Search Results
Showing results 1 - 8 of 42
The Intrinsic Muscles of the Shoulder
The muscles of the shoulder are associated with movements of the upper limb. They produce the characteristic shape of the shoulder, and can be divided into two groups: Extrinsic – originate from the torso, and attach to the bones of the shoulder (clavicle, scapula or humerus). Intrinsic – originate from the scapula and/or clavicle, and attach […]
The Extrinsic Muscles of the Shoulder
The muscles of the shoulder are associated with movements of the upper limb. They produce the characteristic shape of the shoulder, and can be divided into two groups: Extrinsic – originate from the torso, and attach to the bones of the shoulder (clavicle, scapula or humerus). Intrinsic – originate from the scapula and/or clavicle, and attach […]
The Shoulder Joint
The shoulder joint (glenohumeral joint) is a ball and socket joint between the scapula and the humerus. It is the major structure connecting the upper limb to the trunk and is one of the most mobile joints in the human body. In this article, we shall look at the anatomy of the shoulder joint – […]
Muscles of the Shoulder Region
[child-pages depth=”1″]
Rhomboid Minor
The rhomboid minor is an extrinsic muscle of the shoulder. It is located deep to the trapezius, and superior to the rhomboid major. Attachments: Originates from the spinous processes of C7-T1 vertebrae. Attaches to the medial border of the scapula, at the level of the spine of scapula. Actions: Retraction and rotation of the scapula. […]
Rhomboid Major
The rhomboid major is an extrinsic muscle of the shoulder. It is located deep to the trapezius, and inferior to the rhomboid minor. Attachments: Originates from the spinous processes of T2-T5 vertebrae. Attaches to the medial border of the scapula, between the scapula spine and inferior angle. Actions: Retracts and rotates the scapula. Innervation: Dorsal scapular […]
Latissimus Dorsi
The latissiumus dorsi is an extrinsic muscle of the shoulder. Attachments: Originates from the spinous processes of T7-T12, iliac crest, thoracolumbar fascia and the inferior three ribs. The fibres converge into a tendon that attaches to the intertubercular sulcus of the humerus. Actions: Extension, adduction and medial rotation of the upper limb at the shoulder. Innervation: […]
Trapezius
The trapezius is an extrinsic muscle of the shoulder. It is a broad, flat and triangular shape – forming a trapezoid shape in combination with the contralateral side. Attachments: Originates from the skull, nuchal ligament and the spinous processes of C7-T12. The fibres attach to the clavicle, acromion, and the scapula spine. Actions: Abduction of […]
Teres Minor
The teres minor is an intrinsic muscle of the shoulder region. It is part of the rotator cuff muscle group. Attachments: Originates from the posterior surface of the scapula, adjacent to its lateral border. It attaches to the greater tubercle of the humerus. Actions: Lateral rotation of the arm. Innervation: Axillary nerve. Blood supply: Circumflex […]
Subscapularis
The subscapularis is an intrinsic muscle of the shoulder region. It is part of the rotator cuff muscle group. Attachments: Originates from the subscapular fossa (anterior surface of the scapula). It attaches to the lesser tubercle of the humerus. Actions: Medial rotation of the arm Innervation: Upper and lower subscapular nerves. Blood supply: Subscapular artery.