Olecranon fossa (Fossa olecrani) is a prominent, triagular-shape depression on the distal posterior surface, superior to the trochlea. This area accepts the olecranon process of the ulna when the forearm is extended.
Where does the olecranon process of the ulna go when the forearm extended in the elbow joint?
this notch is called the olecranon process; it articulates behind the humerus in the olecranon fossa and may be felt as the point of the elbow. The projection that forms the lower border of the trochlear notch, the coronoid process, enters the coronoid fossa of the humerus when the elbow...
What attaches to olecranon process?
The olecranon (previously the olecranon process) of the ulna is the most proximal part of the bone. It is a massive, blunt process. The triceps brachii muscle , the primary extensor of the forearm, has its insertion on the tuberosity of this process.
What bone is the olecranon process on?
The olecranon is the part of the ulna that “cups” the lower end of the humerus, creating a hinge for elbow movement.
What bone articulates with the olecranon fossa?
On the posterior surface of the condyle is the olecranon fossa, which articulates with the olecranon of the ulnar bone upon flexion of the elbow joint.
When the elbow is fully extended where with reference to the humerus is the olecranon process found?
Structure. The olecranon fossa is located on the posterior side of the distal humerus . The joint capsule of the elbow attaches to the humerus just proximal to the olecranon fossa.
What is elbow flexion and extension?
When your forearm moves toward your body by bending at your elbow, it’s called elbow flexion. The opposite movement is called elbow extension .
Which structure is proximal to the olecranon?
Olecranon Fractures
The most proximal aspect of the olecranon articulates with the olecranon fossa of the distal humerus posteriorly and the coronoid process articulates with the coronoid fossa of the humerus anteriorly.
What does the olecranon of ulna articulate with?
The olecranon forms the upper part of the semi-lunar notch which is a smooth, large depression and articulates with the humeral trochlea during elbow flexion and extension.
Where is the olecranon process located quizlet?
The olecranon process is located on the medial aspect of the ulna . In the anatomical position, the tuberosity of the radius is in close proximity to the lateral side of the ulna.
Is olecranon fossa the elbow?
The two depressions—the olecranon fossa, behind and above the trochlea, and the coronoid fossa, in front and above—receive projections of the ulna as the elbow is alternately straightened and flexed.
What does the trochlea articulate with?
The capitulum laterally articulates with the radius; the trochlea, a spool-shaped surface, articulates with the ulna .
What bone is above the elbow?
The humerus is the upper arm bone between the shoulder and the elbow. The radius is one of the forearm bones between the elbow and wrist. The radius is on the “thumb side” of the forearm. The ulna is the other forearm bone between the elbow and wrist, running next to the radius.
What rests in a fossa of the humerus when the forearm is extended?
DURING flexion of the forearm the coronoid fossa of the humerus receives the coronoid process of the ulna. On the posterior surface above the trochlea is a deep triangular depression, the olecranon fossa , in which the summit of the olecranon is received in extension of the forearm.
What structures limit the extension of the forearm?
LIMITATIONS OF MOTION
Supination of the forearm is limited by tension in ligamentous structures ( anterior radioulnar ligament and oblique cord ).
Which structure is located on the medially on an AP elbow projection?
It articulates with the radius and ulna bones of the forearm to form the elbow joint. Distally, the humerus becomes flattened. The prominent bony projection on the medial side is the medial epicondyle of the humerus . The much smaller lateral epicondyle of the humerus is found on the lateral side of the distal humerus.
What structure and bone articulates with the trochlea of the humerus?
The upper end of the ulna presents a large C-shaped notch— the semilunar, or trochlear, notch —which articulates with the trochlea of the humerus (upper arm bone) to form the elbow joint.
What does elbow flexion involve?
During elbow flexion the forearm is moved toward the upper arm rotating around the elbow joint center. Pronation and supination are performed by radius and ulna crossing each other and so rotating forearm and hand to a maximum of 90° from neutral hand position.
What is extension of the elbow?
Extension of the elbow refers to straightening the forearm by widening the angular distance between the hand and the shoulder from a flexed position . ... In non-medical terms, this means that a person straightens his or her arm so that the elbow joint is open and not bent.
