lab 8 Flashcards
Typically proximal to the body’s center of gravity
Origin
Being further away from the center of gravity; typically the moveable end of the muscle
Insertion
When the muscle contracts, it causes skeletal movement
Muscle action
What are the 6 common movements a body can perform
1.Flexion
2.Extension
3.Abduction
4.Adduction
5.Rotation
6.Circimduction
Decrease in angle of a joint, typically anterior/posterior
Flexion
Increase in the angle of a joint, typically back to anatomical position
Extension
Lateral movement away from the body
Abduction
Adduction
Medial movement towards the body
Rotation
Circular movement around a bones long axis
Circumduction
Circular movement around a fixed base
What is the Origin of the muscle Trapezius
Occipital bone and vertebrae
What are the insertions of the muscle trapezius
Scapula and clavicle
What is the action of the trapezius
It stabilizes and raises scapula
What is the origin of the muscle sternocledomastoid
Sternum and clavicle
What are the insertion of sternocledomastoid
Mastoid process of temporal bone
What are the actions of sternocledomastoid
Flexes and rotates head
What is the origin for pectoralis major
Clavicle, sternum, and ribs
What is the insertion of pectoralis major
Humerus
What are the actions of the pectoralis major
Flexes and abducts arm
What is the origin for the deltoid muscle
Clavicle and scapula
What is the insertion of the deltoid muscle
Humerus
What is the action of the deltoid muscle
Adduction arm
What is the origin of latissimus Dorsi
Vertebrae, ribs, Ilium
What are the insertions of latissimus dorsi
Humerus
What are the actions of the latissimus dorsi
Extends and abducts arm