- make a selection - supraspinatus trapezius triceps brachii infraspinatus deltoid pectoralis major subscapularis biceps brachii teres minor latissimus dorsi. The most notable and clinically important are the rotator cuff muscles. Insertion: Greater tubercle of the humerus (proximal half of humerus) Action: Flexes, adducts, and medially rotates the arm. When this muscle contracts, normally the arm moves due to having less mass than the torso. Origin: Area between the ASIS (Anterior Superior Iliac Spine) and AIIS (Anterior Inferior Iliac Spine). The Spinalis Cervicis origin points are from the lower ligamentum nuchae: spinous processes of C6 or C7 and the insertion point of attachment is the spinous process of the axis. Muscle Name. Adduction 5. Innervation:Suprascapular n. of the brachial plexus Origin: Supraspinous fossa of the scapula Insertion: Lesser and greater tubercles of the humerus Action: Extends and braces the shoulder. Chronically tight hamstrings are often a contributory factor to lower back pain and knee pain. There are several different types of movements, including flexion, extension, hyperextension, abduction, adduction, and circumduction to name a few. There is an anatomical connection between pectoral girdle and the axial skeleton; that is, the sternoclavicular joints, that lies anteriorly. Arterial (Blood) Supply of Rotatores Muscular branches of the aorta. • Action – scapular elevation 20 21. ** muscle crosses 2 joint, has action at 2 joints Anterior Muscle Group Muscle Origin Insertion Actions **Biceps brachii long head above glenoid fossa; short head at coracoid process of scapula Radial tuberosity * shoulder jt = flexion of arm *elbow jt = flexion of forearm. The scapula or shoulder blade is the bone that connects the clavicle to the humerus. The horizontal shoulder adduction muscles mnemonic is PABC as well, just like shoulder flexion. Selecting this icon allows you to read the muscle’s definition. THE SPINALIS MUSCLES. rotates (in. Insertion: Anterior part of the medial condyle of the tibia. Rotation The basic action of any muscle is contraction. For example, when you think about moving your arm using your biceps muscle, your brain sends a signal down a nerve cell telling your biceps muscle to contract. The amount of force that the muscle creates varies -- the muscle can contract a little or a lot depending on the signal that the nerve sends. Muscles That Position the Pectoral Girdle. Internal rotation of the hip when the knee is flexed. Origin: Clavicular head - medial half of clavicle, sternal head - sternum, cartilages of upper 6 ribs. Muscles That Move the Forearm and Wrist. Actions: Internal rotation, Adduction, Extension and stabilization of the glenohumeral joint. It derives its name from the fact that it consists of two parts (heads), both innervated by the musculocutaneous nerve. Action: Adduction, horizontal adduction, medial/internal rotation of humerus, flexion, and extension of humerus from a flexed position the nerve runs between these muscles. The long head of the biceps muscle assists other muscles with shoulder flexion. Pectoralis major 2. • Insertion – posterior border of the lateral one third of the clavicle. The muscles of the shoulder are associated with movements of the upper limb. SHOULDER FLEXION 0 to 180* MUSCLES ORIGIN INSERTION Deltoid Axillary nerve Clavicle (ant. The posterior thoracic muscles are the trapezius, levator scapulae, rhomboid major, and rhomboid minor. • Origin: head and upper 2/3 of the outer surface of the fibula • Insertion: undersurfaces of the 1st cuneiform and first metatarsal bones • Note: passes posterior to lateral malleolus. Brachialis is the last of the three muscles forming the anterior compartment of the arm. For example, with the latissimus dorsi muscle, the origin site is the torso, and the insertion is the arm. Start studying Shoulder Joint - Origin, Insertion, Action, Innervation. Action: Extension at elbow, plus extension and adduction at the shoulder. adduction. The muscles that position and stabilize the pectoral girdle are located on the thorax. abducts) the shoulders - Stabilises scapula by drawing it inferiorly and anteriorly It is located in the front of the upper arm and attaches to the glenoid fossa, or "socket" part of the shoulder joint. The pectoral girdle connects the upper limb to the axial skeleton on the right and side left of the body. • Actions: – Eversion – Plantar flexion • The tendon goes under the foot from the lateral to the medial surface, thus aiding in -Insertion: posterior border of the lateral 1/3 of the clavicle. 2. They insert onto the anteromedial surface of the humeral shaft, between the brachialis muscle and the medial head of triceps. Scapulothoracic Muscles Those muscles that affect the movement of scapula and clavicle on the thorax. Shoulder and Arm Anatomy. Origin: Ischial tuberosity. Origin: anchors on the anterior lateral 3rd of the clavicle. Above spine of scapula (supraspinous fossa): Supraspinatus (Suprascapular nerve) Middle phalanges of digits 2-5. Insertion: Posterior part of the medial condyle of the tibia. Sternocostal fibres to posterior lamina with highest fibres into capsule Of shoulder Flexion. Tensor fascia antebrachii The origin and insertion refer to the anatomic locations of where a muscle attaches (usually a bone). Origin: the supraspinous fossa. Innervation: Upper and lower subscapular nerve. Abduction 4. Origin: short head - corocoid process of scapula, long head - supraglenoid tubercle of scapula; Insertion: radius; Action: supination of lower arm, flexion of shoulder and elbow Flexor Carpi Ulnaris Origin: medial epicondyle of humerus; Insertion: 5th metacrapal; Action: wrist flexion and adduction The intrinsic muscles of the shoulder form the scapulohumeral group – main Adductor pollicis muscle (Musculus adductor pollicis) Adductor pollicis is a triangular intrinsic muscle of the hand.It belongs to a group called thenar muscles, along with abductor pollicis, flexor pollicis brevis, and opponens pollicis.Thenar muscles are located on the radial (lateral) aspect of the hand where they form an elevation named the thenar eminence. Synergists: a muscle or a group of muscles that contract to help in making the movement more precise (eg. The origin of a muscle is the bone, typically proximal, which has greater mass and is more stable during a contraction than a muscle's insertion. Supraspinatus. Action: - flexion (STRONGEST MOVER), internal (medial rotation) (SECONDARY MOVER), horizontal adduction of the humerus, and abduction of the humerus (a few fibers). The PABC of horizontal shoulder adduction stands for: pec major, anterior deltoid, biceps brachii short head, coracobrachialis. posterior cord of the brachial plexus. Origin: - Spinous processes of T2-T5 Insertion: - Medial border of scapula between root of spine and inferior angle What are the main functions and actions of the pectoralis minor? Biology. The origin, insertion, and action of individual groups of spinal muscles are listed in Table 4.5. The muscles of the shoulder are grouped: Lateral.
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