| Subscapularis muscle | |
|---|---|
 |
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| Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Subscapularis visible near center top. ) | |
| Latin | musculus subscapularis |
| Gray's | subject #123 440 |
| Origin | subscapular fossa |
| Insertion | lesser tubercle of humerus |
| Artery: | transverse cervical artery, [1] subscapular artery |
| Nerve: | upper subscapular nerve, lower subscapular nerve (C5, C6) |
| Action: | rotates medially humerus; stabilizes shoulder |
| Dorlands /Elsevier |
m_22/12551017 |
The Subscapularis is a large triangular muscle which fills the subscapular fossa. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. A typical Adult Human skeleton commonly consists of 206 208 or more bones depending on the method used in counting The costal or ventral surface of the Scapula presents a broad concavity the subscapular fossa. A typical Adult Human skeleton commonly consists of 206 208 or more bones depending on the method used in counting The lesser tubercle of the Humerus, although smaller is more prominent than the Greater tubercle: it is situated in front and is directed medialward and forward The humerus is a Long bone in the Arm or Forelimb that runs from the Shoulder to the Elbow. Arteries are Blood vessels that carry blood away from the Heart. The transverse cervical artery ( transverse artery of neck, transversalis colli artery) is a branch of the Thyrocervical trunk, running at a higher level The subscapular artery, the largest branch of the Axillary artery, arises at the lower border of the Subscapularis, which it follows to the inferior angle of the Accessory nerve Accessory obturator nerve Alderman's nerve Anococcygeal nerve Ansa The upper subscapular ( short subscapular, superior subscapular) enters the upper part of the Subscapularis, and is frequently represented by two branches The lower subscapular ( inferior subscapular) is a nerve which supplies the lower part of the Subscapularis, and ends in the Teres major; the latter muscle Kinesiology, also known as Human Kinetics, is the science of human movement In Anatomy, internal rotation (also known as medial rotation) is rotation towards the center of the body The humerus is a Long bone in the Arm or Forelimb that runs from the Shoulder to the Elbow. In Human anatomy, the shoulder joint comprises the part of the body where the Humerus attaches to the Scapula. Elsevier, the world's largest Publisher of Medical and Scientific literature, forms part of the Reed Elsevier group The costal or ventral surface of the Scapula presents a broad concavity the subscapular fossa.
Contents |
Origin and insertion
It arises from its medial two-thirds and from the lower two-thirds of the groove on the axillary border(subscapular fossa) of the scapula. }The lateral border (or axillary border, or margin) is the thickest of the three borders of the Scapula. In Anatomy, the scapula, omo, or shoulder blade, is the Bone that connects the Humerus (arm bone with the Clavicle (collar
Some fibers arise from tendinous laminæ which intersect the muscle and are attached to ridges on the bone; others from an aponeurosis, which separates the muscle from the Teres major and the long head of the Triceps brachii. Teres major is a muscle of the Upper limb and one of six scapulohumeral muscles The triceps brachii ( Latin for "three-headed" of the arm is the large muscle on the back of the human Upper limb.
The fibers pass lateralward, and, gradually converging, end in a tendon which is inserted into the lesser tubercle of the humerus and the front of the capsule of the shoulder-joint. The lesser tubercle of the Humerus, although smaller is more prominent than the Greater tubercle: it is situated in front and is directed medialward and forward The humerus is a Long bone in the Arm or Forelimb that runs from the Shoulder to the Elbow. In Human anatomy, the shoulder joint comprises the part of the body where the Humerus attaches to the Scapula.
Relations
The tendon of the muscle is separated from the neck of the scapula by a large bursa, which communicates with the cavity of the shoulder-joint through an aperture in the capsule. A bursa (plural bursae or bursas; Latin: Bursa synovialis) is a small fluid-filled sac made of white fibrous tissue and lined with Synovial
Innervation
Innervation to subscapularis is supplied by the upper and lower subscapular nerves, branches of the posterior cord of the brachial plexus. The upper subscapular ( short subscapular, superior subscapular) enters the upper part of the Subscapularis, and is frequently represented by two branches The lower subscapular ( inferior subscapular) is a nerve which supplies the lower part of the Subscapularis, and ends in the Teres major; the latter muscle The brachial Plexus is an arrangement of nerve fibers running from the spine formed by the Ventral rami of the lower cervical and upper thoracic nerve roots specifically
Actions
The Subscapularis rotates the head of the humerus medially (internal rotation); when the arm is raised, it draws the humerus forward and downward. The humerus is a Long bone in the Arm or Forelimb that runs from the Shoulder to the Elbow. It is a powerful defense to the front of the shoulder-joint, preventing displacement of the head of the humerus. In Human anatomy, the shoulder joint comprises the part of the body where the Humerus attaches to the Scapula.
Additional images
 Diagram of the human shoulder joint |
 Left scapula. Costal surface. |
 Left humerus. Anterior view. |
 The axillary artery and its branches. |
References
External links
- LUC subs
- Subscapularis+muscle at eMedicine Dictionary
This article was originally based on an entry from a public domain edition of Gray's Anatomy. Loyola University Chicago is a private co-educational Jesuit university established in Chicago in 1870 as Saint Ignatius College eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely two medical doctors The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened is an English-language Human anatomy Textbook As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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