Week 8 - The humerus Flashcards
What does the humerus articulate with?
Scapula
Radius
Ulna
Where does the humerus articulate with the scapula?
At the glenohumeral joint
Where does the humerus articulate with the radius and ulna?
At the elbow joint
What does the proximal end of the humerus have?
Head Surgical neck Anatomical neck Greater tubercle Lesser tubercle
What does the spherical head of the humerus articulate with?
The glenoid cavity of the scapula
What is the anatomical neck of the humerus formed by?
The groove circumscribing the head and separating it from the greater and lesser tubercles
What does the anatomical neck of the humerus indicate the line of?
The glenohumeral joint capsule
What is the surgical neck of the humerus?
The narrow part distal to the head and tubercles
What indicates the junction of the head and neck with the shaft of the humerus?
The greater and lesser tubercles
What do the greater and lesser tubercles provide attachment and leverage for?
To some scapulohumeral muscles
Where is the greater tubercle?
At the lateral margin of the humerus
Where is the lesser tubercle?
Projects anteriorly from the bone
What is the intertubercular sulcus also known as?
The bicipital groove
What does the intertubercular sulcus do?
Separates the tubercles and provides protected passage for the slender tendon of the long head of the biceps muscle
What are the two prominent features of the shaft of the humerus?
The deltoid tuberosity, laterally
The oblique radial groove, posteriorly
What is the deltoid tuberosity for?
Attachment of the deltoid muscle
What lies in the radial groove for?
The radial nerve and profunda brachii artery
what forms when the inferior end of the shaft widens?
The sharp medial and lateral supraepicondylar ridges
Where do the medial and lateral supraepicondlyar ridges end?
Distally in the especially prominent medial epicondyle and lateral epicondyle, providing for muscle attachment
What makes up the condyle of the humerus?
Trochlea Capitilum Olecranon Coronoid Radial fossae
What are the two articular surfaces of the condyle?
A lateral capitulum
A medial trochlea
What does the lateral capitilum articulate with?
The head of the radius
What does the medial trochlea articulate with?
The proximal end of the ulna
What occur back to back superior to the trochlea?
Two fassae, which makes the condyle quite thin between the epicondyles
What does the coronoid fossa receive during full flexion of the elbow?
The coronoid process of the ulna
What does the olecranon fossa accommodate during full extension of the elbow?
The olecranon of the ulna
What does the shallower radial fossa accommodate when the forearm is fully flexed?
The edge of the head of the radius
