11: Upper Limb: Shoulder and Arm Muscles (IC)

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11: Upper Limb: Shoulder and Arm Muscles (IC) por Mind Map: 11: Upper Limb: Shoulder and Arm Muscles (IC)

1. Axilla

2. Arm muscles

2.1. Anterior compartment (flexors)

2.1.1. Biceps brachii

2.1.2. Brachialis

2.1.3. Chorachobrachialis

2.2. Posterior compartment (extensors)

2.2.1. Triceps brachii

2.2.2. Anconeus

3. Scapulohumeral muscles

3.1. Deltoid

3.1.1. Origine Anterior Fibers : Lateral Third of the Anterior Border of the Clavicle Middle Fibers: Lateral Border of the Acromion Posterior Fibers: Lower Border of the Spine of the Scapula

3.1.2. Insertion Deltoid Tuberosity of Humerus

3.1.3. Nerve supply Axillary Nerve

3.1.4. Action Anterior Fibers – Flexion & Medial Rotation of Arm Middle Fibres: Abduction of Arm up to 90° Posterior Fibres – Assist in Extension & Act in Lateral Rotation of Arm

3.1.5. Intramuscular injections

3.2. Teres major

3.2.1. Origine Posterior Surface of Inferior Angle of Scapula

3.2.2. Insertion Medial Lip on Intertubercular Groove of Humerus

3.2.3. Nerve supply Lower Subscapular Nerve

3.2.4. Action Adducts Medially Rotates Help in Extending Flexed Arm

3.3. Coracobrachialis

3.3.1. Origine Coracoid process of scapula

3.3.2. Insertion middle of medial surface of shaft of the humerus

3.3.3. Nerve supply Musculocutaneous nerve

3.3.4. action flexion adduction

3.4. Rotator cuff muscles

3.4.1. Subscapularis Origine Subscapular Fossa Insertion Lesser Tubercle of Humerus Nerve supply Upper & Lower Subscapular Nerves action Medial rotation adduction Helps to Hold Humeral Head in Glenoid Cavity

3.4.2. Supraspinatus Origine Supraspinous Fossa of Scapula Insertion Superior Facet on Greater Tubercle of Humerus Nerve supply Suprascapular Nerve Action Initiates (15°) & Assists Deltoid in Abduction of Arm Stabilize the Shoulder by Maintaining Head in Cavity

3.4.3. Infraspinatus Origine Infraspinous Fossa of Scapula Insertion Middle Facet on Greater Tubercle of Humerus Nerve supply Suprascapular Nerve Action Laterally Rotates the Arm Help to Hold Humeral Head in Glenoid Cavity of Scapula

3.4.4. Teres minor Origine Lateral Border of Scapula Insertion Inferior Facet on Greater Tubercle of Humerus Nerve supply Axillary Nerve Action Laterally Rotates the Arm Adducts the Arm (weak) Help to Hold Humeral Head in Glenoid Cavity of Scapula

4. Posterior axioappendicular muscles

4.1. Deep

4.1.1. Levator scapulae

4.1.2. Rhomboids Major (wider) Minor (thicker)

4.2. Superficial

4.2.1. Trapezius Origins Occipital bone Ligamentum nuchae C7 to T12 Insertion Superior fibres (occipital and upper cervical) Middle fibres (lower cervical and upper thorcaic) Inferior fibres Nerve supply Motor Sensory Action all fibers superor fibers middle fibers inferior fibers

4.2.2. Latissimus dorsi Origins Insertion

5. Anterior axioappendicular muscles

5.1. Pectoralis major

5.1.1. Location Anterior wall of the axilla Forms the anterior axillary fold Covered by tough fascia

5.1.2. 2 origins sternocostal head Sternum Upper 6 costal cartilages aponeurosis of the external oblique muscle of the abdomen Clavicular head Medial Half of the Clavicle

5.1.3. Insertion Lateral lip of the biciptal groove (intertubercular sulcus) of the humerus

5.1.4. Action as a whole Medial rotation Adduction Accessory inspiratory muscle clavicular head assist in flexion sternocostal head extends the flexed arm to the side of the trunk

5.1.5. Innervation medial and lateral pectoral nerves Clavicular head (C5,6) Sternocostal (C6,7,8,and T1)

5.2. Pectoralis minor

5.2.1. location anterior wall of the axilla

5.2.2. Origins 3rd-5th ribs

5.2.3. Insertion Carocoid process of scapula

5.2.4. Nerve supply Medial and lateral pectoral nerves

5.2.5. Action Protraction (assist serratus anterior) Accessory inspiratory muscle (assists in forced inhalation) Important landmark to axillary artery and brachial plexus cords Connected to clavicle by clavipectoral fascia Stabilises the scapula Depresses the Point of Shoulder to Rest Position after full abduction

5.3. Subclavius

5.3.1. Origine First Costal Cartilage and Adjacent Bone

5.3.2. Insertion Inferior surface of clavicle (subclavicle groove)

5.3.3. Nerve supply Nerve to subclavius

5.3.4. Action stabilising the clavicle depresses the clavicle prevents damage to subclavian vain when the clavicle is fractured stabilising the clavicle

5.4. Serratus anterior

5.4.1. Medial wall of the axilla

5.4.2. Origin Outer Lateral Surfaces of the Upper Eight Ribs

5.4.3. Insertion Medial margin of the costal surface of Scapula

5.4.4. Nerve supply Long Thoracic Nerve of Bell

5.4.5. Action Protracts Scapula (draws it internally and forward) Rotates the scapula lowers the arm from a raised position Holds vertebral border of scapula Against Thoracic Wall in all positions Accessory forced inspiratory muscle

6. u need to know

6.1. Location and orientation of muscle fibers

6.2. Muscle goups

6.3. Origin

6.4. Insertion

6.5. Action

6.6. Innervation

6.7. Relations

7. Axial muscles that move the humerus