What is the action of the Serratus anterior muscle?
It rotates the scapula laterally and upwards.
Where does the Pectoralis major muscle originate and insert?
It originates on the clavicle, sternum, and cartilage of ribs 1-6 , and inserts on the humerus.
Which muscle extends, adducts, and medially rotates the arm, and originates on the spines of vertebrae T7-L5, lower 4 ribs, and the iliac crest?
Latissimus dorsi
What are the actions of the Trapezius?
It adducts and retracts the scapula; it also depresses the scapula and shoulder.
The Deltoid muscle originates on the scapula spine and acromion and lateral clavicle. Where does it insert, and what is its action?
It inserts on the humerus deltoid tuberosity , and its actions are arm flexion, abduction, and medial rotation
Which muscle originates in the scapula supraspinous fossa, inserts on the humerus greater tubercle, and acts to stabilize the shoulder?
Supraspinatus
What are the action(s) of the Subscapularis?
Stabilize the shoulder and medial arm rotation.
What is the origin and action of the Infraspinatus?
Originates on the scapula infraspinous fossa and its actions are to stabilize the shoulder and lateral arm rotation.
What are the actions of the Teres major?
Arm extension, adduction, and medial rotation.
The Biceps brachii inserts on the radial tuberosity. What are its two primary actions?
Elbow flexion and supination
Which muscle originates on the humerus front, distal, inserts on the ulna coronoid process, and primarily causes elbow flexion and stabilization?
Brachialis.
What is the action of the Triceps brachii?
Elbow extension and arm adduction
Which muscle is responsible for forearm pronation?
Pronator teres
The Supinator is responsible for what action?
Forearm supination.
What is the action of the Flexor carpi radialis?
Wrist flexion and abduction
Which muscle extends and abducts the wrist?
Extensor carpi radialis
What muscle extends the wrist and finger and originates on the humerus lateral epicondyle?
Extensor digitorum
The Sartorius is often called the “tailor’s muscle” because of its actions. What are its actions?
Thigh flexion, abduction, and lateral rotation.
Which muscle works with the psoas major to perform thigh flexion and vertebral lateral flexion?
Iliacus
What is the general action of the Adductor group?
Thigh adduction and medial rotation.
Which powerful posterior hip muscle is responsible for thigh extension, abduction, and lateral rotation?
Gluteus maximus.
What are the two general actions of the Hamstring group?
Thigh extension and knee flexion
All muscles in the Quadriceps group perform which primary action?
Knee extension.
What are the actions of the Tibialis anterior?
Foot dorsiflexion and inversion.
