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30 Οκτ 2023 · The humerus is the longest and largest bone of the upper limb. It consists of a proximal end, a shaft and a distal end, all which contain important anatomical landmarks. The humerus articulates with the scapula proximally at the glenohumeral joint so it participates in the movements of the shoulder.
30 Οκτ 2023 · The function of this entire muscular apparatus is to produce movement at the shoulder joint while keeping the head of humerus stable and centralized within the glenoid cavity. Memorize the rotator cuff muscles using the mnemonic given below!
8 Οκτ 2024 · It deepens the cavity and creates a seal with the head of humerus, reducing the risk of dislocation. Ligaments – act to reinforce the joint capsule and form the coracoacromial arch. Biceps tendon – it acts as a minor humeral head depressor, thereby contributing to stability.
3 Νοε 2023 · All parts converge and insert together to the intertubercular sulcus of humerus. The muscle is innervated by the thoracodorsal nerve. Its functions are the adduction, internal rotation and extension of the arm, while it also assists in the respiration.
The following tables include muscles that act on the scapula and the humerus. Other functions of these muscles not related to the scapula and shoulder motion are not included in these tables (e.g. when the scapula is fixed, levator scapulae assists with the lateral flexion of the cervical spine).
28 Σεπ 2024 · The intrinsic muscles (also known as the scapulohumeral group) originate from the scapula and/or clavicle, and attach to the humerus. There are six muscles in this group – the deltoid, teres major, and the four rotator cuff muscles (supraspinatus, infraspinatus, subscapularis and teres minor).
25 Οκτ 2024 · The tendons of these muscles surround and support the humerus while the contraction of the muscles rotates, adducts, or abducts the humerus. Surrounding the rotator cuff muscles are many groups of muscles that work together to produce the various movements of the shoulder.
