Skeletal System Flashcards
Osteoblasts
Bone forming cells
Osteocytes
Mature bone cells that maintain the bone but do not divide to produce new bone tissue
Osteoclasts
Cells that are involved with the breakdown of bone
Compact Bone
hard and dense; it makes up the main shaft of long bones and the outer layer of other bones
Spongy Bone
a meshwork of bone fragments filled with red marrow and is located at the ends of long bones and at the center of other bones.
Red Marrow
Found at the ends of long bones and at the center of other bones (flat bones). Function is to produce blood cells.
Yellow Marrow
Found in the cavities of long bones and consists mostly of fat cells or adipose tissue.
Periosteum
The outer membrane of bones. Contains osteoblasts, blood and lymph vessels and nerve fibers.
Endosteum
Line the marrow cavity of bones.
Long Bones
Long bones with a shaft and irregular shaped ends; Femur and Humerus
Diaphysis
Long shaft on the long bones
Epiphysis- Proximal and Distal
The two irregular shaped ends on the long bones
Short Bones
Have approximately the same dimensions in all directions; cubed-like bone in the wrist and ankles
Flat Bones
Bones with two surfaces roughly parallel and close to each other (
Irregular Bones
Bones that do not fit in any other category; like vertebrae and jaw bone (Mandible)
Sesamoid Bones
Small, rounded bones that develop within a tendon or a joint capsule; like the patella or knee cap
Axial Skeleton- Cranial Bone- Frontal
(1) Foehead bone
Axial Skeleton- Cranial Bone-Parietal
(2) Top and side walls of the cranium
Axial Skeleton- Cranial Bone- Temporal
(2) Form central sides of cranium around ear
Axial Skeleton- Cranial Bone- Occipital
(1) Forms the posterior part of the cranium; the large hole, FORAMEN MAGNUM
Axial Skeleton- Cranial Bone - Sphenoid
(1) A compound bone that forms the base of the cranium, behind the eye and below the front part of the brain.
Axial Skeleton- Cranial Bone - Ethmoid
(1) An unpaired cranial bone that is a significant component of the upper nasal cavity and the nasal septum.
Axial Skeleton- Facial Bone - Nasal
(2) Small bones which form the upper part of the bridge of the nose
Axial Skeleton- Facial Bone- Vomer
(1) Forms lower part of the nasal septum
Axial Skeleton- Facial Bone- Inferior Conchae
(2) Bones situated on the lateral wall of the nasal cavities
Axial Skeleton- Facial Bone- Lacrimals
(2) Thin bones the size of fingernails; located near the inner corner of the eye
Axial Skeleton- Facial Bone- Zygomatic
(2) Cheek bone; forms part of the eye socket
Axial Skeleton- Facial Bone- Palatine
(2) L-shaped bones; form posterior part of hard palate; also form the floor and lateral walls of the nasal cavity
Axial Skeleton- Facial Bone- Maxilla
(2) Upper jaw bone; two bones fuse to form the upper jaw and the anterior part of the hard palate
Axial Skeleton- Facial Bone- Mandible
(1) Lower jaw bone; ONLY MOVABLE BONE IN THE SKULL
Axial Skeleton- Ear Bones (Ossicles)- Malleus
(2) Middle ear bone; malleus means HAMMER
Axial Skeleton- Ear Bones (Ossicles)- Incus
(2) Middle ear bone; incus means ANVIL
Axial Skeleton- Ear Bones (Ossicles)- Stapes
(2) Middle ear bone; stapes means STIRRUPS
Axial Skeleton- Ear Bones (Ossicles)- Hyoid
(1) U-shaped bone in the neck at the base of the tongue, forms the functional part of the support of the larnyx
Axial Skeleton- Vertebral Column- Cervical Vertebrae
(7) Upper seven vertebrae in neck region
Axial Skeleton- Vertebral Column- Thoracic Vertebrae
(12) Next twelve bones in the vertebrae column; ribs articulate with these
Axial Skeleton- Vertebral Column- Lumbar Vertebrae
(5) Next 5 vertebrae; largest of the vertebrae; located in the small of the back
Axial Skeleton- Vertebral Column- Sacrum
(1) In children 5 bones; in adults fuse into one; wedged between the two hip bones
Axial Skeleton- Vertebral Column- Coccyx
(1) Tailbone; in children four separate vertebrae; in adults it fuses into one
Axial Skeleton- Thorax- True Ribs
(14-seven pairs) Upper seven pairs; attached to the sternum by costal cartilage
Axial Skeleton- Thorax- False Ribs
(10- five pairs) Lower 5 pairs; upper three attach to the sternum by way of coastal cartilage, LOWER TWO do not attach to the sternum and are known as FLOATING RIBS
Axial Skeleton- Thorax- Sternum
(1) Breast bone- contains three parts, superior called the MANUBRIUM, the middle called the BODY and inferior called the XIPHOID PROCESS. In youth it is made of cartilage becomes bone in adults. Landmark for CPR.
Appendicular skeleton- Shoulder Girdle- Clavical
(2) Collar bone, slender bone with a slight curvature, function is to brace the shoulder
Appendicular skeleton- Shoulder Girdle- Scapulae
(2) Shoulder Blade, located on the upper back part of the thorax; flat triangular shaped bone
Appendicular skeleton- Upper Extremities- Humerus
(2) Upper arm bone; articulates superiorly with the scapula and inferiorly with the radius and ulna