The infraspinatus muscle is a thick, triangular muscle which occupies most of the concave, dorsal surface of the scapula, a part of the scapula called the infraspinatus fossa. In other words, this muscle covers almost the entire scapula (shoulder blade) below the scapular spine.
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The biceps brachii is a two-headed muscle located on the front of the arm, and makes up the largest part of its bulk. The name biceps is derived from the Greek word bi, meaning "two" and the Latin caput, meaning "head." The name brachii is a form of the Latin and Greek words brachialis and brachion, which describe something that pertains to the arm. Thus, biceps brachii means "two headed muscle of the arm." These two heads, one shorter than the other, arise from two separate origins which, although they partially combine into one large muscle, retain somewhat their separate features, both inserting together at the elbow.Bibliography item doyle not found.
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The teres major muscle is a small, round muscle lying along the lateral border of the scapula. It forms the inferior border of both the triangular space and quadrangular space. The muscle gets its name from its shape and size. Teres means "round" in Latin, and the term major refers to it being the larger of two muscles, the teres minor muscle lying just superior to the major. Both the teres major and minor are similar in shape, only the major is larger. It can be palpated in the trough between the lateral scapula and the latissumus dorsi, but is deeper than the lattisumus.
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The scalene muscles are three paired muscles of the neck, located in the front on either side of the throat, just lateral to the sternocleidomastoid. There is an anterior scalene (scalenus anterior), a medial scalene (scalenus medius), and a posterior scalene (scalenus posterior). They derive their name from the Greek word skalenos and the later Latin scalenus meaning "uneven", similar to the scalene triangle in mathematics, which has all sides of unequal length. These muscles not only have different lengths but also considerable variety in their attachments and fiber arrangements. As you will see from the descriptions below, these muscles are in a very crowded place and are related to many important structures such as nerves and arteries that run through the neck.
By Eric Troy, Ground Up Strength
The deltoid muscle is a large, triangular, course, and thick muscle which gives the shoulder its shape and contour. Its name is often reported to have derived from the Greek letter Delta (Δ) but it actually derives from the Latin word deltoides which means "triangular in shape or form" and was taken from the shape of the letter delta and the word eidos (oid) meaning shape or form. The deltoid is the principal abductor of the arm at the glenohumeral (shoulder) joint and also flexes and extends the humerus. The deltoid is the largest and probably the most important muscle of the shoulder complex. Bibliography item howell not found., Bibliography item doyle not found.
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The trapezius is a three part (tripartite) muscle of the upper back extending from the base of the skull all the way to the lower thoracic spine and laterally from the clavicle to the entire length of the spine of the scapula. Together the two trapezii form a diamond or kite-shaped trapezoid from which the muscle derives its name.
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The levator scapulae is a muscle located on each side of the neck, situated posteriorly1. It is named for its action in elevating or "lifting" the scapula and the word levator is the latin word for "to lift". This muscle is like the over-worked back-stage prop guy of the neck. Always in the shadow of the large sternocleidomastoid and hardly ever getting a moments rest.
Along with the trapezius, the levator scapulae works to shrug the shoulders by its raising of the medial margin of the scapula. If the scapula are fixed the muscles assist in cervical extension and if used alone flex the neck laterally to one side.
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This is an older post from the GUStrength's Blog.
I noticed a post about a study at Male Pattern Fitness1 that I would like to have reacted to but for some reason the comments are always closed kinda quickly at this blog so I wanted to comment on it here. I feel it may be a bit misleading.
Yes, I agree completely that most people train in a way that predisposes them to imbalances and injury. Such as the internal rotator dominance that was brought up in the post.
Continue Reading » Recreational Weight Training Makes You More Prone To Shoulder Injury?