The intrinsic muscles of the scapula include the rotator cuff muscles, teres major, subscapularis, teres minor, and infraspinatus. The anterior (deep) surface of the scapula forms the broad subscapular fossa. The infraspinatus muscle arises from the whole of the infraspinatus fossa except its lateral 1/4, and from the overlying infraspinatus fascia and the intermuscular septa. The Subscapularis (Fig. It is a ball-and-socket joint, formed between the glenoid fossa of scapula (gleno-) and the head of humerus (-humeral).. Acting in conjunction with the pectoral girdle, the shoulder joint allows for a wide range of motion at the … The supraspinous fossa is located superior to what bony landmark? It also has the glenoid cavity or socket along this border, a shallow fossa which articulates with the head of the humerus, forming the glenohumeral joint. The subscapularis muscle originates from this side. 2 Cut the pectoralis minor’s proximal attachment to the ribs and reflect the muscle superiorly toward its distal attachment to the coracoid process of the scapula. For more information, see “ Neurovasculature of the upper limbs ,” “ Upper arm and elbow, ” and “ Forearm, wrist, and hand .”. Spine on posterior surface with acromion process; also divides posterior surface into supraspinous fossa and infraspinous fossa. Muscle: Origin on scapula : Attachment on humerus: Function: Innervation: subscapularis muscle : subscapular fossa: lesser tuberosity (60%) or humeral neck (40%) internally rotates the humerus: subscapular nerve (C5-6) supraspinatus muscle: supraspinous fossa: inserts on the middle facet of the greater tuberosity: The medial two-thirds of this fossa are marked by several oblique ridges, which run lateralward and upward. … Illustration / Real Bone Infraglenoid tubercle (Tuberculum infra-glenoidale) is a small prominence on the inferior margin of the glenoid fossa.It serves as an attachment point for the long head of the triceps … The acromion also forms the acromioclavicular (AC) joint with the clavicle. Attaching between the scapula and the proximal humerus, it is one of the four muscles of the rotator cuff, along with supraspinatus, infraspinatus and teres minor . The subscapular fossa is a broad concavity on the costal surface of scapula. The medial two-thirds of the fossa are marked by several oblique ridges, which run lateralward and upward. The ridges give attachment to the tendinous insertions, and the surfaces between them to the fleshy fibers, of the Subscapularis. Subscapular. The subscapularis muscle originates from this side. Importantly, this muscle occupies the entire fossa, so it is recognized as the largest muscle attached to the scapula [3]. Dartos muscle is supplied by which nerve? The supraspinatus muscle is located in the suprascapular fossa with insertion of the tendon on the greater tuberosity. ulna & radius within the forearm. The scapula, also known as the shoulder blade, is a flat triangular bone located at the back of the trunk and resides over the posterior surface of ribs two to seven. inferior angle. Action: Internally rotates the shoulder joint, and stabilizes the head of the humerus in the glenoid cavity during movements of the shoulder. Subscapularis can harbor up to three trigger points, with the two most common occurring near the outside edge of the muscle. The subscapularis … The subscapularis originates in the subscapular fossa and inserts into the lesser tubercle of the humerus . Subscapularis is the muscle that occupies the subscapular fossa. This side of the scapula is relatively unremarkable, with a concave depression over most of its surface, called the subscapular fossa. The muscle originates from the medial 2/3rds of the subscapular fossa. is divided into a larger triangular caudal fossa and a smaller cranial fossa which provides an attachment for the subscapularis muscle. The muscular part has origin on the anterior part of the scapula, called the subscapular fossa [ 2 ]. short list of attachment sites for certain muscles. Left scapula. It occupies almost the whole rib surface of the scapula. It is the main supply of blood for the arm. Attachments. Supraspinatus muscle originates from the supraspinous fossa. medial lip of intertubercular groove of humerus. The posterior branch of the suprascapular artery supplies the supraspinatous muscle. Insertion: (distal attachments) Lesser tubercle of humerus. Acromion The trapezius and deltoid have this attachment site in common. 