iopsounds.blogg.se - Scapula spine

#SCAPULA SPINE PLUS#

The portion above is known as the supraspinous fossa, while the part below is called the infraspinous fossa. It is divided into two unequal parts by the spine of the scapula. The dorsal surface of the scapula is arched from above downward. Also, ridges or lines of muscle attachment can be seen on the anterior surface. It is marked by the subscapular fossa, to which the subscapularis muscle attaches. The anterior or costal surface of the scapula is slightly concave and projects forward. The scapula is a flat bone that has two surfaces: This foramen serves as a passage for the suprascapular nerve. It is marked by a deep, semicircular notch on its lateral part, called the scapular notch, which is converted into a foramen by the superior transverse scapular ligament. The superior margin (or superior border, upper border) is the shortest and thinnest of all three. The lateral margin also gives origin to the subscapularis and teres minor, and even to a few fibers of the teres major. This margin is marked by a rough impression known as the infraglenoid tuberosity, which serves as the origin site for the long head of the triceps brachii. It starts at the lower margin of the glenoid cavity above, inclines obliquely downward and backward, reaching the inferior angle of the scapula. The lateral margin (also lateral border, or axillary border) is the thickest of the three margins. Four muscles attach to the medial margin of the scapula - the serratus anterior, levator scapulae, rhomboid minor, and rhomboid major. The medial margin (also called the medial border, or vertebral border) is the longest of the three margins, extending from the superior angle to the inferior angle.

superior margin, which is marked by the scapular notch.

The three margins (or borders) of the scapula are: The scapula has three margins, two surfaces, and three angles. It is positioned on the posterolateral aspect of the thoracic cage. Together with the clavicle, the scapula forms the shoulder girdle. The name “scapula” derives from Latin, meaning “trowel” or “small shovel,” which it seemed to resemble. The scapula is also known as the shoulder bone, shoulder blade, wing bone, and blade bone. Instead, it may become overstretched.The scapula (Latin: scapula) is a flat triangular bone that connects the humerus and the clavicle. In this and similar, albeit less dramatic, scenarios, the levator scap may not be strong enough to keep the shoulder blade where it's supposed to be for good head on neck posture. In this case, dynamic opposing movements would likely require your muscles and bones to both shift independently and to work together to enable you to type, reach for your cell phone and manage your balance as the water surges underneath you. To understand what a movable shoulder blade may do to your levator scap, which is assigned to keeping it in the right position on your back, imagine standing on a surfboard in the ocean while holding and using your electronic equipment and other office supplies. Keeping it steady in order to maintain appropriate neck posture is no easy feat. īut the shoulder blade is, by nature, an extremely movable bone. One of the primary functions of the levator scap is to keep your shoulder blade in a position that supports a vertical alignment of your head on your neck, and to prevent forward head posture, a condition in which your head is too far forward.

#SCAPULA SPINE PLUS#

Poorly designed work furniture may contribute to chronic muscle tension and spasm, plus muscle weakness. The levator scap originates from the cervical vertebra one through four (C1 to C4) and attaches to the inside top edge of the scapula. It participates in side bending, which is called lateral flexion, and rotation, or twisting. Levator scapula muscle contraction can also move the neck. Flexion occurs when you move your arm forward and up towards the ceiling, and abduction occurs when you move your arm out to the side.ĭuring flexion and/or abduction, the levator scap is actively contracting.

These shoulder blade movements are generally part of the larger movements of flexion and abduction of the shoulder joint. This is the downward rotation movement mentioned above. It also rotates the scapula downward.īy pulling upward from the inner corner of the scapula bone towards the outside of the neck, where the levator scapula attaches, this muscle indirectly moves the bottom tip of the scapula towards the spine. The levator scap brings the shoulder blade, or scapula, up, which is a movement that is called elevation.

There are two scapula bones, one on either side of the spine, in back.