Anatomy 7 - Movement Flashcards
3 different types of muscle?
Voluntary?
Striated?
Cardiac muscle (involuntary and started) Smooth muscle (involuntary and non-striated) Skeletal muscle (voluntary and striated)
What is skeletal muscle made up of?
Skeletal muscle -> fasciles -> muscle fibre (myocyte/ muscle cell) -> myofibrils -> actin and myosin microfilaments
Why does striations look like stripes?
Due to overlapping actin and myosin
What happens when a muscle is strained?
Some of the muscle fibres are torn
Types of skeletal muscles? (5)
Circular Pennate Fusiform Flat with aponeurosis Quadrate
Example of a circular muscle
Orbicularis oculi
Example of a pennate muscle
Deltoid
Example of fusiform muscle
Biceps brachi
Example of a flat muscle
External oblique
Example of a quadrate muscle?
Rectus abdominus
What is a flattened tendon called?
An aponeurosis
What are the 2 points at which muscle attaches to bone called?
Origin(s)
Insertion(s)
(origin is a fixed point where as the insert moves with contraction)
How many origins and insertions does biceps brachi have?
2 origins
1 insertion
Along which axis does a muscle contract?
Long axis
Which joints can biceps brachii move?
Shoulder
Elbow
Radioulnar joint(as spans all 3 of these joints)
What is a reflex?
A rapid, predictable, involuntary reaction to “danger”