14 The subscapular fossa is located on the anterior surface of the scapula (see Figure 5-5, B). A bursa separates it from the serratus anterior. Specifically, this muscle inserts onto the lesser tubercle of the humerus. The scapula forms the posterior of the shoulder girdle. Med rotation of arm. Front or subscapular fossa. The superior distal fibrous band was always found to be thicker than the others. Muscle attachments to these landmarks are covered in the "Muscles" section. The subscapularis muscle originates at the subscapular fossa and inserts into the lesser tubercle of the humerus. ... important site for muscle attachment smooth flat surface of bone passage for nerves and/or vessels surface used for articulation. The subscapularis is one of the four muscles which compose the rotator cuff apparatus. Subscapularis. Muscle: Origin on scapula : Attachment on humerus: Function: Innervation: subscapularis muscle : subscapular fossa: lesser tuberosity (60%) or humeral neck (40%) internally rotates the humerus: subscapular nerve (C5-6) supraspinatus muscle: supraspinous fossa: inserts on the middle facet of the greater tuberosity: abduction of the arm: Lateral Surface The lateral surface of the scapula meets the humerus. A) External pudendal nerve B) Genitofemoral nerve C) Internal pudendal nerve D) Ilioinguinal nerve. medicina Article Variations in Subscapularis Muscle Innervation—A Report on Case Series Martin Siwetz 1, Niels Hammer 1,2,3,*, Benjamin Ondruschka 4 and David C. Kieser 5 1 Department of Macroscopic and Clinical Anatomy, Medical University of Graz, 8010 Graz, Austria; martin.siwetz@medunigraz.at 2 Fraunhofer IWU, Medical Branch, 01187 Dresden, Germany 3 … Nerve: Subscapular, upper and lower branches. Coracoid process -- muscle attachment site. Shallow ball-and-socket joint. Pectoralis major. Coracoid process -- muscle attachment site. The front of the scapula (also known as the costal or ventral surface) has a broad concavity called the subscapular fossa, to which the subscapularis muscle attaches. Answer: B. Muscle Proximal Attachment Distal Attachment Action Innervation ... • Subscapularis Subscapular fossa Lesser tubercle of the humerus Upper and lower ... muscle (a) Subscapular artery- runs along the anterior surface of the subscapularis, branches into the circumfl ex scapular The distal attachment, which is a … There are also three angles to the scapula. Subscapularis is innervated by the upper and lower subscapular nerves, which involve the nerve roots C5, C6 and C7. The suprascapular artery and nerve are found within the fossa. Anteriorly, on the costal surface, is the shallow subscapular fossa. The ridges give attachment to the tendinous insertions, and the surfaces between them to the fleshy fibers, of the Subscapularis. Supraspinous & infraspinous fossa for muscular attachments. lateral … A fossa is a groove or indentation that typically houses and … It is a triangular, flat bone, which attachment for 17 muscles. Importantly, this muscle occupies the entire fossa, so it is recognized as the largest muscle attached to the scapula [3]. It attaches to the lesser tubercle of the humerus. It is a bulky muscle filling the subscapular fossa. Origin: Subscapular fossa of scapula. sites of muscle attachments. The ventral surface the the scapula abuts the thoracic rib cage and also has a large concavity referred to as the subscapular fossa where the subscapularis attaches. The scapula provides attachment to several groups of muscles. The upper subscapularis nerve The scapula provides attachment to several groups of muscles. The subscapular artery bifurcates into the circumflex scapular, which arcs laterally and posteriorly, and the thoracodorsal artery, which courses inferiorly. Spine – This most prominent feature of the posterior scapula.It goes transversely beyond the scapula, dividing the surface into two-Supraspinous fossa – The area above the spine of the scapula, it is much smaller than the infra spinous fossa and is more convex in shape.The supraspinatus muscle originates from this area.. Infraspinous fossa – The area below the spine … Subscapular Includes most of the area on the anterior fossa surface provides from CLS 224 at King Saud University All of these fossae