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An accessory muscle can also refer to a muscle that is not primarily responsible for movement but does provide assistance. [1] Examples of such muscles are the accessory muscles of respiration where the sternocleidomastoid and the scalene muscles (anterior, middle and posterior scalene) are typically considered accessory muscles of respiration. [6]
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Accessory muscles of respiration are muscles that assist, but do not play a primary role, in breathing. Use of these while at rest is often interpreted as a sign of respiratory distress . [ 3 ] There is no definitive list of accessory muscles, but the sternocleidomastoid and the scalenes (anterior, middle, and posterior) are typically included ...
The epitrochleoanconeus muscle (anconeous epitrochlearis muscle, anconeus-epitrochlearis or anconeus sextus) is a small accessory muscle of the arm which runs from the back of the inner condyle of the humerus over the ulnar nerve to the olecranon. The average prevalence of this muscle is 14.2% in healthy individuals.
The muscle fibers are directed downwards, forwards and laterally forming right angle with external intercostal muscle. Innermost intercostal muscle also known as intercostalis intimus are deep layers of the internal intercostal muscles which are separated from them by a neurovascular bundle. The muscle fibers are directed downwards, forwards ...
Extensor pollicis et indicis communis muscle; Extensor carpi radialis tertius muscle - or extensor carpi radialis accessorius; Linburg-Comstock variation - or conjoint flexor pollicis longus and flexor digitorum profundus of the index; Sternalis muscle - or rectus thoracis; Psoas minor muscle; Palmaris profundus muscle; Pterygoideus proprius muscle
The quadratus lumborum muscle originates by aponeurotic fibers into the iliolumbar ligament and the internal lip of the iliac crest for about 5 centimetres (2.0 in). It inserts from the lower border of the last rib for about half its length and by four small tendons from the apices of the transverse processes of the upper four lumbar vertebrae.
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