W7 - Shoulder Girdle: Bones, Ligaments & Muscles Flashcards
What bones make up the shoulder girdle
Clavicle
Scapula
Sternum
What is the shoulder joint called
Gleno-humeral joint
What joint joins the sternum and the clavicle
Sternoclavicular joint
What is the function of the shoulder girdle
Increases ROM in the upper limb by changing the position of the glenoid fossa
Clavicle absorbs tension & compresses stress allowing forces to be transmitted from upper limb to the trunk
What shape is the clavicle
“S” shape
Describe the medial end of the clavicle
Convex anteriorly
Rounded triangular shape
Joins with the sternum = sternoclavicular joint
Describe the lateral end of the clavicle
Concave anteriorly
Broad and flatter
Articulates with the acromion process of scapula = acromioclavicular joint
What attaches to the deltoid tubercle of the clavicle
Anterior fibres of deltoid
What attaches to the trapezoid line and conoid tubercle of the clavicle
Coro clavicular ligament
What attaches in the subclavian groove of the clavicle
Subclavian vessels
What attaches to the costal tuberosity of the clavicle
Costoclavicular ligament joints
What 5 muscles attach to the clavicle
Sternocleidomastoid
Pectoralis Major
Trapezius
Deltoid
Subclavius
Describe the location and shape of the scapular
Sits posteriorly
Flat bone
Forms glenohumeral joint & acromiclavicular joint
Name the 3 borders of the scapular
Medial, lateral and superior
Name the 2 angles of the scapula
Superior and inferior
What does the spine of the scapula divide it into
Supraspinous Fossa
Infraspinous fossa
What are the 3 divisions of the sternum
Manubrium
Sternum
Xiphoid process
Name 3 other Boney landmarks on the sternum
Sternal notch
Clavicular notch
Sternal angle
Classify the acromioclavicular joint
Synovial plane joint (ONLY GLIDING MOVEMENTS)
Covered in fibrocartilage
Classify the sternoclavicular joint
Synovial saddle joint
Convex clavicle covered in fibrocartilage, manubrium concave covered in hyaline cartilage & costal cartilage of first rib
What does the scapulothoracic junction do
Joins scapular to the thorax
Describe the subclavius muscle
Inferior to clavicle
From: costochondral junction of 1st rib To: inferior surface of middle 1/3 clavicle
Nerve supply: subclavian nerve C5,6
Stabilises SCJ & depresses lateral end of clavicle
Describe pectoralis minor
Anterior chest wall
From: anterior & superior surface of ribs 3,4,5 To: coracoid processes of the scapula
Nerve supply: medial & lateral pectoral nerve C5-8, T1
Shoulder girdle depression, protraction and accessory muscle respiration
Describe serratus anterior muscle
From: anterior surface of medial border of scapula To: lateral surface of upper 8-9 ribs
Nerve supply: long thoracic nerve C5-7
Shoulder girdle protraction and lateral rotation of scapula
Describe trapezius muscle
From: superior nuchal line & external occipital protuberance, ligamentum nuchae, spinous processes C7-T12, supraspinous ligament To: lateral 1/3 clavicle, acromion and spine of scapula, medial end of scapula line
Nerve supply: accessory nerve C3-4
Describe levator scapulae muscle
From: superior portion of medial border of scapula To: transverse processes C1-4
Nerve supply: dorsal scapular nerve C4-5
Actions: elevation, medial rotation, cervical extension, cervical side flextion
Describe Rhomboid minor muscle
From: spinous processes c7-T1 To: medial border of scapula at root of spine
Nerve supply: dorsal scapular nerve C4-5
Actions: elevation and retraction
Describe rhomboid major muscle
From: spinous processes T2-5 To: medial border of scapula from root of spine to inferior angle
Nerve supply : dorsal scapular nerve C4-5
Actions: elevation and retraction
