General about skeletal system, joints and biomechanics Flashcards
Different name for bony fusion joint
Synostosis
Two types of cartilaginous joint
Synchondrosis and symphysis
Two types of fibrous joint
Syndesmosis and suture
What axis of rotation is allowed in the elbow?
Transverse axis
Why is there typically a notch in the middle of hinge (cylinder) joints?
It serves as a guide for the movement . Blocks lateral sliding
What motion does saddle joints have?
Biaxial
What motion does plane joints have?
Non-axial
What motion does hinge joints have?
Uniaxial
What motion does pivot joints have?
Uniaxial
What motion does condylar joints have?
Biaxial
What motion does ball and socket joints have?
Multiaxial
Which are the most common joints in our body?
Sinovial joints
What are synovial joints characterised by?
Freely moving
Articulating bony surfaces are covered in smooth (byline) articular cartilage and separated by a film og viscous synovial fluid (serves as lubricant)
What does the synovial membrane do?
Secretes and absorbs a fluid that lubricates the movement between the articulating surfaces
3 types of synovial joints
Simple
Compound
Complex
Can synovial joints be different kinds of joints (classified on shape/movement)?
Yes
2 non mobile joint
Suture
Syndesmoses
What is the terminal part of skeletal muscles?
Tendinous in nature
Angle of tendon and muscle fibers to which the tendon belongs
Pennation angle
What is the most superficial part of the bone?
Cortical bone
What is cortical bone formed by?
Compact bone tissue
What are the deep parts of the bone called
Spongy substance/bone
Trabecular substance/bone
What is spongy and trabecular bone formed by?
Spongy bone tissue
What is the cavity of bone that contains bone marrow called?
Medullary cavity
Name for bones that have air-filled cavities which are lined by mucosa
Pneumatic bones
3 examples of pneumatic bones
Ethmoid
Maxilla
Temporal
What is spongey tissue called in the cranium?
Diploë
Two main groups of joints?
Continuity joints
Contiguity joints
What are continuity joints?
Synarthroses
Immovable or semimovable
What are contiguity joints?
Diathroses or synovial joints
Moveable joints
What 3 things does synarthroses include?
Sutures
Symphyses
Synchondroses
What is synostosis?
When bones weld together
What are symphyses?
Joints where two bony segments are joined by fibrous cartilage and connective tissue
Example of symphyses joint
Joint between hipbones
What are synchondroses joints?
Hyaline cartilage interposed between the articular heads
Example of synchondroses joint
Joint between first rib and sternum
3 structures that together with supporting structures form diarthroses/synovial joints
Articular heads
joint capsules
Articular cavity
What are simple joints?
Synovial joints which present only 2 articular heads enclosed in a capsule
What are compound joints?
Synovial joints that present more articular heads included into the joint capsule (like elbow joint)
Different name for ball and socket joints
Spherodial joints
Different name for condylar joints
Ellipsoid joints
Different name for pivot joints
Throcoid joints
Different name for hinge joints
Trochleae
What is the articular surface of joints covered by?
Hyaline cartilage
Which are the movements on the transverse axis?
Flexion and extension
Which are the movements on the saggital axis?
Lateral inclination when referring to head and trunk
Abduction and adduction when referring to limbs
Which are the movements on the longitudinal axis?
Torsion when involving vertebral column
Rotation when involving the limbs
What is the articular cavity?
A very narrow space in the shape of a fissure
What does the articular cavity contain?
Synovial fluid
2 functions of synovial fluid
Lubricating
Maintenance of the articular cartilages
What are peripheral ligaments?
Ligaments embedded into the capsule
What are remote ligaments?
Ligaments that pass a remarkable distance from the joint
3 classes of muscles
Long muscles
Large/flat muscles
Short muscles
Different name for superficial muscles
Cutaneous
Different name for deep muscles
Subfascial
Where are cutaneous muscles located?
Immediately under the skin with at least one end attached to the dermis
Where are the superfascial muscles located?
Below the superficial fascia (contained in hypodermis)
Names of the 2 insertion points
Moveable point
Fixed point
What happens to the two insertion points during contraction?
The moveable point moves towards the fixed point which remains stationary
Do some muscles have two moveable points?
Yes
2 ways of muscle insertion
Directly
By means of a tendon
What are muscles called when their insertion happens via more than one tendon?
Bicaudate
Tricaudate
Polycaudate
What is the course of the tendon fibers in comparison to the axis of the muscles with parallel fascicles?
Parallel
What is the course of the tendon fibers in comparison to the axis of the muscles with oblique fascicles?
Oblique