MindMap Gallery Upper Limb - Shoulder and Arm Muscles (IC)

Upper Limb - Shoulder and Arm Muscles (IC)

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Edited at 2020-09-28 14:01:48

Lisa Anderson

Upper Limb - Shoulder and Arm Muscles (IC)

Lisa Anderson

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Upper Limb: Shoulder and Arm Muscles (IC)

Axial muscles that move the humerus

u need to know

Location and orientation of muscle fibers

Muscle goups

Origin

Insertion

Action

Innervation

Relations

Anterior axioappendicular muscles

Pectoralis major

Location

Anterior wall of the axilla

Forms the anterior axillary fold

Covered by tough fascia

2 origins

sternocostal head

Sternum

Upper 6 costal cartilages

aponeurosis of the external oblique muscle ofthe abdomen

Clavicular head

Medial Half of the Clavicle

Insertion

Lateral lip of the biciptal groove (intertubercularsulcus) of the humerus

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

Innervation

medial and lateral pectoral nerves

Clavicular head (C5,6)

Sternocostal (C6,7,8,and T1)

Pectoralis minor

location

anterior wall of the axilla

Origins

3rd5th ribs

Insertion

Carocoid process of scapula

Nerve supply

Medial and lateral pectoral nerves

Action

Protraction (assist serratus anterior)

Accessory inspiratory muscle (assists inforced inhalation)

Important landmark to axillary artery andbrachial plexus cords

Connected to clavicle by clavipectoral fascia

Stabilises the scapula

Depresses the Point of Shoulder to RestPosition after full abduction

Subclavius

Origine

First Costal Cartilage and Adjacent Bone

Insertion

Inferior surface of clavicle (subclavicle groove)

Nerve supply

Nerve to subclavius

Action

stabilising the clavicle

depresses the clavicle

prevents damage to subclavian vain when theclavicle is fractured

stabilising theclavicle

Serratus anterior

Medial wall of the axilla

Origin

Outer Lateral Surfaces of the Upper Eight Ribs

Insertion

Medial margin of the costal surface of Scapula

Nerve supply

Long Thoracic Nerve of Bell

Action

Protracts Scapula (draws it internally andforward)

Rotates the scapula

lowers the arm from a raised position

Holds vertebral border of scapula AgainstThoracic Wall in all positions

Accessory forced inspiratory muscle

Posterior axioappendicular muscles

Deep

Levator scapulae

Rhomboids

Major (wider)

Minor (thicker)

Superficial

Trapezius

Origins

Occipital bone

Ligamentum nuchae

C7 to T12

Insertion

Superior fibres (occipital and upper cervical)

posterior border of the Lateral Third ofClavicle

Middle fibres (lower cervical and upperthorcaic)

Acromion &amp; Spine of the Scapula

Inferior fibres

Spine of the Scapula

Nerve supply

Motor

Spinal part of the Accessory Nerve

Sensory

C3,4

Action

all fibers

retraction of scapula

superor fibers

lateral flexion &amp;extension of the neck

elevation of scapula

middle fibers

pull the scapula medially

inferior fibers

Pull the Medial Border of the ScapulaDownward so that the Glenoid Cavity FacesUpward &amp; Forward

Latissimus dorsi

Origins

Insertion

Scapulohumeral muscles

Deltoid

Origine

Anterior Fibers : Lateral Third of the AnteriorBorder of the Clavicle

Middle Fibers: Lateral Border of the Acromion

Posterior Fibers: Lower Border of the Spine ofthe Scapula

Insertion

Deltoid Tuberosity of Humerus

Nerve supply

Axillary Nerve

Action

Anterior Fibers – Flexion &amp; Medial Rotation ofArm

Middle Fibres: Abduction of Arm up to 90°

Posterior Fibres – Assist in Extension &amp; Act inLateral Rotation of Arm

Intramuscular injections

Teres major

Origine

Posterior Surface of Inferior Angle of Scapula

Insertion

Medial Lip on Intertubercular Groove ofHumerus

Nerve supply

Lower Subscapular Nerve

Action

Adducts

Medially Rotates

Help in Extending Flexed Arm

Coracobrachialis

Origine

Coracoid process of scapula

Insertion

middle of medial surface of shaft of thehumerus

Nerve supply

Musculocutaneous nerve

action

flexion

adduction

Rotator cuff muscles

Subscapularis

Origine

Subscapular Fossa

Insertion

Lesser Tubercle of Humerus

Nerve supply

Upper &amp; Lower Subscapular Nerves

action

Medial rotation

adduction

Helps to Hold Humeral Head in Glenoid Cavity

Supraspinatus

Origine

Supraspinous Fossa of Scapula

Insertion

Superior Facet on Greater Tubercle ofHumerus

Nerve supply

Suprascapular Nerve

Action

Initiates (15°) &amp; Assists Deltoid in Abduction ofArm

Stabilize the Shoulder by Maintaining Head inCavity

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 Cavityof Scapula

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 Cavityof Scapula

Arm muscles

Anterior compartment (flexors)

Biceps brachii

Brachialis

Chorachobrachialis

Posterior compartment (extensors)

Triceps brachii

Anconeus

Axilla