunk)

Distal

used only for extremities; a position or direction away from the body proper

Palmar

the caudal surface of the forelimb distal to the carpus

Plantar

the caudal surface of the forelimb distal to the tarsus

Homeostasis

the maintenance of equilibrium or balance in the body

Diffusion

The tendency for molecules to move from an area of higher concentration to an area of lower concentration

Facilitated Diffusion

the diffusion of molecules across the cell membrane with the aid of carrier proteins. No energy or ATP is required.

Osmosis

the passive movement of water through a semipermeable membrane from a dilute solution to a more concentrated one

Active Transport

the active movement of molecules by specific carrier proteins; molecules may move against a concentration gradient; energy required in the form of ATP

ATP

is a high energy molecule produced in the mitochondria of cells

Osteology

the study of bone

Bone

- is the second hardest natural substance in the body - the hardest substance is tooth enamel
- A vital living tissue with the ability to heal itself
- Composed of cells embedded in a hard matrix. Soft material becomes hard bone as calcium and phosphate are added

Osteoblasts - Bone Cels

build bone. Osteoblasts secrete the matrix and supply the calcium and phosphate to harden the bone

Ossification - Bone Cells

the formation and hardening of bone

Osteocytes

mature bone cells trapped in the hard matrix. an osteocyte can revert back into an osteoblast

Lucunae

Osteocytes are former osteoblasts that exist in spaces in the ossified matrix called

Canaliuci

receive their blood supply and communicate through little channels called

Osteoclasts

responsible for eating excess bone away. Necessary for remodeling of bone. Also allow the body to withdraw calcium from bone to raise calcium levels in the blood

Bone Formation

two mechanisms: endochondral ossification and intramembranous ossification

Endochondral Ossification

Most common. Cartilage in the fetus replaced by bone

Intramebranous Ossification

Occurs only in the bones that form parts of the skull. Bone forms from fibrous membranes that cover the brain in the developing fetus

Diaphysis

shaft of a long bone. In the developing fetus when cartilage is being replaced by bone, the diaphsis is the primary growth center

Epiphysis

the ends of a long bone. In the fetus - secondary growth centers

Epipyseal or growth plates (physis)

areas between the diaphysis and the epiphysis where new bone is formed. Cartilage plates in very young animals that allow the bones to lengthen as the animal grows. When the plates ossify, the bone stops growing in length.

Volkman's Canals

tiny blood vessels from the periosteum pass through the bone at right angles in passageways through the bone called Volkmann's canals. Source for most of the blood supply to the bone cells. Blood vessels in Volkmann's canals join with blood vessels in Haversian canals

Haversian Canals

run lengthwise in the bone; contain blood vessels, lymph vessels and nerves that supply the osteocytes in the Haversian systems

Nutrient Foramina

Large channels in some larger bones, esp. long bones, that provide passageway for large blood vessels. These larger vessels primarily carry blood into and out of bone marrow. On a radiograph a nutrient foramina can look like a crack in the bone cortex

Two Main Types Of Bone

cancellous bone and compact bone

Cancellous Bone

spongy bone; tiny spicules of bone with marrow in between. Helps make the bone lighter but still strong.

Compact Bone

heavy, dense, and strong. In the diaphyses of long bones and forms the outside layer of all bones. Compact bone is composed of tiny, tightly compacted cylinders of bone called haversian systems

Haversian Systems

concentric layers of dense bone arranged around a central canal; run lengthwise in the shafts of long bones

Periosteum

the fibrous membrane that covers the outside of bone EXCEPT for their articular ( joint ) surfaces. (The inner surface of the periosteum contains osteoblasts that allow bone to increase in diameter and are involved in the healing of bone fractures.)

Endosteum

just like the periosteum but lines the hollow interior of bones

Long Bones

femur, humerus, tibia, radius, ulna

Short Bones

carpal and tarsal bones

Flat Bones

scapula, pelvis, some skull bones

Irregular Bones

vertebrae, some skull bones, sesamoid bones. Sesamoid bones are found in some tendons

Red Bone Marrow

Ø Hematopoietic tissue ( produces blood cells )
Ø Major marrow in young animals
Ø Only a small percentage of the marrow in adult animals
Ø In the adult, red bone marrow is in the ends of some long bones and in bones of the pelvis and sternum ( cancellous bone

Yellow Bone Marrow

Ø Adipose tissue ( fat )
Ø Most common type of bone marrow in adults
Ø Not very hematopoietic
Ø Found in the shafts of long bones
Ø Can revert to red bone marrow if body needs to produce more blood cells

Articular Surfaces

- joint surfaces
- a smooth area of compact bone where bones come into contact with one another to form joints. Each articular surface is covered by a thin layer of hyaline cartilage. There is no periosteum covering articular cartilage

Condyle

a large round, cylindrical articular surface. The major condyles are located on the distal end of the femur and the humerus and on the occipital bone of the skull

Head

a spherical articular surface on the proximal end of the femur, the humerus, and ribs. The head of the humerus and femur form the ball portion of the shoulder and hip ball-and-socket joints

Facet

a flat articular surface where joint movement would be a rocking motion. Examples include carpal and tarsal bones; vertebrae; and some long bones such as radius and ulna

Processes

Lumps and bumps on bones. Examples of processes include articular surfaces such as condyles and heads; and sites for muscle attachments such as vertebral spinous processes, the spine of the scapula, the greater trochanter of the femur, the tubercle of the humerus, etc

Foraman

a hole in bone. Examples include nutrient foramina and the two large obturator foramina of the pelvis

Fossa

a depressed or sunken area on the surface of a bone. Usually occupied by muscles or tendons

Support - Functions of Bone

provides attachment sites for muscles; support for the soft tissues of the body

Protection

surrounds many delicate organs and tissues. Example - the bones of the skull protect the brain

Leverage

attachment of muscles to bone via tendons allows the muscles to move the joints

Storage

stores most of our calcium and other minerals

Calcitonin

a hormone from the thyroid gland that helps to prevent hypercalcemia by depositing excess calcium from the blood into bone

Parathyroid

hormone from the parathyroid gland prevents hypocalcemia by withdrawing calcium from bone

Blood cell formation - hematopoiesis

occurs in bone marrow

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