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Biology 2nd Baccalaureate

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10.2.1. Muscles of the human body

Muscles of the human body

Some of the most important muscles in the human body, according to their location and function, are:

Head muscles

  • Masseters: muscles that we use in chewing.
  • Orbicularis of the lips: they allow the movement of the lips when we speak.
  • Orbicularis of the eyelids: to open and close the eyelids.
  • Buccinators: they allow blowing, hissing, chewing, etc.
  • Front: raise the eyebrows and wrinkle the forehead.
  • Nasalis: allows to move the nose slightly.
  • Laughing: they stretch their lips.

Músculos de la cabeza y cuello

By Me (Image:Illu_head_neck_muscle.jpg) [Public domain], via Wikimedia Commons

Neck muscles

  • Sternocleidomastoids: allow to move the head sideways and forward.
  • Splenium: to move the head back.

Trunk muscles

  • Intercostals: involved in breathing.
  • Diaphragm: between the abdomen and the thorax, it intervenes in breathing.
  • Pectorals majors: in front, it allows to move the arms.
  • Rectus majora: flexion of the trunk.
  • Traps: from behind, raise the shoulder and keep the head vertical.
  • Dorsal: allow to move the arm backwards.

Arm muscles

  • Delts: forms the shoulder. Raise your arm and move it back and forth.
  • Biceps Brachii: flex the forearm over the arm .
  • Triceps brachii: extend the forearm.
  • Pronators and supinators: rotate the wrist and hand.
  • Flexors and extensors of the fingers.

Experiments with your body: fingers that relax.

Experiments with your body: The arm that shortens.

Experiments with your body: The arm that goes up alone.

Leg muscles

  • Buttocks: form the buttocks. They maintain the erect position of the body.
  • Sartorius: allows you to cross your legs.
  • Crural biceps: from behind, bend the leg at the knee.
  • Crural quadriceps: in front, extend the leg.
  • Twins: they form the calf, they are used to walk. They end in the Achilles tendon (or calcaneus).
  • Flexors and extensors of the fingers.

Músculos esqueléticos

By Skeletal_muscles_homo_sapiens.JPG: KVDPderivative work: OSH FPaD (Skeletal_muscles_homo_sapiens.JPG) [Public domain], via Wikimedia Commons


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