Skeletal muscles are responsible for voluntary contractions. (1) Deltoid (2) Pectoralis major (3) Serratus anterior (4) Latissimus dorsi (5) Trapezius
What are the characteristics of the following muscles?
The followings are skeletal muscles responsible for the voluntary contraction of different bone structures.
Deltoid (1)
- Origen ⇒ Three origen point ⇒ the clavicle, acromion, and scapula.
- Function ⇒ This muscle is involved in the shoulder movement.
- The clavicular region is a flexor, slightly abductor and internal rotator.
- The acromial part is an abductor.
- The spinal region is extensor, abductor, adductor and external rotators.
Rhomboideus
- Origen ⇒ Scapular vertebral edge
- Function ⇒ Scapula abductor, rotator and elevator.
Serratus anterior (3)
- Origen ⇒ Internal scapular vertebral edge
- Function ⇒ Scapula separation, rotation
Pectoralis major (2)
- Origen ⇒ Anterior face of the clavicle, sternocostal articulations, and costal cartilage.
- Function ⇒ depends on the region
- The clavicular region is a flexor, slightly abductor and internal rotator.
- The sternocostal portion is an abductor and rotator
- The costal cartilage region is an extensor.
Trapezius (5)
- Origen ⇒ cervical and dorsal vertebrae
- Insertion ⇒ the clavicle, acromion, and scapula
- Function ⇒ scapula elevation, adduction, and rotation. Clavicle traction.
Latissimus dorsi (4)
- Origen ⇒ from the seventh dorsal vertebra to the sacrum dorsal crest.
- Insertion ⇒ In the humerus
- Function ⇒ Involved in the arm movement. Abduction, extension, and rotation.
The labels in the picture are,
(1) Deltoid
(2) Pectoralis major
(3) Serratus anterior
(4) Latissimus dorsi
(5) Trapezius
You can learn more about body skeletal muscles at
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