Anatomy and Physiology 1.1a Flashcards
Structure of Ligament?
Tough band of slightly elastic connective tissue
Function of Ligament?
Connects bone to bone and stabilises joints
Structure of Synovial Fluid?
Lubricating liquid contained within the joint cavity
Function of Synovial Fluid?
Reduces friction and nourishes articular cartilage
Structure of Cartilage?
Smooth tissue which covers the surface articulating bones
Function of Cartilage?
Absorbs shock and allows friction-free movement
Structure of Capsule?
A fibrous sac with inner synovial membrane
Function of Capsule?
Encloses and strengthens the joint secreting synovial fluid
Three Planes of Movement?
Saggital, Frontal and Transverse
Saggital Plane?
Divides the body into left and right
Frontal Plane?
Divides the body into anterior/posterior (back/front)
Transverse Plane?
Divides body into upper and lower
Movements in Saggital Plane?
Flexion
Extension
Dorsi Flexion
Plantar Flexion
Movements in Frontal Plane?
Abduction
Adduction
Movements in Transverse Plane?
Horizontal extension
Horizontal flexion
Rotation
Ball and Socket Joint?
Shoulder and Hip
Hinge Joint?
Elbow, Knee and Ankle
Condyloid Joint?
Wrist
Saggital Movement at Ball and Socket?
Flexion and Extension
Frontal Movement at Ball and Socket Joint?
Abduction and Adduction
Transverse Movement at Ball and Socket Joint?
Horizontal Flexion and extension and Dorsi/Plantar Flexion
Saggital Movement at Hinge Joint?
Flexion and Extension and Dorsi/Plantar Flexion
Agonist muscle function?
Shorten to create movement
Antagonist Muscle function?
Lengthens to coordinate movement
Type of Flexion at Wrist?
Wrist Flexors - Agonist
Wrist Extensors - Antagonist
Type of Flexion at Elbow?
Biceps Brachii - Agonist
Triceps Brachii - Antagonist
Type of Flexion at Shoulder?
Anterior Deltoid - Agonist
Posterior Deltoid - Antagonist
Type of Flexion at Hip?
illiopsoas - Agonist
Gluteus Maximus - Antagonist
Type of Flexion at Knee?
Biceps Femoris - Agonist
Rectus Femoris - Atagonist
Type of Flexion at Ankle?
Tibialis Anterior - Agonist
Gastrocnemius - Antagonist
Types of Muscle Contraction?
Concentric, Eccentric and Isometric
Concentric?
Muscles Shortens to produce tension
Eccentric?
Muscle Lengthens to produce tension
Isometric?
Muscle contracts but does not change length and no movement is created
Muscle contraction steps
- Nerve Impulse Initiated
- NI conducted down Axon to synaptic Cleft
- Neurotransmitter called Acetylcholine secreted into synaptic cleft to conduct nerve impulse across gap
- If charge is above threshold then contraction
What are Motor Neurones?
Specialised cells which transmit nerve impulses
3 Types of Fibre Types?
Slow Oxidative - SO
Fast Oxidative Glycolytic - FOG
Fast Glycolytic - FG
Slow Oxidative Structural Characteristics?
Neutron size SMALL Fibres per Neuron FEW Capillary Den HIGH Mitochondria Dens HIGH Myoglobin Dens HIGH Phosphocreatine LOW
Slow Oxidative Functional Characteristics?
Contraction Speed Slow Contraction Force Low Fatigue Resistance High Aerobic Capacity High Anaerobic Capacity Low
Fast Oxidative Glycolytic Structural Characteristics?
Neutron size Large Fibres per Neuron Many Capillary Den High Mitochondria Dens Moderate Myoglobin Dens Moderate Phosphocreatine High
Fast Oxidative Glycolytic Functional Characteristics?
Contraction Speed Fast Contraction Force High Fatigue Resistance Moderate Aerobic Capacity Moderate Anaerobic Capacity Moderate
Fast Glycolytic Structure Characteristics?
Neutron size Large Fibres per Neuron Many Capillary Den Low Mitochondria Dens Low Myoglobin Dens Low Phosphocreatine High
Fast Glycolytic Functional Characteristics?
Contraction Speed Fast Contraction Force High Fatigue Resistance Low Aerobic Capacity Low Anaerobic Capacity High
What do Motor Neurones consist of
- Nerve cells (brains or spinal cords)
- Transmit nerve impulses to a group of muscle fibres
Motor end plates
-connect group of muscle fibres to the axon of motor neurones
Axon
-extension of motor neurones that connect the main cell and muscle fibres
Motor Unit
- Motor neurone and the muscle fibres that it activates
- Strength of contraction is determined by how many units are recruited
All or None law
-Either all muscle fibres contract or not
Action Potential
-postive electrical charge inside nerve/muscles cells which conducts nerve impulse down motor neurone into muscle fibres
Neuromuscular junction
-point where axons motor end plates meet muscle fibre
Synaptic Cleft
-gap between motor plate and muscle fibre
Neurotransmitter
- Action potential cannot cross synapse without Acetylcholine
- secreted by neurone in synapse helping action potential