How is elbow extended?
The annular ligament of the elbow extends from the ulna around the head of the radius to hold the bones of the lower arm together. These ligaments allow for movement and stretching of the elbow while resisting dislocation of the bones.
What muscles attaches to the olecranon?
Description. The olecranon is a bony prominence of the ulna that represents that bone’s most proximal posterior surface at the elbow. While the olecranon is an attachment site for several muscle groups including the flexor carpi ulnaris and anconeus, the major muscle attachment is that of the triceps .
Is the medial epicondyle proximal or distal?
| Medial epicondyle of the humerus | FMA 23441 | Anatomical terms of bone |
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What is the proximal process of the ulna?
The proximal ulna consists of the olecranon process posteriorly and the coronoid process anteriorly . The articulating surface of the proximal ulna is covered with cartilage, except for a bare area that separates the olecranon from the coronoid.
Which structure articulates with the Trochlea quizlet?
The trochlea of the humerus articulates with the trochlear notch of the ulna .
What structures do the olecranon fossa Trochlear notch and Coronoid fossa of the humerus articulate with on the ulna?
This region contains two bones, the ulna medially and the radius on the lateral (thumb) side. The elbow joint is formed by the articulation between the trochlea of the humerus and the trochlear notch of the ulna, plus the articulation between the capitulum of the humerus and the head of the radius.
Which of the following is the elbow?
| Type Hinge joint | Mnemonics CRAzy TULips (Capitulum = RAdius, Trochlea = ULna) |
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Which of the following muscles performs flexion of the thumb?
The flexor digitorum superficialis and the flexor digitorum profundus are finger flexors, and the flexor pollicis longus is a thumb flexor.
What muscle is above the elbow?
The triceps tendon is a tough, flexible tissue that attaches the triceps muscle at the back of the upper arm to the elbow bone. It helps triceps muscles to straighten your arm. Repeated strain on a tendon can cause tiny micro-tears in the tissue.
Which bones make up the upper limbs?
In this section, learn more about the anatomy of the bones of the upper limb – the clavicle, scapula, humerus, radius, ulna and hand bones .
Where is the ulnar notch located quizlet?
Where is the ulnar notch located? The medial aspect of the shaft of the distal radius forms a concavity, the ulnar notch.
When the arm is held in the anatomical position the radial tuberosity is in close proximity to lateral side of the ulna?
When the arm is held in the anatomical position the radial tuberosity is in close proximity to lateral side of the ulna. The insertion of the biceps brachii muscle is the radial tuberosity. The radial collateral ligament provides lateral stability to the elbow and is rarely injured.
What bones are involved in the elbow joint?
The elbow is a complex joint formed by the articulation of three bones – the humerus, radius and ulna . The elbow joint helps in bending or straightening of the arm to 180 degrees and assists in lifting or moving objects. The bones of the elbow are supported by: Ligaments and tendons.
How do you identify an olecranon?
The olecranon is situated at the proximal end of the ulna , one of the two bones in the forearm. When the hand faces forward (supination) the olecranon faces towards the back (posteriorly).
When the elbow is flexed the trochlea articulates with the?
Anatomical terms of bone
In the human arm, the humeral trochlea is the medial portion of the articular surface of the elbow joint which articulates with the trochlear notch on the ulna in the forearm.
Which of the following structures forms the point of the elbow?
The upper end of the ulna also has two protrusions – the olecranon , which forms the point of the elbow, and the caronoid process.
Is the trochlea anterior or posterior?
The medial portion of the articular surface of distal humerus is named the trochlea, and presents a deep depression between two well-marked borders; it is convex from before backward, concave from side to side, and occupies the anterior, lower, and posterior parts of the extremity.
Which fossa are found on the anterior side of the humerus?
Coronoid Fossa (Fossa coronoidea) is a depression located superior to the anterior aspect of the trochlea.
Where is radial fossa of humerus?
The radial fossa is a slight depression found on the humerus above the front part of the capitulum . It receives the anterior border of the head of the radius when the forearm is flexed.
What are the anatomical structures at the proximal end of humerus?
Proximal end. The proximal end of the humerus consists of a head, an anatomical neck and the greater and lesser tubercles .
