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Cronk Axial Skeleton
Chapter 7
51
Biology
Undergraduate 1
05/06/2012

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Term
Musculoskeletal system
Definition
formed from bones, muscles and joints
Term
Orthopedics
Definition
the branch of medicine science concerned with the prevention or correction
of disorders of the musculoskeletal system
Term
Axial skeleton
Definition
80 bones, lie along the longitudinal axis of the body which include the
skull bones, auditory ossicles, hyoid bone, ribs, sternum, & bones of the vertebral column
Term
The appendicular skeleton
Definition
consists of the bones the the upper and lower limbs as well as
the bones forming the girdles that connect the limbs to the axial skeleton
Term
Long bones
Definition
Greater length than width and are slightly curved for strength
Term
Short bones
Definition
Cube-shaped and are nearly equal in length and width
Term
Flat bones
Definition
Thin and composed of two nearly parallel plates of compact bone tissue
enclosing a layer of spongy bone tissue
Term
Irregular bones
Definition
Complex shapes and cannot be grouped into any of the previous
categories
Term
Sesamoid bones
Definition
Protect tendons from excessive wear and tear
Term
Sutural bones
Definition
Small bones located in sutures of cranial bones
Term
Depressions & openings
Definition
Allow the passage of blood vessels and nerves or form joints
Term
Processes
Definition
Projections or outgrowths that form joints or serve as attachment points for
ligaments and tendons
Term
cranial bones
Definition
Eight cranial bones form the cranial cavity. Frontal bone, two parietal
bones, two temporal bones, the occipital bone, the sphenoid bone & ethmoid bone
Term
Facial bones
Definition
Fourteen facial bones form the face. Two nasal bones, two maxillae, two
zygomatic bones, the mandible, two lacrimal bones, two palatine bones, two inferior nasal conchae, & vomer
Term
SKULL
Definition
• The cranial and facial bones protect and support special sense organs and the brain,
forming the large cranial cavity, as well as several smaller cavities • Immovable joints called sutures fuse most of the skull bones together: sagittal, coronal
lamboidal sutures • The facial bones form the framework of the face and provide support for openings to the
digestive and respiratory systems
Term
Frontal Bone
Definition
Forms the forehead
Term
Parietal Bones
Definition
Form the sides and roof of the cranial cavity
Term
Temporal Bones
Definition
Form the lateral aspects and floor of the cranium
Term
Occipital Bone
Definition
Forms the posterior part and most of the base of the cranium
Term
Sphenoid Bone
Definition
Lies at the middle part of the base of the skull
Term
Ethmoid Bone
Definition
A major superior supporting structure of the nasal cavity
Term
Nasal Bones
Definition
Form the bridge of the nose
Term
Maxillae
Definition
Forms the upper jawbone & anterior part of the hard palate
Term
Zygomatic Bones
Definition
form the prominences of the cheeks
Term
Lacrimal Bones
Definition
Form a part of the medial wall of each orbit
Term
Palatine Bones
Definition
Form the posterior portion of the hard palate
Term
Inferior Nasal Conchae
Definition
Form a part of the inferior lateral wall of the nasal cavity
Term
Vomer
Definition
Forms the inferior portion of the nasal septum
Term
Mandible
Definition
Lower jawbone. The only movable skull bone. Temporomandibular joint
Term
Nasal Septum
Definition
Divides the interior of the nasal cavity into right and left sides
Term
Orbits
Definition
Eye socket comprised of parts of the frontal, sphenoid, ethmoid, palatine,
zygomatic, lacrimal and maxilla. Five openings of the orbit are: optic foramen, superior
orbital fissure, inferior orbital fissure, supraorbital foramen & lacrimal fossa
Term
Sutures
Definition
sagittal, lamdoid, coronal, squamous
Term
Paranasal Sinuses
Definition
frontal, maxillary, ethmoid, sphenoid
Term
Fontanels
Definition
anterior, posterior, anterolateral, posterolateral
Term
HYOID BONE
Definition
Does not articulate with any other bone
Term
VERTEBRAL COLUMN
Definition
Composed of a series of bones called vertebrae (Adult=26)
Term
7 cervical
Definition
are in the neck region
Term
12 thoracic
Definition
are posterior to the thoracic cavity
Term
5 lumbar
Definition
support the lower back
Term
1 sacrum
Definition
consists of five fused sacral vertebrae
Term
1 coccyx
Definition
1 coccyx
Term
Abnormal curvatures
Definition
Kyphosis, Lordosis, Scoliosis
Term
Vertebral body
Definition
Intervertebral discs: between bodies of adjacent vertebrae Vertebral arch: 2 pedicels, 2 laminae
Term
Processes
Definition
composed of 7 processes, 1 spinous process, 2 transverse processes, 2 superior articular processes, 2 inferior articular processes
Term
THORAX
Definition
Thoracic cage is formed by the Sternum, Ribs, Costal cartilages, Thoracic vertebrae
Term
Sternum
Definition
“Breastbone”, manubrium, body, xiphoid process
Term
Ribs
Definition
Twelve pairs of ribs
Term
Costal cartilages
Definition
contribute to the elasticity of the thoracic cage
Term
vertebrocostal joints
Definition
Joints between the vertebrae and the ribs (tubercles & heads)
Term
sternocostal joints
Definition
Joints between the sternum and first seven pairs of ribs
Term
lumbosacral joints
Definition
Joints between the the fifth lumbar vertebra and the base of the sacrum
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