Skeletal System Flashcards
What is the function of the skeleton?
Support Protection Movement Shape Blood cell production & mineral salt storage
Why do we need the skeleton for support?
Otherwise we would collapse
Why do we need the skeleton for protection?
Protects vital organs
Why do we need the skeleton for movement?
The attachment for muscles
Why do we need the skeleton for blood cell production & mineral salt storage?
Red & white blood cells produced in bone marrow & calcium stored in bones
What are the 5 bone classifications?
Long Short Flat Irregular Sesamoid
Characteristics & examples of LONG bones
Length greater than width
Act as levers, pulled by contracting muscles
Arms, legs
Characteristics & examples of SHORT bones
Equal in length, width & thickness
Irregularly shaped
Carpals, tarsals
Characteristics & examples of FLAT bones
More curved & thin than flat
Ribs, sternum, scapulae
Characteristics & examples of IRREGULAR bones
Vertebrae
Characteristics & examples of SESAMOID bones
Small bones embedded with certain tendons that connect bones to muscles
Patella
What are the 3 types of cartilage?
Yellow/elastic
Hyaline or articular cartilage
White fibrocartilage
Characteristics & examples of YELLOW/ELASTIC cartilage
Soft & slightly elastic
Ear lobe & epiglottis
Characteristics of HYALINE/ARTICULAR cartilage
Solid & smooth protects bones from wear & tear
Characteristics & examples of WHITE FIBROcartilage
Tough & slightly flexible
Shock absorber
Prevents damage to bone
Between vertebrae
Tendons connect..
Muscle to bone
Ligaments connect..
Bone to bone
An example of a tendon
Achilles tendon
An example of a ligament
Cruciate ligament of the knee
What bones does the axial skeleton consist of?
Skull
Vertebral column
Sternum
Ribs
What bones does the appendicular skeleton consist of?
Shoulder girdle Hip girdle Bones of the arm Bones of the hands Bones of the legs Bones of the feet
What is a joint?
Where the two or more bones meet
What does a synovial joint do?
It allows free movement
The 5 common features of a synovial joint
Synovial fluid Articular cartilage Joint capsule Bursa Ligament
What is the structure & function of the SYNOVIAL FLUID in a synovial joint?
Lubricating liquid contained within the joint cavity
Reduces friction and nourishes articular cartilage
What is the structure & function of the ARTICULAR CARTILAGE in a synovial joint?
Smooth tissue which covers the surface of articulating bones
Absorbs shock and allows friction free movement
What is the structure & function of the JOINT CAPSULE in a synovial joint?
A fibrous sac with an inner synovial membrane
Encloses and strengthens the joint secreting synovial fluid
What is the structure & function of the BURSA in a synovial joint?
A closed fluid filled sac found where the tendons rub over bones
Reduces friction between tendons and bones
What is the structure & function of the LIGAMENT in a synovial joint?
A tough band of slightly elastic connective tissue
Connects bone to bone and stabilises joint during movement
Articulating bones of the spine
Vertebrae
Articulating bones of the knee
Femur, tibia, patella
Articulating bones of the ankle
Tibia, tarsal
Articulating bones of the shoulder
Humerus, scapula
What are the 4 types of joints?
Ball & socket
Pivot
Hinge
Condyloid
Features of the ball & socket joint
shoulder & hip
Top of humerus & femur shaped like a ball
Fits into the cup in the scapula and pelvis
Features of the pivot joint
neck
Ring of bone sits on top of peg
Only movement is rotation
Features of the hinge joint
elbow, knee & ankle
Two or more long bones come together
Like a door
Only moves two ways extension and flexion
Features of the condyloid joint
wrist
Allows flexion, extension, abduction, adduction & circumduction
What are the 3 planes of movement?
Sagittal, Horizontal & Frontal
Anterior means..
front
Posterior means..
back
Proximal means..
closer to where arm/leg inserts into the body
Distal means..
further to where arm/leg inserts into the body
Superior means..
above/towards head
Inferior means..
towards feet/below
Medial means..
closer to midline
Lateral means..
further from midline
Sagittal cuts the body..
lengthwise (vertical)
Frontal cuts the body..
sideways
Transverse cuts the body..
horizontally
Flexion is when the angle of the joint is..
reduced
Extension is when the angle of the joint is..
increased
Flexion and extension happens at the..
Elbow Hip Shoulder Vertebral Column Knee Phalanges
Abduction is the movement..
away from the midline of the body
Adduction is the movement..
towards the midline of the body
Abduction and adduction happens at the..
Wrist
Hip
Shoulder
Circumduction is when the..
proximal end of the bone remains still. The distal end makes a circular action.
Rotation is the movement about a..
central axis
Circumduction and rotation happens at the..
shoulder&hip
atlas&vertebrae
axis&radio-ulnar
Supination is..
turning the hand so the palm is upward
facing anteriorly
Pronation is..
turning the hand so the palm is downward
facing posteriorly
Supination and pronation happens at the..
wrist
Horizontal flexion is the movement..
TOWARDS from the midline of the body in horizontal plane
Horizontal extension is the movement..
AWAY from the midline of the body in horizontal plane
Horizontal flexion and horizontal extension happens at the..
Shoulder & hip
Dorsiflexion is the movement that brings the..
top of the foot towards the shin
Plantar flexion is the movement that brings the..
sole of the foot downward
pointing toes
Dorsiflexion and plantar flexion happens at the..
ankle joint
Lateral flexion is the..
bending of the spine to the side
Lateral extension is the..
spine returning to anatomical position (normal)
Lateral flexion and lateral extension happens at the..
spine
Retraction is the..
backward (posterior) movement of the scapula (shoulder blade)
Protraction is the..
forward (anterior) movement of the scapula (shoulder blade)
Retraction and protraction happens at the..
shoulder girdle
Inversion is..
turning the foot so the sole faces inwards (medially)
Eversion is..
turning the foot so the sole faces outwards (laterally)
Inversion and eversion happens at the..
ankle joint
Elevation is when the..
scapula moves upwards
Depression is when the..
scapula moves downwards
Elevation and depression happens at the..
shoulder girdle