Skeletal muscles are voluntary muscles that are attached to bones and allow for movement of the body. There are several groups of skeletal muscles that control movement in the legs, arms, trunk, neck, and face. The functions of skeletal muscles include force production for locomotion, maintaining posture, stabilizing joints, and generating heat. Some major skeletal muscles are the gluteus maximus and quadriceps in the legs, the deltoids and biceps in the arms, the abdominal and back muscles in the trunk, and the facial muscles that control expression. [/SUMMARY]

1. Skeletal Muscles in the
Body
University of Georgia
Public health and health science
Dentistry faculty
By :abdullah saad

2. An introduction :
•Skeletal muscles are voluntary muscles that move your
bones. You have control over them, unlike smooth muscle
that works on organs or the cardiac muscle of your heart,
both of which work without you having to think about them.
Skeletal muscle is also called striated muscle because it has
a striped appearance. There are several groups of skeletal
muscles that move your legs, arm, trunk, neck and face.
•Skeletal muscles have transverse striations and are under
conscious or voluntary control by the somatic nervous
system.

3. What Are the Functions of Skeletal
Muscles?
•Skeletal muscles are used for locomotion to allow the body
movement and also to make a person to be able to be flexible.
The skeletal muscles aid in walking, nodding and also produce
movement. They also maintain posture, stabilise joints as well
as generate heat.
•The functions of skeletal muscle include force production for
locomotion and breathing, and force production for postural
support. These muscles also help in heat production during
cold stress. The human body contains about 400 skeletal
muscles, which is approximately 40-50% of total body weight.

5. Major Muscles of the
Lower Limbs:
• Several major skeletal muscles move your
pelvis, femur (thigh bone), tibia and fibula
(lower leg bones), and the bones of the
foot and ankle. The gluteus maximus
forms your buttocks and straightens your
hips when you stand. The iliopsoas bends
your hips. Quadriceps muscles straighten
your knee, and the hamstrings bend your
knee. Calf muscles called soleus and
gastrocnemius lift your heel off the
floor, and tibialis anterior moves your foot
up and back toward your leg. extensor
and flexor muscles moSmaller ve your
toes.

6. Major Muscles of the
Upper Limbs
• The major muscles of the upper limbs
move your humerus (upper arm
bone), radius and ulna (lower arm
bones) and the bones of the wrist and
hand. Deltoid muscles form the caps
of your shoulders and move your
upper arm in several directions.
Triceps brachii forms the back of your
upper arm and straightens your elbow.
Your biceps brachii forms the front of
your upper arm and bends your elbow.
Wrist flexors and extensors bend and
straighten your wrist, and many small
muscles move your hand and finger
bones.

7. Major Muscles
of the Trunk:
• Major muscles of the trunk include
the abdominal, back and chest
muscles. Rectus abdominus forms
the "six pack" of your abdomen and
bends your trunk at the waist. The
obliques form the sides of your
abdomen and twist your trunk.
Trapezius, rhomboids and latisimus
dorsi form your upper back and
help move your shoulders. The
pectoral muscles shape your chest
and help move your upper arms.
Erector spinae muscles straighten
your back.

8. Major Muscles of the
Neck and Face
• The scalenes and
sternocleidomastoids turn and bend
your neck forward. Capitis and
cervicis muscle groups bend your
neck backward. Facial muscles
include the muscles of expression
that surround your mouth, eyes and
nose. The orbicularis oris muscle
surrounds your mouth and the
buccinator tightens your cheek when
you smile. The orbicularis oculi
surround the eyes and close your
eyelids.

10. THE END
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