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The scalene muscles are a group of three muscles on each side of the neck, identified as the anterior, the middle, and the posterior. They are innervated by the third to the eighth cervical spinal nerves (C3-C8). The anterior and middle scalene muscles lift the first rib and bend the neck to the side they are on. The posterior scalene lifts the ...
The erector spinae (/ ɪ ˈ r ɛ k t ər ˈ s p aɪ n i / irr-EK-tər SPY-nee) [1] or spinal erectors is a set of muscles that straighten and rotate the back.The spinal erectors work together with the glutes (gluteus maximus, gluteus medius and gluteus minimus) to maintain stable posture standing or sitting.
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Muscle [3] Visual reference Method of activation 1: Anterior and middle scalenes: Look straight ahead and lift head anterior 2: Posterior scalenes: Turn head 30 degrees away and lift anterior 3-5: Pectoralis minor: Push ipsilateral elbow towards opposite ASIS. 6-8: Serratus Anterior: Push arm anteriorly 9-11: Latissimus dorsi
The infrahyoid muscles, or strap muscles, are a group of four pairs of muscles in the anterior (frontal) part of the neck. [1] The four infrahyoid muscles are the sternohyoid, sternothyroid, thyrohyoid and omohyoid muscles. [1] Excluding the sternothyroid, the infrahyoid muscles either originate from or insert on to the hyoid bone. [2]
The accessory nerve is tested by evaluating the function of the trapezius and sternocleidomastoid muscles. [8] The trapezius muscle is tested by asking the patient to shrug their shoulders with and without resistance. The sternocleidomastoid muscle is tested by asking the patient to turn their head to the left or right against resistance. [8]
Klumpke's paralysis is a variety of partial palsy of the lower roots of the brachial plexus. [1] [2] The brachial plexus is a network of spinal nerves that originates in the back of the neck, extends through the axilla (armpit), and gives rise to nerves to the upper limb.
Cadaveric studies showed that the sternalis muscle has a mean prevalence of around 7.8% in the population, [7] with a slightly higher incidence in females. [1] The prevalence ranges from 0.5% to 23.5%, depending on the subpopulation [8] — it has been proposed that the possible reason for the sizable range could be the fact of the existence of small, ill-defined, or tendinous fibres which ...