Muscles and Motion in Human Anatomy

These flashcards cover key muscles and their functions in human anatomy, focusing on actions, origins, and insertions.

What are the main muscles involved in the rotator cuff?

Supraspinatus, Infraspinatus, Teres Minor, and Subscapularis.

What is the function of the supraspinatus muscle?

It helps in abducting and lifting the arm.

What action do the trapezius muscles perform?

They assist in lifting and rotating the shoulder.

What is the primary action of biceps brachii?

Flexion of the elbow.

Identify the origin and insertion of the pectoralis major muscle.

Originates on the clavicle and sternum, inserts on the intertubercular groove of the humerus.

What muscles are referred to as the 'sitz group'?

The rotator cuff muscles: Supraspinatus, Infraspinatus, Teres Minor, and Subscapularis.

What is the primary muscle for hip flexion?

Iliopsoas group, including iliacus and psoas major.

What muscle is responsible for the extension of the elbow?

Triceps brachii.

What is the main function of the diaphragm during breathing?

It contracts to allow inhalation and relaxes to allow exhalation.

What do the external intercostals do during respiration?

They elevate the ribs during inhalation.

What is the action of the hamstring group during leg movement?

They flex the knee.

What is the role of flexor carpi radialis?

It flexes the wrist.

Name the muscles that make up the quadriceps femoris group.

Rectus femoris, Vastus lateralis, Vastus medialis, and Vastus intermedius.

What action do the gluteus maximus muscles perform?

They extend and laterally rotate the hip.

Explain the function of the gastrocnemius muscle.

It acts to plantar flex the foot and helps in running and jumping.

What is the antagonist to the biceps brachii?

Triceps brachii.

What is the primary function of the tensor fascia latae?

It stabilizes and helps swing the leg outward.