Pectoral Girdle Flashcards
Which two bones compromise the pectoral girdle?
The scapula and the clavicle
Where does the clavicle articulate medically?
Manubrium of the sternum (sternoclavicular joint)
Where does the clavicle articulate laterally?
The acromion process of the scapula (acromioclavicular joint)
Why do humans have clavicles?
- To be a strut (for more mobility of upper limb)
2. Breakable link (due to curved nature) to protect damage to sternoclavicular joint
How do you differentiate the medial and lateral end of the clavicle?
Medical end is bulbous for articulation. Lateral end is flattened in transverse plane.
How do you differentiate posterior and anterior on the clavicle?
The anterior medial side is convex and the lateral anterior side is concave
How do you differentiate the clavicle form superior to inferior?
Superiorly the clavicle is smooth and inferiority the clavicle has lots of bony grooves and protuberances for attatchment
What attaches to the costal tuberosity?
The costoclavicular ligament
What attatches to the subclavian groove?
The subclavius muscle (function is to depress the clavicle)
What attaches to the conoid tubercle?
The conoid ligament
What attaches to the trapezoid line?
The trapezoid ligament
What two joints does the clavicle articulate with?
The sternoclavicular joint (m) and the acromioclavicluar joint (l)
What are the 3 borders of the scapula?
Lateral - axillary
Medial - vertebral
Superior
What are the three angles of the scapula?
Superior angle
Inferior angle
Lateral angle
What are the 3 processes of the scapula?
Corocoid process (lig and muscle)
Scapula spine
Acromion process
What is the name of the anterior side of the scapula and what joint does it form?
Costal side - forms the scapulothoracic joint
What is the name of theposterior side of the scapula and what joint does it form?
The dorsal side -
What is the name of the flattened depression on costal side of the scapula? What muscle attaches here?
The subscapula fossa. The subscapularis
What muscle attaches to the robust medial side of the costal scapula?
The serratus anterior muscle
What is the name of the two fossae on the dorsal side of the scapula?
The supraspious and infraspinous fossae
Which muscles have their medial attachment at the supraspinous and infraspinous fossae?
The supraspinatus muscle and the infraspinatus muscle
What is the purpose of the spinoglenoid notch?
Communication between supraspinous and infraspinous fossae
Where is the suprascapular notch located and what passes through here?
The superior surface of scapula and suprascapula nerve, suprascapular artery and the suprascapular vein
What muscles attach to the supraglenoid and infraglenoid tubercles?
The biceps brachii and the triceps brachii respectively
What is the name of the junction between proximal epiphysis and the proximal metaphysis?
The anatomical neck
What is the name of the junction between the proximal metaphysis and the proximal diaphysis?
The surgical neck
What proportion of the humeral head articulations surface is in direct contact with the glenoid fossa?
1/3
Which muscles attach to the greater tubercle facets?
Rotator cuff muscles
Sup - supraspinatus
Mid - infraspinatus
Inf - teres minor
Which muscles attach to the lesser tubercle?
Subscapularis
What is the name of the groove between the greater and lesser tubercles?
Intertubercular groove
Which tendon is stabilised between the greater and lesser tubercle?
The biceps brachii tendon
What is the name of the v shaped tuberosity in the mid shaft of the humerus? What muscle attaches here?
Deltoid tuberosity. The deltoid muscle
What are the flared portions of bone proximal to the humeral condyles called?
The medial and lateral supracondylar ridges
What is the larger epicondyle?
Medial
What is the joint between the trochlea and the ulna?
Humeroulna joint
What does the head of the radius articulate with?
Capitulum
What are the names of the 3 fossae on the distal side of the radius?
Coronoid
Radial
Elecronon
