Editor’s note: Replace figure with one that includes all muscles from table for example figure 10.7 from Marieb or 9.8 from Amerman. 2 This article will primarily highlight the origin , insertion , innervation and function of the intrinsic muscles of the shoulder. Examples include: Zygomaticus: This muscle is involved in facial expression and … The name ‘rectus abdominis’ means ‘straight abdominal’, and is indicative of the parallel direction the fibres of the muscle take as they pass from their origin to their point of insertion. The scalene muscles are a group of three pairs of muscles in the lateral neck, namely the anterior scalene, middle scalene, and posterior scalene.They are innervated by the fourth, fifth, and sixth cervical spinal nerves (C4-C6).. Myoclonus Describes a symptom and generally is not a diagnosis of a disease. However, the little research that does exist about detraining in general proposes that the most dramatic reduction in fitness occurs within a 10-28 day window. The orbicularis oris is a circular muscle that moves the lips, and the orbicularis oculi is a circular muscle that closes the eye. The occipitofrontalis muscle elevates the scalp and eyebrows. The muscles that control breathing and neck and limb movements may also be affected. Origin and insertion. Since the sport requires a variety of movements, different bones, joints and muscles are stressed with each specific skill in volleyball. The pectoralis major (from Latin pectus 'breast') is a thick, fan-shaped or triangular convergent muscle, situated at the chest of the human body.It makes up the bulk of the chest muscles and lies under the breast.Beneath the pectoralis major is the pectoralis minor, a thin, triangular muscle.The pectoralis major's primary functions are flexion, adduction, and internal rotation of the humerus. In general, the muscles used for bench press are the pecs, shoulders, and triceps. While the reduction in aerobic fitness has been tolerably studied in an applicable manner, the effect of detraining on specific running muscles has been harder to find. The muscles in this area control movement of the face, head, and neck. weakness at the shoulder, making lifting the arm above the head difficult; tripping up over a foot because of weakness at the ankle or hip; These symptoms are usually painless and may be accompanied by widespread twitching of the muscles (fasciculations) or muscle cramps, and there may be visible wasting of the muscles with significant weight loss. These are the muscles that contribute to pressing the bar in the vertical plane of motion. They are one of the two pairs of muscles that contribute to the anterior abdominal wall. The muscles used for bench press will change based on the angle of the bench (flat, decline, incline), grip on the bar (narrow or wide), and range of motion trained (bottom-end or top-end).. The rectus abdominis muscle is composed of a pair of vertically oriented muscles. The intrinsic muscles can be further divided into the deltoid muscle, teres major and the rotator cuff muscles; supraspinatus, infraspinatus, subscapularis and teres minor. Certain muscles such as those that control eye and eyelid movement, facial expression, chewing, talking, and swallowing are often, but not always, involved in the disorder. Here we will look at and break down the muscles and joints required to make a pass and take a look at arm swing and common injuries occurred from "spiking".

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