PSK4U1 Final Exam Flashcards - Muscles Review

Name and Function (Ch. 6)

Sternocleidomastoid

Singly (one side): rotates head to opposite side

Both sides: flexes neck

Rectus Abdominis

Flexes trunk/vertebral column and aids in expiration, defecation and childbirth

Pectoralis Major

Adducts, flexes and internally rotates arm/shoulder

Latissimus Dorsi

Adducts, extends and internally rotates arm and pulls arms downward/backward, helps extend, adduct, and rotate the shoulder.

Trapezius

Elevates, adducts, rotates, and depresses scapula, extends neck

Deltoid

Anterior: flexes and medially rotates arm

Lateral: abducts arm

Posterior: extends and laterally rotates arm

Biceps Brachii

Supinates forearm, flexes elbow

Triceps Brachii

Extends elbow

Gluteus Maximus

Extends and externally rotates hip

Iliopsoas (Iliacus & Psoas Major)

Flexes hip

Rectus Femoris

Flexes hip, extends knee (2 joints!)

Vastus Lateralis

Extends knee

Vastus Intermedius

Extends knee

Vastus Medialis

Extends knee

Biceps Femoris

Extends hip and flexes knee (2 joints!)/externally rotates flexed knee

Semimembranosus

Extends hip/flexes and internally rotates knee (2 joints!)

Semitendinosus

Extends hip/flexes and internally rotates knee (2 joints!)