Sport Science: Muscle Origin and Insertion

Topics: Knee, Pelvis, Rectus abdominis muscle Pages: 5 (845 words) Published: December 6, 2012

In human anatomy, the deltoid muscle is the muscle forming the rounded contour of the shoulder. Anatomically, it appears to be made up of three distinct sets of fibers though electromyography suggests that it consists of at least seven groups that can be independently coordinated by the central nervous system. * Origin: upper clavicle, scapula

* Insertion: upper humerus

The superior or upper fibers of the trapezius arise from the external occipital protuberance, the medial third of the superior nuchal line of the occipital bone (both in the back of the head), and the ligamentum nuchae. The middle fibers of the trapezius arise from the spinous process of the seventh cervical (both in the back of the neck), and the spinous processes of the first, second, and third thoracic vertebrae. They are inserted into the medial margin of the acromion, and into the superior lip of the posterior border of the spine of the scapula. The inferior or lower fibers of the trapezius arise from the spinous processes of the remaining thoracic vertebrae. From this origin they proceed upward and laterally to converge near the scapula and end in an aponeurosis, which glides over the smooth triangular surface on the medial end of the spine. Origin: vertebrae

Insertion: clavicle, scapula

Pectoralis Major

Origin: clavicle, sternum
Insertion: humerus

Lattisimus Dorsi
It is the larger, flat, dorso-lateral muscle on the trunk, posterior to the arm, and partly covered by the trapezius on its median dorsal region. The latissimus dorsi is responsible for extension, adduction, transverse extension also known as horizontal abduction, flexion from an extended position, and (medial) internal rotation of the shoulder joint. It also has a synergistic role in extension and lateral flexion of the lumbar spine. Due to bypassing the scapulothoracic joint and attaching directly to the spine, the actions the lat has on moving the arm can also influence the movement of the scapula, such as their downward rotation during a pull up. Origin: vertebrae, scapula

Insertion: humerus

Biceps Brachii

Origin: scapula
Insertion: radius

Triceps Brachii
It is sometimes called a three-headed muscle because there are three bundles of muscles, each of different origins, joining together at the elbow. Though a similarly named muscle, the triceps surae, is found on the lower leg, the triceps brachii is commonly called the triceps. Origin: scapula

Insertion: ulna

Serratus Anterior
The serratus anterior is a muscle that originates on the surface of the second to ninth ribs at the side of the chest and inserts along the entire anterior length of the medial border of the scapula.

Origin: 8-9 ribs
Insertion: scapula

Rectus Abdominus
The rectus abdominis muscle, also known as "abs" or a "six pack", is a paired muscle running vertically on each side of the anterior wall of the human abdomen (and in some other animals). There are two parallel muscles, separated by a midline band of connective tissue called the linea alba (white line). It extends from the pubic symphysis, pubic crest and pubic tubercleinferiorly to the xiphoid process and costal cartilages of ribs V to VII superiorly. Origin: pubis

Insertion: sternum

External Oblique
The external oblique muscle (of the abdomen) (also external abdominal oblique muscle) is the largest and the most superficial (outermost) of the three flat muscles of the lateral anterior abdomen.

Origin: ribs...
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