Rhomboid major vs minor

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Rhomboid major vs minor

In human anatomy, the rhomboid minor is a small skeletal muscle of the back that connects the scapula to the vertebrae of the spinal column. It is innervated by the dorsal scapular nerve. It acts together with the rhomboid major to keep the scapula pressed against the thoracic wall. The rhomboid minor arises from the inferior border of the nuchal ligament , from the spinous processes of the vertebrae C7—T1, and from the intervening supraspinous ligaments. It inserts onto a small area of the medial border of the scapula at the level of the scapular spine. It is innervated by the dorsal scapular nerve a branch of the brachial plexus , with most of its fibers derived from the C5 nerve root and only minor contribution from C4 or C6. The rhomboid minor receives arterial blood supply from the dorsal scapular artery. It is located inferior to levator scapulae , and superior to rhomboid major. It lies deep to trapezius , and superficial to the long spinal muscles. It is usually separated from the rhomboid major by a slight interval, but the adjacent margins of the two muscles are occasionally united. Together with the rhomboid major, the rhomboid minor retracts the scapula when trapezius is contracted.

Terminologia Anatomica. Entrapment of the dorsal scapular nerve is the most frequent cause, but the exact location of entrapment has not been specified.

The rhomboid major is a skeletal muscle of the back that connects the scapula with the vertebrae of the spinal column. As the word rhomboid suggests, the rhomboid major is diamond-shaped. The major in its name indicates that it is the larger of the two rhomboids. The rhomboid major arises from the spinous processes of the thoracic vertebrae T2—T5 as well as the supraspinous ligament. It inserts on the medial border of the scapula , from about the level of the scapular spine to the scapula's inferior angle. The rhomboid major, like the rhomboid minor, is innervated by the ventral primary ramus via the dorsal scapular nerve C5. Both rhomboid muscles also derive their arterial blood supply from the dorsal scapular artery.

The deep muscles develop embryologically in the back, and are thus described as intrinsic muscles. The superficial and intermediate muscles do not develop in the back, and are classified as extrinsic muscles. This article is about the anatomy of the superficial back muscles — their attachments, innervations and functions. The superficial back muscles are situated underneath the skin and superficial fascia. They originate from the vertebral column and attach to the bones of the shoulder — the clavicle, scapula and humerus. All these muscles are therefore associated with movements of the upper limb. The muscles in this group are the trapezius, latissimus dorsi, levator scapulae and the rhomboids. The trapezius and the latissimus dorsi lie the most superficially, with the trapezius covering the rhomboids and levator scapulae. The trapezius is a broad, flat and triangular muscle. The muscles on each side form a trapezoid shape.

Rhomboid major vs minor

The Rhomboid Major and Rhomboid Minor are two separate muscles that work together to attach the scapula to the spine. The Rhomboid Minor is located above the Rhomboid Major and performs the same function and action within the body. The Rhomboids play a key role in the stability of the scapula and are important for any upper limb movement. The Rhomboid Major and Rhomboid Minor are classified as skeletal muscles and are located underneath the trapezius in the upper back. The Rhomboid Major is thinner and flatter and twice as wide as the Rhomboid Minor, however both muscles resemble the shape of a Rhomboid.

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It coursed deep to the trapezius and inserted into the insertions of the rhomboid major and minor muscles at the level of the spine of the scapula. Begin sitting on the edge of a chair with your legs at degree angles. Cards Cards. Techniques Techniques. The trapezius has evolved separately, but the other muscles in this group evolved from the first eight or ten ribs and the transverse processes of the cervical vertebrae homologous to the ribs. The rhomboideus capitis in man--correctly named rare muscular variation. Wikimedia Commons. With the assistance of many other muscles, the rhomboids help form the shoulder girdle. Despite these differences, the embryonic origin of the rhomboids correlates to their respective nerve supply, as is the case with other muscles of the shoulder and upper limb. Authority control databases Terminologia Anatomica. Both rhomboids receive innervation from the dorsal scapular nerve, and their vascular supply the dorsal scapular artery. The rhomboids are a collective group of muscles formed by the rhomboid major and minor. It follows the medial levator scapulae before inserting on the medial scapula opposite the scapular spine. Archived from the original on 22 October Moore MD.

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Tools Tools. Somitic origin of the medial border of the mammalian scapula and its homology to the avian scapula blade. Epub Oct 3. Anat Rec. It is usually separated from the rhomboid major by a slight interval, but the adjacent margins of the two muscles are occasionally united. Rhomboid Minor and Major. It follows the medial levator scapulae before inserting on the medial scapula opposite the scapular spine. In primitive life forms, the main function of the axioscapular group is to control the movements of the vertebral border of the scapula: fibers concerned with the dorsal movement of scapula evolved into the rhomboids, those with ventral motion into serratus anterior, and those with cranial movements into levator scapulae. Surgical treatment of winged scapula. Cancel Attach. Comment on this article. There have been three reported cases of an additional rhomboid muscle discovered in humans.