Where is the olecranon fossa located on the elbow?
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. The olecranon fossa provides space for the olecranon of the ulna during extension of the forearm, from which it gets its name.
What is the difference between olecranon fossa and coronoid fossa?
The olecranon fossa is a deep hollowed area on the posterior surface, superior to the trochlea. In elbow extension, the tip of the ulnar olecranon process lodges into this fossa. The coronoid fossa is a smaller hollow that is also located superior to the trochlea, but on the anterior surface.
Where does the lateral border of the humerus end?
The lateral border of the humerus ends at the lateral epicondyle. There is an impression on the lateral and anterior surfaces where the seven muscles of the superficial group of the posterior compartment of the forearm originate. These include the: The olecranon fossa is a deep hollowed area on the posterior surface, superior to the trochlea.
Is the humerus distal to the elbow?
Humerus. Also, the humerus has distal articulations with the radius and ulna at the elbow joint . The nature of the elbow joint enables the movements that are limited to the arm and forearm, and cannot be performed within the other parts of the body, such as supination and pronation.
Where on the humerus is the olecranon fossa located?
The olecranon fossa is located on the posterior surface of the distal humerus, where it receives the proximal ulna during full extension of the arm.
Where is olecranon located?
elbowThe olecranon is a large bony prominence at the proximal end of the ulna. It is palpable at the posterior aspect of the elbow.
Which fossa are found on the anterior side of the humerus?
The coronoid fossa is the medial hollow part on the anterior surface of the distal humerus. The coronoid fossa is smaller than the olecranon fossa and receives the coronoid process of the ulna during maximum flexion of the elbow.
Where is the olecranon fossa located quizlet?
The olecranon fossa, found on the humerus, works together with the olecranon process, found on the ulna, to help extend the forearm.
How do you tell a right humerus from left?
The side on which the capitulum faces determines the bone side. If the capitulum is facing the right side or is present on the right side of the bone then it is the right humerus bone. If the capitulum is present on the left side of the bone then it is the left humerus bone.
What bone does the olecranon fossa belong to?
The olecranon fossa is a deep triangular depression on the posterior side of the humerus, superior to the trochlea. It provides space for the olecranon of the ulna during extension of the forearm.
Which fossa are found on the anterior side of the humerus quizlet?
this process is superior to the trochlear notch and fits into the olecranon fossa of the humerus. located on the anterior portion of the ulna, it is an extensions of the trochlear notch.
What is proximal to the humerus?
The most proximal portion of the humerus is the head of the humerus, which forms a ball and socket joint with the glenoid cavity on the scapula. [1] Just inferior to the head of the humerus is the anatomical neck of the humerus, which divides the head of the humerus from the greater and lesser tubercles.
What is located anteriorly on the distal end of the humerus?
Immediately lateral to the trochlea is the capitulum (“small head”), a knob-like structure located on the anterior surface of the distal humerus. The capitulum articulates with the radius bone of the forearm.
Is the olecranon process located on the medial aspect of the ulna?
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. The insertion of the biceps brachii muscle is on the tuberosity of the radius and bicipital aponeurosis.
On which bone is the olecranon process found what is its purpose?
The proximal end of the ulna which forms the tip of the elbow is called the Olecranon process. This process is the site of attachment of the tricep muscle tendons. Its contraction is involved in elbow straightening. It also forms a portion of the joint surface of the elbow.
What is olecranon process quizlet?
Olecranon process. (Elbow) Location. Proximal end of the ulna and articulates with the distal humerus. Its large surface is the attachment site for the triceps brachii muscle.
What is the olecranon in anatomy?
The olecranon is a large, thick, curved eminence, situated at the upper and back part of the ulna. It is bent forward at the summit so as to present a prominent lip which is received into the olecranon fossa of the humerus in extension of the forearm.
Is the olecranon the elbow?
An olecranon (oh-LEK-rah-nun) fracture is a break in the bony "tip" of the elbow. This pointy segment of bone is part of the ulna, one of the three bones that come together to form the elbow joint. The olecranon is located under the skin of the elbow, without much protection from muscles or other soft tissues.
What is the olecranon?
