Skeletal system Pt. 1 Flashcards
Parts of the skeletal system (4)
Bones (skeleton)
Joints
Cartilages
Ligaments
bone to bone= ____
bone to muscle= ____
bone to bone= ligaments
bone to muscle= tendon
Two divisions of skeletal system
Axial skeleton
Appendicular skeleton
Axial skeleton: (3)
Appendicular skeleton: (4)
Axial skeleton: bones of the skull, vertebral column, and rib cage;
Appendicular skeleton: bones of the upper and lower limbs, shoulder and hip
Functions of Bones (5)
- Support of the body
- Protection of soft organs
- Movement due to attached skeletal muscles
- Storage of minerals and fats
- Blood cell formation
The adult skeleton has ___ bones
206
Two basic types of bone tissue
compact bone
spongy bone
____= homogenous
____= small needle-like; open spaces
compact bone
spongy bone
Classification of Bones (4)
Long bones
Short bones
Flat bones
Irregular bones
-Typically longer than wide
-Have a shaft with heads at both ends
Long bones
bone that is generally cube-shape
short bones
Contain mostly compact bone= ___
Contain mostly spongy bone=___
compact bone= long bones
spongy bones= short bones
Thin and flattened
Usually curved
Flat bones
Thin layers of compact bone around a layer
of spongy bone
flat bones
irregular shape; Do not fit into other bone classification categories
irregular bones
Examples of:
Long bones-2
Short bones-2
Flat bones-3
Irregular bones-2
Long bones- Femur, humerus
Short bones- carpals, tarsals
Flat bones- Skull, ribs, sternum
Irregular bones- vertebrae; hip
Gross Anatomy of a Long Bone (2)
Diaphysis;
Epiphysis
Anatomy of Long bone:
-Shaft (middle)
-Composed of
compact bone
Diaphysis
Anatomy of Long bone:
-Ends of the bone
- Composed mostly of
spongy bone
Epiphysis
Structures of a Long Bone (5)
-Periosteum
-Sharpey’s fibers
-Arteries
-Articular cartilage
-Medullary cavity
-Outside covering of
the diaphysis;
-Fibrous connective
tissue membrane
Periosteum
Secure periosteum to
underlying bone
Sharpey’s fibers
Supply bone cells
with nutrients
Arteries
Covers the external
surface of the
epiphyses
Articular cartilage
Articular cartilage:
-Made of ____
-Decreases ___at
joint surfaces
hyaline cartilage;
friction
Cavity of the shaft;
contains marrow
Medullary cavity
Medullary cavity:
yellow marrow=
red marrow=
yellow marrow= adults
red marrow= infants
-Surface features of bones
-Sites of attachments for muscles, tendons,
and ligaments
-Passages for nerves and blood vessels
Bone Markings
Categories of bone markings (2)
Projections and processes;
Depressions or cavities
Categories of bone markings:
____– grow out from the
bone surface
_____– indentations
Projections and processes ;
Depressions or cavities
Name of bone marking (Projections that are sites of muscle and ligament attachment): 8
Tuberosity
Crest
Trochanter
Line
Tubercle
Epicondyle
Spine
Process