1 Bones (Clavicle, Scapula & Humerus)

Question 1

Practice an oral presentation of the clavicle.

Answer 1

Location: spans the anterior superior chest wall between the sternum and the lateral scapula. forms part of the pectoral girdle

Structure: flat bone

Function:
anchors and depresses clavicle

Surfaces:
superior (smooth)
inferior (rough)

Shape: medial two thirds convex anteriorly, and lateral third concave anteriorly

Articulates with the sternum and the first rib at the medial end, forming the sternoclavicular joint (sternal facet)

Articulates with the acromion process of the scapula at the lateral end, forming the acromioclavicular joint (acromial facet)

4 Attachments (from medial to lateral):

impression for costoclavicular ligament on the inferior surface near the sternal end

subclavian groove on the inferior surface (middle) for the insertion of the subclavius muscle

conoid tubercle on the inferior surface for the insertion of the conoid ligament (coracoclavicular ligament)

trapezoid line on inferior surface for the insertion of the trapezoid ligament (coracoclavicular ligament)

Question 2

Practice an oral presentation of the scapula

Answer 2

Location: forms part of the shoulder girdle, located on the posterior and lateral surface of the body

Structure: flat bone ( & describe whether sample is a left or right scapula)

Function:
articulates with the humerus to form the glenohumeral joint. contributes to the stability of the glenohumeral joint, and contributes to the biomechanics of the glenohumeral joint.

articulates with the clavicle to form the acromioclavicular joint

position of the anterior scapular surface against the thoracic ribcage forms an informal ‘scapulothoracic joint’ (not a true joint as the bones are not connected)

3 borders:
Superior
Medial
Lateral

3 angles:
Superior
Inferior
Lateral

2 surfaces:
Anterior
Posterior

Bony landmarks:
Spine of the scapula
Scapular notch
Head of the scapula
Neck of the scapula
Acromion Process
Coracoid process
Glenoid fossa (glenoid labrum)
Supraglenoid tubercle
Infraglenoid tubercle

Attachments:
supraspinous fossa for the insertion of the supraspinatus muscle

infraspinous fossa for the insertion of the infraspinatus muscle

subscapular fossa for the insertion of the subscapularis muscle

Question 3

Practice an oral presentation of the humerus

Answer 3

Location: the only bone in the brachium

Structure: long bone, identify diaphysis, metaphysis, and epiphysis (& identify whether sample is left or right)

Articulates with scapula to form the glenohumeral joint

Articulates distally with radius to form the humeroradial joint, and the ulna to form the humeroulnar joint

Surfaces:
posterior
anterolateral

Proximal features:
Head of the humerus
Surgical neck of the humerus
Anatomical neck of the humerus
Greater tubercle
Lesser tubercle
Bicipital groove
Deltoid tuberosity
Radial groove

Distal features:
Lateral supracondylar ridge
Lateral epicondyle
Radial fossa
Capitulum
Olecranon fossa

Medial supracondylar ridge
Medial epicondyle
Coronoid fossa
Trochlea