provide large surface areas for the attachment of muscles that cross the shoulder joint to act on the humerus. initiates & assists deltoid in abduction of arm & acts w/ rotator cuff muscles. The medial two-thirds of the fossa have 3 longitudinal oblique ridges, and another thick ridge adjoins the lateral border; they run outward and upward. The lateral third of the fossa is smooth and covered by the fibers of this muscle. Distally, it gets attached to the lesser tubercle of humerus. subscapular and circumflex scapular aa. is a three-dimensional pyramid-shaped area at the junction of the arm and thorax, inferior to the. carpal bones within the wrist. The superolateral surface of the costal scapula is the coracoid process. Each upper limb = 30 bones. Lesser tubercle of humerus. It is a sturdy, flat, triangular bone. The costal or ventral surface [Fig. The subscapularis is a triangular muscle that fills the subscapular fossa. Action: Medially rotates arm and adducts it; helps to hold humeral head in glenoid cavity of scapula. Insertion: Lesser tuberosity of humerus. The subscapularis muscle is a large and powerful triangle-shaped muscle originating at the subscapular fossa and inserting at the lesser tubercle of the humerus. The superior distal fibrous band was always found to be thicker than the others. The subscapularis muscle is a thick, fan-shaped muscle on the underside of the shoulder blade. Injury to this muscle may occur from trauma or through a degenerative process related to aging. The four Rotator Cuff muscles are: The subscapularis attaches from the subscapular fossa of the scapula to the less er tubercle of the humerus. Between the crests, the muscle bundles were directly attached to the bone. A muscle that assists the agonist in performing itsaction. sub·scap·u·lar fos·sa. the concave ventral aspect of the body of the scapula giving origin to the subscapularis muscle. subscapular fossa. A broad, flat concavity on the costal surface of the scapula, which provides the origin for the subscapular muscle. Front or subscapular fossa. Infraspinous fossa: Shallow depression inferior to the spine on the posterior surface of the scapula; site of muscle attachment. shoulder joint. The subscapular muscle (m. Subscapularis) is broad, thick, triangular in shape. Laterally is the glenoid fossa, anteriorly is the coracoid process, and superiorly is the acromion that is continuous with the scapular spine and arcs anteriorly over the humeral head. subscapular fossa: [TA] the concave ventral aspect of the body of the scapula giving origin to the subscapularis muscle. Teres Minor. Between the crests, the muscle bundles were directly attached to the bone. At the upper part of the fossa is a transverse depression, where the bone appears to be bent on itself along a line at right angles to and passing through the center of the glenoid cavity , forming a considerable angle, called the subscapular angle . The costal or ventral surface of the scapula presents a broad concavity, the subscapular fossa. 15 muscles attach to the scapula. Where does the humerus articulate on the pectoral girdle? The acromion of the scapula is a large bony projection on the superior end of the scapula. Academia.edu is a platform for academics to share research papers. Attachment site for the coracobrachilalis, short head of biceps brachii, and pectoralis minor muscle; attachment for the coracoclavicular and coracoacromial ligaments. What is the ligament attachment site on the clavicle called? 3 ridges in ~ this fossa enable for tendinous attachment. Upper Arm: Brachial Artery. Glenoid cavity for head of humerus. The scapula, along with the clavicle and the manubrium of the sternum, make up the pectoral (shoulder) girdle which connects the upper limb of the appendicular skeleton to the axial skeleton. 3 borders: 1.superior. Subscapular fossa Fossa on the anterior scapula that holds the subscapularis muscle ... Medial epicondyle Attachment site for muscles of the anterior forearm (flexors and pronator teres) Lateral epicondyle Attachment site for muscles of the posterior forearm (extensors and supinator) Strong fibrous attachments of the subscapularis muscle were found along the lateral border of the scapula as well as along the medial third of the bony crests in the subscapular fossa.

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