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The trapezius [4] is a large paired trapezoid-shaped surface muscle that extends longitudinally from the occipital bone to the lower thoracic vertebrae of the spine and laterally to the spine of the scapula. It moves the scapula and supports the arm. The trapezius has three functional parts: an upper (descending) part which supports the weight ...
The spinal component of the accessory nerve provides motor control of the sternocleidomastoid and trapezius muscles. [8] The trapezius muscle controls the action of shrugging the shoulders, and the sternocleidomastoid the action of turning the head. [8] Like most muscles, control of the trapezius muscle arises from the opposite side of the ...
trapezius, ascending part Upper limb, Vertebral column, Right/Left down midline, external occipital protuberance, nuchal ligament, medial part of superior nuchal line, spinous processes of vertebrae C7-T12: at shoulders, lateral third of clavicle, acromion of scapula, spine of scapula: transverse cervical artery: motor: accessory nerve [CNXI]
In geometry, a trapezoid (/ ˈ t r æ p ə z ɔɪ d /) in North American English, or trapezium (/ t r ə ˈ p iː z i ə m /) in British English, [1] [2] is a quadrilateral that has one pair of parallel sides.
Apart from the above neck muscles, the following muscles have also been observed contributing to respiration: serratus anterior, pectoralis major and pectoralis minor, trapezius, latissimus dorsi, erector spinae, iliocostalis, quadratus lumborum, serratus posterior superior, serratus posterior inferior, levatores costarum, transversus thoracis ...
Apex: Union of the sternocleidomastoid and the trapezius muscles at the superior nuchal line of the occipital bone. Anteriorly: Posterior border of the sternocleidomastoideus. Posteriorly: Anterior border of the trapezius. Inferiorly: Middle one third of the clavicle. Roof: Investing layer of the deep cervical fascia. Floor: (From superior to ...
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The medial cutaneous branches of the posterior divisions of the thoracic nerves descend for some distance close to the spinous processes before reaching the skin, while the lateral branches travel downward for a considerable distance—it may be as much as the breadth of four ribs—before they become superficial; the branch from the twelfth thoracic, for instance, reaches the skin only a ...