Elbow (Olecranon) Bursitis. Elbow bursitis occurs in the olecranon bursa, a thin, fluid-filled sac that is located at the boney tip of the elbow (the olecranon). There are many bursae located throughout the body that act as cushions between bones and soft tissues, such as skin.
What is the common name for olecranon?
Olecranon: The bony tip of the elbow.
Where is the anterior border of the humerus?
The lateral border begins just distal to the greater tubercle of the humerus.
Which part of the humerus is the most lateral?
The greater tubercle is the most lateral portion of the proximal end of the humerus. It consists of three smooth and flat impressions at the posterosuperior aspect for the attachment of muscles. From superior to inferior, the muscles that attach at these impressions are the: supraspinatus. infraspinatus.
What is the intertubercular sulcus?
The intertubercular sulcus is an indentation located between the two tubercles. It is sometimes referred to as the bicipital groove. The long tendon of the biceps brachii and an ascending branch of the anterior circumflex humeral artery are located within the sulcus. The sulcus consists of a lateral lip and a medial lip. The tendon of the pectoralis major muscle attaches on to the lateral lip (a.k.a. crest of greater tubercle), while the teres major tendon attaches on to the medial lip. In addition, the tendon of lattisimus dorsi attaches to the posterior aspect.
What is the humerus articulation?
The humerus articulates with the scapula proximally at the glenohumeral joint so it participates in the movements of the shoulder . Also, the humerus has distal articulations with the radius and ulna at the elbow joint .
Where is the anteromedial surface located?
The anteromedial surface is located between the anterior and medial borders of the shaft/body, beginning proximally at the floor of the intertubercular sulcus. It provides attachment for the coracobrachialis muscle around its mid-portion, while the distal half of the surface is largely covered by the medial portion of the brachialis muscle.
Where is the lesser tubercle located?
The lesser tubercle is located anterior to the anatomical neck and has a smooth, palpable muscular impression. The lateral part forms the medial margin of the intertubercular sulcus. The subscapularis muscle attaches at this tubercle and the transverse ligament of the shoulder also attaches on its lateral part.
What is the proximal end of the humerus?
The proximal end of the humerus consists of a head, an anatomical neck and the greater and lesser tubercles.
What is the olecranon fossa?
A small cavity, called the olecranon fossa, located on the posterior side of the humerus, locks the tip of the ulna (alternatively known as the olecranon) into the bone. This locking prevents the extension of the elbow beyond 180 degrees. Despite this, the distal portion of the humerus also contains two other depressions, known as the coronoid and radial fossae. They lodge the forearm bones during flexion or extension of the elbow.
Where is the humerus located?
The humerus is located in the upper arm, between the shoulder joint and the elbow joint.
What is the shape of the humerus?
Head: The proximal end of the humerus forms a smooth, spherical structure known as the head. It forms the ball-like region of the ball-and-socket shoulder joint, with the glenoid cavity of the scapula acting as the socket. The head faces medially, upwards, and backward. Its round shape allows it to move in a complete circle and rotate around its axis at the shoulder joint.
What is the groove in the posterior humerus called?
A shallow depression called the radial (or spiral) groove , runs diagonally down the posterior surface of the humerus, parallel to the deltoid tuberosity. This groove contains the radial nerve and profunda brachii artery.
How many bones are there in the humerus?
The adult humerus develops from three bones in the fetus: two epiphyses that form the end caps of the bone and a diaphysis, or central shaft. A thin layer of hyaline cartilage, called the epiphyseal plate or growth plate, exists between these three bones. Cartilage in the epiphyseal plate grows throughout childhood and adolescence to elongate the humerus, thus helping the arm’s growth.
Which part of the humerus is the trochlea?
The lower end of the humerus is the distal humerus, containing two joint-forming processes, the capitulum, and the trochlea. Towards the center of the arm, the trochlea tightly hinges with the ulna of the forearm, forming half of the elbow joint. On the other hand, the convex capitulum articulates with the concave head of the radius on the lateral side of the arm. The joint thus formed allows the forearm and hand to rotate and bend at the elbow.
Which part of the humerus articulates with the glenoid cavity?
Proximally: The proximal portion of the humerus articulates with the glenoid cavity or glenoid fossa of the scapula, forming the shoulder (or glenohumeral) joint.
